Grinding Wheel Knowledge Base

Custom Grinding Wheel Shapes: Type 1 vs Type 5 vs Type 7

A custom grinding wheel shape is a mounting decision before it is a performance decision. Type 1, Type 5 and Type 7 all present a peripheral grinding face, but they differ in what happens around the bore: no recess, one recess, or two. That difference controls flange clearance, working orientation and whether the wheel can be mounted safely on the machine in front of you.

Type 1: straight body with flat sides and no recess

Type 5: one flat side and one side recessed around the bore

Type 7: both sides recessed around the bore

Equal outside diameter, thickness and bore do not make the three shapes interchangeable

Overview

Quick answer: confirm the mounting interface, not only the outline

Type 1, Type 5 and Type 7 are conventional bonded grinding wheel body shapes used for peripheral grinding. In ISO shape terminology, Type 1 is a straight wheel; Type 5 is a wheel recessed on one side; Type 7 is a wheel recessed on both sides. The recess is a relief around the bore on a side face. It is not the grinding face, and it does not change the outside diameter or the peripheral working surface.

The recess exists so a flange, nut or spindle shoulder can clear the wheel while the flange still seats on a defined flat annulus. A Type 5 wheel is used where clearance is needed on one side. A Type 7 wheel provides clearance on both sides, which is why it is commonly associated with wider wheels mounted between flanges. The exact recess diameter P and recess depth F — plus G on the second side of a Type 7 — are part of the wheel geometry and must be on the drawing.

Shape alone does not choose the abrasive, grit, grade, structure or bond. A Type 1 and a Type 7 wheel of the same dimensions can be supplied in different specifications, and the same shape can behave differently when the material, contact area, coolant, dressing method or machine changes. Shape answers a fit and clearance question; the specification answers a grinding-behaviour question. Both have to be reviewed together.

The useful output of this page is a complete geometry record. Confirm the type number, the working face, which side is recessed, D, T, H, P, F and G, the flange and guard interface, the bore fit, the wheel marking and the machine's maximum speed. A photograph is useful evidence, but it cannot replace a dimensioned drawing or verified measurements.

What to establish before choosing a shape

Start with the existing wheel, machine, flange and guard — not with a shape name.
A recess is a clearance feature around the bore; it is not a coolant channel or a second grinding face.
Write the type number and every recess dimension on the drawing; D × T × H alone is incomplete for Type 5 and Type 7.
Match the working face and recess side to the spindle, flange and nut arrangement before ordering.
A wheel that fits is not automatically safe: verify maximum operating speed, bore fit, flange contact, balance and guard clearance.

Type 1, Type 5 and Type 7: what each shape actually is

The three type numbers describe the side profile of a peripheral grinding wheel. They do not describe its abrasive or bond, and they are not grades of quality.

Type 1 — straight wheel

A straight wheel has a flat side profile with no recess around the bore. Its basic dimensions are outside diameter D, thickness T and bore H. When both flanges can contact the flat sides correctly, it is the simplest body to mount and the easiest geometry to describe. Type 1 covers a wide range of surface, cylindrical and toolroom applications, but the name alone does not confirm that a particular wheel suits a particular machine.

Type 5 — wheel recessed on one side

A Type 5 wheel has one flat side and one side recessed around the bore. The recess has a diameter P and a depth F. It provides clearance for a flange, nut or spindle shoulder so a wider wheel can be mounted where the available mounting thickness is less than the full wheel thickness. Which side is recessed, and which side presents the grinding face, must be confirmed from the drawing and the machine arrangement.

Type 7 — wheel recessed on both sides

A Type 7 wheel is recessed around the bore on both sides. The two recess depths are commonly identified as F and G, and each must be confirmed separately. This body provides flange clearance on both sides and is commonly used for wider wheels mounted between flanges. It is a different mounting geometry from Type 5, not a Type 5 with an extra groove.

The recess does not grind

A recess is a relief on a side face, close to the bore. It does not become the peripheral working face and it does not create cutting edges. The outer cylindrical surface remains the grinding surface in normal peripheral operation. Any side grinding or face grinding would require a different wheel type and a separate application review.

