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3M 28403 Instruction Manual

28405

Made by: 3M
Type: Instruction Manual
Category: Grinder
Pages: 12
Size: 1.04 MB

 

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1

Important Safety Information

Intended Use

GRINDERS, TYPE-27 INSTRUCTION MANUAL

101 mm (4 in.) - 113 mm (4 1/2 in.)

12,000 RPM

Please read, understand and follow all safety information contained in these instructions prior to the use of this tool.
Retain these instructions for future reference.

These pneumatic tools are intended for use in industrial locations, and used only by skilled, trained professionals in accordance with the instructions in this 

manual. These pneumatic tools are designed to be used with the appropriate size Type 27 Wheel for grinding metals. They should only be used for such grinding 

applications and within their marked capacity and ratings. Only accessories specifically recommended by 3M should be used with these tools. Use in any other 

manner or with other accessories could lead to unsafe operating conditions. 

Do not operate tool in water or in an excessively wet application.

Do not use disc pads that have a Max RPM less than the tool Max RPM rating.

Tools shall be inspected periodically to verify that ratings, markings, and labels are legible. Contact 3M Company to obtain replacement labels.

Summary of device labels containing safety information

Marking

Description

 

WARNING: READ AND UNDERSTAND INSTRUCTION MANUAL BEFORE

OPERATING TOOL.

 

WARNING: ALWAYS WEAR APPROVED EYE PROTECTION

 

WARNING: ALWAYS WEAR APPROVED HEARING PROTECTION

 

WARNING: AVOID PROLONGED EXPOSURE TO VIBRATION

Direction of Rotation

Prolonged vibration may cause injury

Vibration Safety Note

12,000 r/min

Maximum Rotational Speed

90 PSIG / 6.2 BAR MAX

Maximum Air Pressure

Use accessories rated at tool speed or higher

Accessories Speed Warning Note

Explanation of Signal Word Consequences

 WARNING:  Indicates a potentially hazardous situation which, if not avoided, may result in death or serious injury and/or property damage.
 CAUTION: 

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury and/or property damage.

Original Instructions

WARNING

Read the Safety   

Data Sheets (SDS)  

 before using any materials.

Contact the suppliers of the 

workpiece materials and abrasive 

materials for copies of the SDS if 

one is not readily available.

Exposure to 

DUST generated from 

workpiece and/or abrasive  

materials can result in lung  

damage and/or other physical  

injury.
Use dust capture or local exhaust  

as stated in the SDS. Wear 

government-approved respiratory 

protection and eye and skin 

protection.
Failure to follow this warning can 

result in serious lung damage  

and/or physical injury.

 


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1

2

To reduce the risks associated with impact from abrasive product or tool breakup, sharp edges, hazardous pressure, rupture, vibration and 

noise:

•  Read, understand and follow the safety information contained in these instructions prior to the use of this tool. Retain these instructions for future 

reference.

•  Only personnel who are properly trained should be allowed to service this tool.
•  Practice safety requirements. Work alert, have proper attire, and do not operate tools under the influence of alcohol or drugs.
•  Operators and other personnel must always wear protection for eyes, ears, and respiratory protection when in the work area or while operating 

this product. Follow your employer’s safety policy for PPE’s and/or ANSI Z87.1 or local/national standards for eyewear and other personal protective 
equipment requirements.

•  Wear leather apron or other protective apparel, taking into consideration the type of work being done.
•  Never exceed marked maximum input pressure (90psi / .62Mpa / 6.2Bars).
•  Proper eye protection must be worn at all times.
•  Tool is not to be operated in the presence of bystanders.
•  If you notice any abnormal noise or vibration when operating the product, immediately discontinue its use and inspect for worn or damaged abrasive 

product or accessories. Correct or replace the suspect component. If abnormal noise or vibration still exists, return the tool to 3M for repair or 
replacement. Refer to warranty instructions.