Recessed is not the same as relieved, dished or cup-shaped

Recessed wheels (Type 5 and Type 7) should not be confused with relieved wheels, dish wheels, cup wheels or other shape families. Similar photographs can hide a different side profile, a different working face or a different mounting interface. The type number, section drawing and working face must agree.

Section comparison of Type 1 straight, Type 5 single-recess and Type 7 double-recess grinding wheels — The recess is a clearance feature around the bore. The outer periphery remains the grinding face.

Single recess vs double recess: what changes and what does not

Single recess and double recess describe where clearance is provided. They do not automatically describe wheel quality, stiffness, cutting behaviour or precision.

Single recess provides clearance on one side

Type 5 is selected when the flange, nut or spindle shoulder needs room on one side while the opposite side presents a flat face or the grinding position. The wheel must be oriented correctly: putting the recess on the wrong side can lose the intended clearance or change how the flange seats.

Double recess provides clearance on both sides

Type 7 is selected when flanges or mounting features on both sides need clearance. It allows a wide wheel to be mounted between flanges while each flange bears on a defined recessed seat rather than on the full side face. F and G can be equal or different according to the drawing; do not assume symmetry.

Recess diameter and depth are a matched pair

A recess that is wide enough but too shallow may not clear the flange or nut. A recess that is deep enough but too small in diameter may not accept the flange. The flange must seat on the intended annulus without bottoming in the recess, and the recess must not leave an inadequate hub section.

The working face and the recess side must be stated

A side-view drawing can look symmetrical while the wheel is not. Mark the grinding face, the mounting face, the recessed side or sides, and the direction of rotation where the machine requires it. For a Type 7 wheel, mark F and G and identify which is which.

Do not choose double recess merely to look stronger

Type 7 is not a universal upgrade over Type 5 or Type 1. It solves a two-side clearance problem. If the machine has a flat flange on one side and no need for relief there, the extra recess may add manufacturing complexity without solving a real mounting constraint. The correct shape is the one that matches the verified interface.

Mounting clearance, flange geometry and bore fit

The wheel drawing and the machine interface have to be reviewed together. A wheel can be dimensionally correct on its own and still be impossible to mount correctly on a particular spindle.

Flange contact area

The flange should bear on a flat, clean annulus of the wheel. On a Type 1 wheel this is normally the flat side face. On Type 5 and Type 7 wheels the flange may sit within the recess. Confirm the flange outside diameter, the recess diameter P and the annular contact width rather than assuming that any flat surface will do.

Flange and nut height versus recess depth

The recess must be deep enough for the flange, nut or spindle shoulder that enters it. At the same time, the flange must still clamp the wheel correctly and must not bottom out before contact is established. Check F and G against the actual mounting hardware, not only against a catalogue outline.

Bore fit and bushing

The bore H locates the wheel on the spindle or bushing. Confirm the nominal bore, the fit or tolerance where specified, and whether a bushing is permitted. The wheel must not be forced onto the spindle, and an excessively loose bore is not corrected by over-tightening the flange. Bushings must be correct for the wheel and must not protrude into the flange contact area.

Blotters, flange condition and clamping

Where the wheel and machine instructions require blotters, they belong between the wheel and each flange. Flanges should be flat, clean, undamaged and matched. Tighten only as specified by the wheel and machine manufacturer; over-tightening can distort a flange or damage the wheel. Follow the manufacturer's mounting instructions and the applicable safety requirements.

Guard, speed and machine envelope

A recess changes the side profile and can change how the wheel sits relative to the guard, coolant nozzle, fixture and workpiece. Confirm that the guarded machine can accept the wheel and that the spindle speed cannot exceed the wheel's marked maximum operating speed. Balance the wheel as required and stand clear during the initial run-in with the guard in place.

Dimensioned section of Type 5 and Type 7 wheel recesses with flange, blotter, spindle and bore-fit callouts — The flange must seat on the intended annulus, the recess must clear the mounting hardware, and the bore must locate without forcing.

How to read and confirm a custom grinding wheel drawing

A drawing is useful only when it states the geometry that controls fit. For recessed wheels, a front view plus three numbers is not enough.

Read the designation from the type number outward

Start with the ISO or drawing type number: Type 1, Type 5 or Type 7. Then read the dimensions in a consistent order: outside diameter D, thickness T and bore H. For Type 5, add recess diameter P and depth F. For Type 7, add P and both depths F and G. Confirm units and drawing revision before using any value.

Use a section view to establish the side profile

A section through the bore shows whether the sides are flat, where the recess begins, how deep it is and how much hub remains. A front view alone cannot establish recess depth or side orientation. Mark radii, chamfers, reliefs and any feature that controls flange seating.

Separate nominal values from measured values

If the drawing is unavailable and the wheel is being measured, label every value as measured. A used wheel may have lost outside diameter through wear and dressing. Its current recess may no longer represent the original geometry. Do not present a worn measurement as the original specification.

Check the working face and balance of the drawing

The drawing should identify the grinding face, the mounting faces, the recessed side or sides and, where relevant, the direction of rotation. It should also state the wheel specification, maximum operating speed and any balance or run-out requirement. A drawing that shows only the outline is an identification sketch, not a manufacturing drawing.

Resolve conflicting sources before ordering

When the wheel marking, the drawing, the machine manual and the existing wheel disagree, stop and resolve the conflict. Do not choose the most convenient value. Photograph the wheel, the marking, the flange arrangement and the machine spindle interface, then send all of them with the drawing revision.

Standards and drawing language: what a type number does and does not tell you

Standards make the drawing readable across suppliers. They do not replace the actual wheel drawing, the machine instructions or the applicable safety requirements.

ISO 525:2020 — shape types, designation and marking

ISO 525 defines bonded abrasive shape types, dimensional symbols, standard profiles, designation and marking. It is the reference that makes 'Type 5, D × T × H – P × F' understandable across drawing systems. It does not by itself establish that a particular size or specification is available.

ISO 603-1 and ISO 603-4 — dimensions for grinding wheels

ISO 603-1 covers grinding wheels for external cylindrical grinding between centres; ISO 603-4 covers grinding wheels for surface grinding. Both use the Type 1, Type 5 and Type 7 shape language. The applicable part and the customer drawing determine the actual dimensions and permissible combinations.

Related tolerance, balance and safety references

ISO 13942 covers limit deviations and run-out tolerances; ISO 6103 covers permissible unbalance of bonded abrasive products. EN 12413:2019 sets safety requirements for bonded abrasive products in Europe. In the United States, ANSI B7.1 provides safety requirements for the use, care and protection of abrasive wheels. Confirm which requirements apply to the destination and machine.

The drawing remains the controlling document

A type number is a classification, not a complete order. The drawing revision, dimensions, tolerances, specification, marking, maximum operating speed and special notes control the wheel. Where the standard and the drawing differ, resolve the difference with the wheel manufacturer before manufacture.

Shape selection for surface and cylindrical grinding

Surface grinding and cylindrical grinding create different mounting and clearance situations, but neither operation chooses the shape by name alone.

Surface grinding with a horizontal spindle

The wheel usually grinds with its periphery against a flat surface on a reciprocating or rotary table. A Type 1 straight wheel is the normal starting point when both sides can be flanged cleanly and the wheel width is compatible with the machine. A Type 5 or Type 7 wheel may be considered where a wider wheel or a particular flange and nut arrangement requires recess clearance.

External cylindrical grinding

The wheel grinds the outside diameter of a rotating workpiece. Wheel width, workpiece length, traverse or plunge strategy and the flange assembly all affect the body choice. Type 1 remains common; Type 7 is commonly encountered where a wider wheel must sit between flanges with relief on both sides. The machine spindle and wheel head envelope still control the final fit.

Clearance around the wheel, not only through the bore

The recess may clear a flange, but the wheel still has to clear the guard, coolant nozzle, workpiece fixture and machine structure. Check the whole rotating envelope. A side recess does not create clearance at the periphery or guarantee access to a confined grinding position.

Do not import a shape from another machine

A wheel that works on one grinder is not automatically suitable for another with the same nominal spindle size. Flange diameter, flange recess, nut height, spindle shoulder, guard design and speed limit can all differ. Reconfirm the interface even when the two machines look similar.