•  Never operate this tool without all guards or safety features in place and in proper working order.
•  Prior to use, ensure guard is oriented to protect the operator from flying fragments and is properly secured.
•  Make sure the tool is disconnected from its air source before servicing, inspecting, maintaining, cleaning, and before changing abrasive product.
•  Only use wheel retainers (flanges) and wheel arbors supplied by 3M.
•  Never use this tool with Type 1 wheels or cut-off wheels.
•  Prior to use, or if dropped or jammed, inspect wheel retainers and wheel arbors and abrasive product for possible chips, cracks or other damage, and 

insure the abrasive product is correctly secured. If damaged, or if safety labels cannot be read, replace with new abrasive product, wheel retainers, 
wheel arbors, and/or labels available from 3M.

•  Never use a damaged grinder until it has been repaired.
•  Never over-ride or disable the safety features of the start-stop control such that it is in the on position.
•  Use only with mounting hardware recommended by 3M; check with 3M for mounting hardware requirements.
•  If the tool is jammed, shut off the tool and ease it free. Ensure the abrasive product is correctly secured.
•  Never allow this tool to be used by children or other untrained people.
•  Do not leave an unattended tool connected to air source.
To reduce the risks associated with skin abrasion, burns, cutting & severing, impact or entrapment:
•  Never install grinding wheels in a grinder tool which is unguarded.
•  Keep hands, hair, and clothing away from the cutting part of the tool.
•  Wear suitable protective gloves while operating tool.
•  Do not touch the rotating parts during operation for any reason.
•  Do not force tool or use excessive force when using tool.
To reduce the risks associated with vibration:
•  If any physical hand/wrist discomfort is experienced, work should be stopped promptly to seek medical attention. Hand, wrist and arm injury may result 

from repetitive work, motion and overexposure to vibration.

To reduce the risks associated with loud noise:
•  Always wear hearing protection while operating this tool. Follow your employer’s safety policy or local/national standards for personal protective 

equipment requirements

To reduce the risks associated with fire or explosion:
•  Do not operate the tool in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. The abrasives are able to create sparks 

when working material, resulting in the ignition of the flammable dust or fumes.

•  Refer to MSDS of material being worked as to potential for creating fire or explosion hazard.
To reduce the risks associated with hazardous dust ingestion or eye/skin exposure:
•  Use appropriate respiratory and skin protection, or local exhaust as stated in the MSDS of the material being worked on.
To reduce the risks associated with hazardous voltage:
•  Do not allow this tool to come into contact with electrical power sources as the tool is not insulated against electrical shock.

CAUTION!

To reduce the risks associated with whipping or hazardous pressure/rupture:
•  Ensure supply hose is oil resistant and is properly rated for required working pressure.
•  Do not use tools with loose or damaged air hoses or fittings.
•  Be aware that incorrectly installed hoses and fittings might unexpectedly come loose at any time and create a whipping/impact hazard.
To reduce the risks associated with flying off of accessory parts:
•  Use care in attaching abrasive product and mounting hardware; following the instructions to ensure that they are securely attached to the tool 

before use.

•  Never point this product in the direction of yourself or another person, or start tool unintentionally.
•  Never over-tighten accessory fasteners.

WARNING

 


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3

Parts Page

PARTS LIST FOR PN 28403, 12000 RPM, 4” GRINDER, TYPE-27 (SERIES C)

 Fig 

3M PN

Description

Qty 

1

87431

Grease Seal (21" x 29" x 4")

1

2

87420

Bearing Retainer

1

3

87432

3/8"-24 Spindle Shaft

1

4

30367

Ball Bearing (17" x 35" x 10")

1

5

06648

Gear Spacer

1

6

87419

Felt Washer (Output)

1

7

87421

Spiral Bevel Gear 12,000 RPM

1

8

87417

7/16"-20 Nylon Nut

1

9

55144

Ball Bearing  

0.500" x 0.25" x 0.125"

2

10

87426

Wave Disc Spring  

(0.494" x 0.377" x 0.009")