Abrasive, bond, dressing and grinding conditions

The body shape establishes fit and clearance. The abrasive system and the grinding conditions establish how the wheel behaves once it is correctly mounted.

Conventional abrasives for conventional bonded wheels

Aluminium oxide and silicon carbide are the usual conventional abrasive families for the wheels discussed here. Aluminium oxide is commonly reviewed for ferrous work; silicon carbide is commonly reviewed for cast iron, non-ferrous materials and some non-metallic work. These are starting directions, not universal assignments. The material, condition and operation must be stated before a specification is proposed.

Bond and wheel structure

Vitrified bond is widely used for precision conventional wheels because it can provide a rigid body and a dressable cutting face. Resin, rubber and other bonds have different characteristics and may suit different operations. Grade, structure and bond affect how the wheel holds form, how freely it cuts and how it responds to dressing. They are separate from the Type 1/5/7 body shape.

Recess geometry and manufacturability

A drawing can describe a recess that is difficult or unsuitable to manufacture in a particular bond, diameter and thickness. Sharp internal corners, a deep recess, a thin remaining hub or a non-standard side profile may require design review. Not every combination is available, and a request is not confirmed until the manufacturer has reviewed the drawing.

Grit, grade and structure do not correct mounting problems

A finer grit may change surface texture but cannot correct an out-of-flat condition, a flange that does not seat or a wheel that contacts the guard. A softer grade may change how the wheel breaks down but cannot create clearance. Resolve fit and mounting first, then review the grinding specification.

Dressing and truing

Dressing restores the cutting face; truing establishes the wheel geometry. The dressing tool, method and frequency must suit the bond and the wheel shape. Do not dress a recess into a straight wheel or enlarge a recess in service. The recess is a manufactured feature, and modifying it can affect strength, balance and safety.

Grinding conditions to record

Record wheel surface speed and spindle speed, work speed, infeed or depth of cut, traverse rate, coolant type and delivery, filtration, machine rigidity, dressing practice and the required surface or tolerance result. These conditions explain why two wheels of the same shape and specification can behave differently. No outcome should be promised without a controlled trial on the actual machine.

Practical buyer decision guide

Use these conditional directions to narrow the request. Each one still requires the drawing, machine interface and safety check.

Both sides are flat and the flanges seat correctly

Start with Type 1. Confirm that the flange outside diameter, contact area, bore fit, guard clearance and speed limit are acceptable before treating the existing straight wheel as a baseline.

Clearance is needed on one side only

Evaluate Type 5. Confirm which side is recessed, the working face, P and F, the flange and nut dimensions, and whether the remaining hub is adequate. Do not reverse the wheel to make it fit.

Both flanges need clearance on a wide wheel

Evaluate Type 7. Confirm P, F and G separately, both flange seats, the mounting orientation and the machine's full rotating envelope. Do not assume the two recesses are identical.

Only D, T and H are known

Do not order a recessed wheel from those three values. Obtain a drawing or measure the recess and side orientation. If the current wheel is worn, mark the measurements as current rather than original.

The existing wheel fits but the grinding result is poor

Do not change the body shape first. Review the wheel specification, dressing, coolant, machine condition and grinding conditions. A shape change is a fit decision, not a troubleshooting shortcut.

The machine, flange or guard is unknown

Pause the order. A wheel cannot be confirmed as suitable without the mounting interface. Obtain the machine documentation, flange dimensions and guard arrangement, and verify the maximum operating speed before any trial.

Where the shape decision appears

Grinding situations where Type 1, Type 5 and Type 7 are reviewed

These are review contexts, not automatic shape assignments. The machine, flange arrangement and clearance determine whether a recess is needed.

Surface grinding with a horizontal spindle

Wheel width, flange clearance and machine envelope

Confirm how the wheel is mounted and which face is presented to the workpiece

External cylindrical grinding

Flange clearance, wheel width and spindle interface

Review Type 5 or Type 7 only against the actual flange and machine drawing

Wide wheels mounted between flanges

Both recess depths and both flange contact faces

Confirm F and G independently, including side orientation

Replacing an existing recessed wheel

Worn dimensions versus original drawing values

Obtain the current drawing revision or measure every feature and mark uncertain values

Material and specification

The body shape and the grinding specification are separate decisions

Type 1, Type 5 and Type 7 describe the wheel body and mounting geometry. They do not describe the abrasive, grit, grade, structure or bond. Review the material and the grinding behaviour on their own evidence, then combine them with the confirmed shape.

Hardened alloy and tool steels

Common in precision surface and cylindrical grinding. The same body shape can be paired with different conventional abrasive specifications, so material hardness and the required surface condition should be stated separately from the shape.

Carbon and structural steels

General engineering steels may be ground with conventional alumina-based wheels in an appropriate bond. The shape decision still follows the machine interface, not the steel grade.

Stainless steels

Stainless grades can be sensitive to heat and loading. Wheel openness, abrasive choice, cooling and dressing may need closer review, but this does not change the Type 1/5/7 geometry definitions.

Cast iron

Graphite in the structure changes chip formation and wheel loading. The recess geometry remains a mounting feature; the abrasive and structure are reviewed against the casting and the operation.

Aluminium and copper alloys

Soft non-ferrous materials can load a wheel quickly. A more open conventional specification and effective coolant may be relevant. A recess does not solve loading and must not be treated as one.

Advantages

Three rules that prevent a costly shape mistake

Most wheel-shape problems are predictable before an order is placed: an incomplete drawing, a guessed recess, or a trial that changes too many things at once.

Drawing review and wheel-shape decision flow from the existing wheel and machine to RFQ and controlled trial — Confirm geometry and mounting before changing the grinding specification or running a trial.

Type 1 vs Type 5 vs Type 7: geometry and mounting comparison

This matrix compares body geometry, clearance and drawing information. It is not a performance ranking, and it does not confirm availability or suitability for a specific machine.

Side profile

Type 1 — straight: Both sides flat; no recess around the bore
Type 5 — single recess: One flat side; one side recessed around the bore
Type 7 — double recess: Both sides recessed around the bore

Basic dimensions

Type 1 — straight: D × T × H
Type 5 — single recess: D × T × H – P × F
Type 7 — double recess: D × T × H – P × F/G

Extra geometry to confirm

Type 1 — straight: Flange contact faces and bore fit
Type 5 — single recess: Recess diameter P, depth F and recessed side
Type 7 — double recess: P, both depths F and G, and orientation of each side

Typical mounting situation

Type 1 — straight: Flanges seat on both flat sides
Type 5 — single recess: One-side flange, nut or spindle-shoulder clearance
Type 7 — double recess: Two-side flange clearance, often on a wider wheel

Working face

Type 1 — straight: Outer periphery; either side may face outward if the drawing allows
Type 5 — single recess: Outer periphery; confirm the flat side and recess side
Type 7 — double recess: Outer periphery; confirm both flange seats and recess depths

Abrasive volume near the bore

Type 1 — straight: Full body thickness at the bore region
Type 5 — single recess: Reduced by the recess on one side
Type 7 — double recess: Reduced by recesses on both sides

Main risk if copied from another wheel

Type 1 — straight: Assuming equal D/T/H proves machine compatibility
Type 5 — single recess: Reversing the wheel or using the wrong recess side
Type 7 — double recess: Assuming F and G are equal or interchangeable

Drawing information that must not be omitted

Type 1 — straight: Working face, bore tolerance, specification and maximum speed
Type 5 — single recess: P, F, recessed side, corner radii and remaining hub
Type 7 — double recess: P, F, G, both side orientations, radii and remaining hub

Safety check before use

Type 1 — straight: Flange contact, bore fit, speed, guard and balance
Type 5 — single recess: Recess clearance, flange seating, speed, guard and balance
Type 7 — double recess: Both recess clearances, both flange seats, speed, guard and balance

What the name does not tell you

Type 1 — straight: That a straight wheel suits every surface or cylindrical operation
Type 5 — single recess: That one recess automatically makes a wheel stronger or more precise
Type 7 — double recess: That two recesses make a wheel universally interchangeable