1

11

66767

Socket Cap Screw 

1

12

66766

Washer

2

13

55083

1/4"-20 Hex Nut

1

14

87433

4" Type 27 Guard

1

15

87418

Angle Head

1

16

87423

Clamp Nut

1

17

55079

O-Ring (1.19" x 0.063")

1

18

87424

Spiral Retaining Ring

1

19

87422

Spiral Bevel Gear 12,000 RPM

1

20

87429

Felt Washer (Input)

1

21

06652

Angle Head Spacer

1

22

06510

Ball Bearing  

(3/8" x 7/8" x 9/32")

1

23

28992

Front End Plate

1

24

29004

Font Wear Plate

1

25

06562

Rotor (5 Slot)

1

26

28979

Vane Kevlar 1 HP (Set of 5)

1

27

06563

Cylinder

1

 Fig 

3M PN

Description

Qty 

28

28981

Rear Endplate

1

29

06508

Ball Bearing  

(1/4" x 5/8" x 0.1961")

1

30

06567

Washer  

(0.251" x 0.468" x 0.063)"

1

31

06568

Screw #8-32 x 3/8" 

1

32

06609

O-Ring (1.38" x 0.094")

1

33

28977

Steel Housing 1 HP

1

34

06642

Lever Assembly

1

35

28980

Trigger Valve

1

36

28983

O-Ring

1

37

06614

Spring

1

38

06620

O-Ring

1

39

06627

Air Regulator

1

40

06616

Pin

1

41

87402

Roll Pin

1

42

28978

Housing Cover 1 HP

1

43

29006

Muffler

1

44

28982

Diffuser Screen

1

45

29007

O-Ring

1

46

28991

3/8" NPT Bushing

1

47

87126

Label

1

Not shown

55082

Lower Wheel Flange

1

Not shown

55085

Upper Wheel Flange

1

Not shown

55081

Spanner Wrench

1

Not shown

06524

5/8" Wrench

1

Assembly Requirements

Fig.

Torque / Specification

Threadlocker

2

10-15 ft-lb

3MTL62

6

Soak in Air Motor Oil

None

8

120 in-lb

None

11

120 in-lb

None

16

15-20 ft-lb

3MTL62

19

90-120 in-lb

3MTL62

20

Soak in Air Motor Oil

None

31

15-20 in-lb

3MTL42

46

20-25 ft-lb

3MTL62

 


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3

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30 31

32

33

34

35

36

37

38

39

40

41

42

43

44 45

46

47

13

Parts Page

PARTS LIST FOR PN 28405, 12000 RPM, 4 1/2” GRINDER, TYPE-27 (SERIES C)

 Fig

3M PN

Description

Qty 

1

87431

Grease Seal (21" x 29" x 4")

1

2

87420

Bearing Retainer

1

3

87416

5/8"-11 Spindle Shaft

1

4

30367

Ball Bearing (17" x 35" x 10")

1

5

06648

Gear Spacer

1

6

87419

Felt Washer (Output)

1

7

87421

Spiral Bevel Gear 12,000 RPM

1

8

87417

7/16"-20 Nylon Nut

1

9

55144

Ball Bearing  

0.500" x 0.25" x 0.125"

2

10

87426

Wave Disc Spring  

(0.494" x 0.377" x 0.009")

1

11

87437

4.5" Type 27 Grinder Guard

1

12

66767

1/4"-20 x 3/4" Screw

1

13

66766

Washer

2

14

55083

Hex Nut

1

15

87418

Angle Head

1

16

55079

O-Ring (1.19" x 0.063")

1

17

87423

Clamp Nut

1

18

87424

Spiral Retaining Ring

1

19

87422

Spiral Bevel Gear 12,000 RPM

1

20

87429

Felt Washer (Input)

1

21

06652

Angle Head Spacer

1

22

06510

Ball Bearing  

(3/8" x 7/8" x 9/32")