Feature	Type 1 — straight	Type 5 — single recess	Type 7 — double recess
Side profile	Both sides flat; no recess around the bore	One flat side; one side recessed around the bore	Both sides recessed around the bore
Basic dimensions	D × T × H	D × T × H – P × F	D × T × H – P × F/G
Extra geometry to confirm	Flange contact faces and bore fit	Recess diameter P, depth F and recessed side	P, both depths F and G, and orientation of each side
Typical mounting situation	Flanges seat on both flat sides	One-side flange, nut or spindle-shoulder clearance	Two-side flange clearance, often on a wider wheel
Working face	Outer periphery; either side may face outward if the drawing allows	Outer periphery; confirm the flat side and recess side	Outer periphery; confirm both flange seats and recess depths
Abrasive volume near the bore	Full body thickness at the bore region	Reduced by the recess on one side	Reduced by recesses on both sides
Main risk if copied from another wheel	Assuming equal D/T/H proves machine compatibility	Reversing the wheel or using the wrong recess side	Assuming F and G are equal or interchangeable
Drawing information that must not be omitted	Working face, bore tolerance, specification and maximum speed	P, F, recessed side, corner radii and remaining hub	P, F, G, both side orientations, radii and remaining hub
Safety check before use	Flange contact, bore fit, speed, guard and balance	Recess clearance, flange seating, speed, guard and balance	Both recess clearances, both flange seats, speed, guard and balance
What the name does not tell you	That a straight wheel suits every surface or cylindrical operation	That one recess automatically makes a wheel stronger or more precise	That two recesses make a wheel universally interchangeable

A geometry-first RFQ produces a wheel that fits

A three-number size is enough to start a catalogue search, not to define a recessed wheel. Type, working side and recess dimensions belong on the inquiry from the first message.

Type number and working face
D, T, H, P, F and G as applicable
Flange, guard and machine interface

Recess dimensions are safety-critical, not cosmetic

The recess must clear the flange or nut without preventing the flange from seating correctly. A recess that is too shallow, too small or on the wrong side can create an unsafe or unusable mounting.

Confirm flange outside diameter against recess diameter P
Confirm recess depth F and G against flange and nut height
Confirm that the remaining hub section is adequate for the design

Keep the trial to one change

If a new shape is introduced together with a new abrasive, grit and grade, the result cannot identify what caused the change. Establish fit and mounting first, then evaluate the grinding specification.

Confirm static fit and clearance before mounting
Verify speed, balance and guard with the machine documentation
Change one process variable at a time on a controlled trial

Decision checklist

A practical Type 1, Type 5 and Type 7 selection checklist

Work through the geometry and mounting items first. The grinding specification can be refined afterwards, but it cannot correct an incompatible body.

1. Identify the current wheel type from its marking, drawing or a clear side-view photograph. Do not infer Type 5 or Type 7 from the front face alone.

2. Record which side is the grinding face and which side carries the recess. For Type 7, record both recess depths and their orientation.

3. Measure or obtain D, T and H with consistent units. Mark whether each value is a drawing value or a measurement from a used wheel.

4. Add recess diameter P and recess depth F; add G for a Type 7 wheel. A three-number description is incomplete.

5. Record the flange outside diameter and thickness, the nut or spindle-shoulder clearance, and the available machine envelope.

6. Confirm the bore fit and any bushing arrangement. The wheel must locate correctly without forcing or excessive clearance.

7. Check the wheel marking and the machine spindle speed against the maximum operating speed. Never exceed the marked limit.

8. Identify the workpiece material and its condition, then review the abrasive family separately from the body shape.

9. Describe the grinding operation: surface, external cylindrical, internal, centreless or another position, including the contact area.

10. Record the wheel specification, dressing method and dressing tool condition. A recess is manufactured geometry and should not be dressed into a wheel.

11. Record coolant type, delivery and filtration, especially where the recess affects access around the flange or workpiece.

12. Start with a drawing and a mounting review before discussing a performance trial or repeating order quantity.

What to send

Custom grinding wheel RFQ checklist

A recessed wheel cannot be quoted reliably from outside diameter, width and bore alone. These items let the supplier check fit, clearance, mounting and safety before discussing specification or price.

Wheel drawing
Current revision, units, front and section views, working face and recessed side or sides
Wheel type
Type 1, Type 5, Type 7 or the exact current marking when the type is unknown
Outside diameter D
Drawing value and, where relevant, measured value with units
Width / thickness T
Overall thickness and any separate working-face width
Bore H
Nominal diameter, fit or tolerance, and any bushing requirement
Recess geometry
P, F and G where applicable, plus the side and orientation of each recess
Workpiece material
Material name, grade and condition, with hardness only when known from a drawing or measurement
Grinding operation
Surface, external cylindrical, internal, centreless or other position, including contact area and stock allowance
Machine
Manufacturer and model where available, spindle interface, flange dimensions, guard and available envelope
Speed
Machine spindle speed range and the wheel's marked maximum operating speed
Coolant
Wet or dry, coolant type, delivery method, filtration and any access issue around the flange or workpiece
Wheel specification
Abrasive, grit, grade, structure and bond exactly as marked, or the current specification record
Dressing
Tool type, method, frequency and the condition that triggers dressing
Current problem or target
Fit problem, vibration, burn, loading, finish, tolerance or another observed condition, with location
Quantity
Trial quantity, expected repeat demand and whether a drawing or sample is supplied
Destination and application context
Country of use and the applicable machine or safety requirements when known

Send these details through the inquiry form, or contact us on WhatsApp for a preliminary recommendation.

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Industrial context

Where conventional bonded wheel geometry is specified

The same three shapes appear across precision manufacturing. The industry name does not select the shape; the machine, flange, wheel width and clearance do.

General precision machining

Toolrooms and tool grinding

Automotive component manufacturing

Bearing and hydraulic component grinding

Roll and cylinder grinding

FAQ

Frequently asked questions about Type 1, Type 5 and Type 7 wheels

Direct answers for buyers and engineers confirming conventional bonded wheel geometry before an RFQ.

What is the difference between Type 1, Type 5 and Type 7 grinding wheels?

Type 1 is a straight wheel with flat sides and no recess. Type 5 is recessed on one side around the bore. Type 7 is recessed on both sides around the bore. All three normally grind on the outer periphery. The recess provides clearance for flanges, nuts or spindle shoulders; it is not the grinding face.

Can I replace a Type 1 wheel with a Type 5 or Type 7 wheel if the outside diameter, thickness and bore are the same?

No, not from those three dimensions alone. A Type 5 or Type 7 wheel may not present the same flange contact, working face or side clearance, and its recess may not clear the machine hardware. Confirm the full drawing, mounting orientation, flange and nut dimensions, bore fit, balance, guard clearance and maximum operating speed before deciding that a substitution is possible.

What does the recess on a grinding wheel do?

The recess is a relief around the bore on a side face. It allows a flange, nut or spindle shoulder to clear the wheel while the flange seats on a defined annulus. It can allow a wider wheel to be mounted where the available mounting thickness is less than the full wheel thickness. It does not create cutting edges and is not a coolant channel.

How are recess dimensions written on a grinding wheel drawing?

The usual designation adds the recess diameter P and depth F to the basic dimensions, giving D × T × H – P × F for Type 5. For Type 7, both depths are shown as F/G. The drawing should also identify the recessed side or sides, working face, radii, tolerances, wheel specification and maximum operating speed. Units and drawing revision must be stated.

Is Type 7 better than Type 5 for cylindrical grinding?

There is no universal ranking. Type 7 provides clearance on both sides and is commonly used on wider wheels mounted between flanges, but Type 5 or Type 1 may be correct where only one side needs clearance. The machine, flange arrangement, wheel width, guard and spindle interface decide the fit. The grinding specification is a separate decision.

Can a straight wheel be recessed later or modified to fit?

No. Do not modify, cut or relieve a bonded grinding wheel to create a recess. The recess is manufactured geometry that affects strength, balance and mounting. Order the correct Type 5 or Type 7 drawing from the wheel manufacturer instead, and have the mounting interface reviewed.

What information is needed for a custom vitrified grinding wheel quote?

Provide the current drawing revision, wheel type, D, T, H, P, F and G as applicable, the working face and recessed side, workpiece material and condition, grinding operation, machine and flange details, spindle speed and wheel maximum operating speed, coolant, dressing method, current specification, the problem or target, and the required quantity. A section-view drawing is more useful than a photograph alone.

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