1

23

28992

Front End Plate

1

24

29004

Font Wear Plate

1

25

06562

Rotor (5 Slot)

1

 Fig

3M PN

Description

Qty 

26

28979

Vane Kevlar 1 HP (Set of 5)

1

27

06563

Cylinder

1

28

28981

Rear Endplate

1

29

06508

Ball Bearing  

(1/4" x 5/8" x 0.1961")

1

30

06567

Washer  

(0.251" x 0.468" x 0.063")

1

31

06568

Screw #8-32 x 3/8" 

1

32

06609

O-Ring (1.38" x 0.094")

1

33

28977

Steel Housing 1 HP

1

34

06642

Lever Assembly

1

35

28980

Trigger Valve

1

36

28983

O-Ring

1

37

06614

Spring

1

38

06620

O-Ring (0.364" x 0.070")

1

39

06627

Air Regulator

1

40

06616

Pin

1

41

87402

Roll Pin

1

42

28978

Housing Cover 1 HP

1

43

29006

Muffler

1

44

28982

Diffuser Screen

1

45

29007

O-Ring

1

46

28991

3/8" NPT Bushing

1

47

87126

Label

1

Not shown

06589

Wheel Flange

2

Not shown

55115

Spanner Wrench

1

Not shown

06524

5/8" Wrench

1

Assembly Requirements

Fig.

Torque / Specification

Threadlocker

2

10-15 ft-lb

3MTL62

6

Soak in Air Motor Oil

None

8

120 in-lb

None

12

120 in-lb

None

17

15-20 ft-lb

3MTL62

19

90-120 in-lb

3MTL62

20

Soak in Air Motor Oil

None

31

15-20 in-lb

3MTL42

46

20-25 ft-lb

3MTL62

 


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5

Product Configuration/Specifications:

Operating / Maintenance Instructions

PRIOR TO THE OPERATION
The tool is intended to be operated as a hand held tool. It is always recommended that while using the tool, operators stand on a solid floor, in a secure position 
with a firm grip and footing. Be aware that the tool can develop a torque reaction. See the section “SAFETY PRECAUTIONS”.

Use a clean lubricated air supply that will give a measured air pressure at the tool of 6.2 bar (90 psig) when the tool is running with the lever fully depressed. It is 
recommended to use an approved 10 mm (3/8 in) x 8 m (25 ft) maximum length airline. Connect the tool to the air supply as shown in Figure 1. Do not connect the 
tool to the airline system without an easily accessible air shut off valve. It is strongly recommended that an air filter, regulator and lubricator (FRL) be used as shown 
in Figure 1 as this will supply clean, lubricated air at the correct pressure to the tool. In any case appropriate air pressure regulators shall be used at all times while 
operating this tool where the supply pressure exceeds the marked maximum of the tool. Details of such equipment can be obtained for your tool distributor. If such 
equipment is not used, the tool should be manually lubricated. To manually lubricate the tool, disconnect the airline and put 2 to 3 drops of suitable pneumatic motor 
lubricating oil such as 3M™ Air Tool Lubricant PN 20451 (or equivalent 10 centistoke oil) into the air inlet of the tool. Reconnect tool to the air supply and run tool 
slowly for a few seconds to allow air to circulate the oil. If the tool is used frequently, lubricate it on a daily basis or lubricate it if the tool starts to slow or lose power. 
It is recommended that the air pressure at the tool be 6.2 bar (90 psig) while the tool is running so the maximum RPM is not exceeded. The tool can be run at lower 
pressures but should never be run higher than 6.2 bar (90 psig). If run at lower pressure the performance of the tool is reduced.

*   Declared noise levels; measurements carried out in accordance with standard EN ISO 15744.
**  Declared vibration levels in accordance with EN ISO 20643 and EN ISO 28927.

IMPORTANT NOTE: The noise and vibration values stated in the table are from laboratory testing in conformity with stated codes and standards and are not 
sufficient risk evaluation for all exposure scenarios. The actual exposure values and amount of risk or harm experienced to an individual is unique to each 
situation and depends upon the surrounding environment, the way in which the individual works, the particular material being worked, work station design, as 
well as upon the exposure time and the physical condition of the user. 3M™ cannot be held responsible for the consequences of using declared values instead of 
actual exposure values for any individual risk assessment.

For Series C grinders, the angle head and gears have been designed to last the life of the tool without periodic maintenance. When rebuilding or repairing the tool, 
lubricate angle head with Castrol Longtime PD 00 grease or equivalent lithium thickener, NCGI Grade 00 grease, 1 tsp approximate quantity. 

Model

Number

Speed

RPM

Spindle

(in.)

Product

Net WT. kg. 

(lb.)

Height

mm (in.)

*Noise Level 

dBA Pressure 

(Power)

**Vibration 

Level

m/s

2

 (ft/s

2

)

**Uncertainty 

K m/s

2

(ft/s

2

)

Series 

Designation

28403

12,000

3/8-24 

T-27

1.60 (3.53)

108 (4.25)

83.0 (94.6)

3.24 (10.63)

0.04 (0.13)

C

28405

12,000

5/8-11 

T-27

1.71 (3.78)

108 (4.25)

83.7 (95.3)

6.61 (21.67)

0.26 (0.85)

C

Recommended Airline  

Size - Minimum

Recommended Maximum  

Hose Length

Air Pressure

10mm  

3/8 in

8 meters 

25 feet

Maximum Working Pressure  6.2 bar 

90psig

Recommended Minimum 

NA 

NA

 


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5

6

Figure 1

Closed Loop Pipe System

Sloped in the direction of air flow

Drain Leg

Ball Valve

To Tool Station

Filter

Drain Valve

Regulator

Lubricator

Ball

Valve

Ball Valve

Air Flow

Air Dryer

Air Compressor

and Tank

Air Hose

To Coupler

at or near Tool

Safety Precautions

1.   Read all instructions before using this tool. All operators must be 

fully trained in its use and aware of these safety rules.

2.   The tool RPM should be checked on a regular basis (at shift change).
3.   Make sure the tool is disconnected from the air supply. Select a 

suitable abrasive grinding wheel and secure it to the mounting shaft 
using the wheel retainer and wheel arbor supplied with the tool. Be 
careful to center the grinding wheel on the wheel retainer and or 
arbor before tightening the wheel retainer nut. Do not over tighten 
the wheel retainer or you will crack the wheel.

4.   Always wear required safety equipment when using this tool.
5.   Always remove the air supply to the tool before fitting, adjusting or 

removing the abrasive grinding wheel.

6.   Always adopt a firm footing and grip and be aware of torque 

reaction developed by the tool.

7.   Use only 3M approved spare parts.
8.   Always ensure the material being worked is firmly fixed to avoid 

movement.

9.   Check hose and fittings regularly for wear. Do not carry the tool by 

its hose; always be careful to prevent the tool from being started 
when carrying the tool with the air supply connected.

10.  Dust can be highly combustible. Keep working area clean.
11.  If tool is serviced or rebuilt check to ensure that the maximum tool 

RPM is not exceeded and that there is no excessive tool vibration.

12.  Do not exceed maximum recommended air pressure. Use safety 

equipment as recommended.

13. Prior to installing any abrasive grinding wheel, always check that its 

marked maximum operating speed is equal or higher than the rated 
speed of this tool.

14. The tool is not electrically insulated. Do not use where there is a 

possibility of contact with live electricity, gas pipes, and/or water 
pipes.

15. Take care to avoid entanglement with the moving parts of the tool 

with clothing, ties, hair, cleaning rags or loose hanging objects. If 
entangled, stop air supply immediately to avoid contact with moving 
tool parts.

16.  Keep hands clear of the spinning grinding wheel during use.
17.  If the tool appears to malfunction, remove from use immediately and 

arrange for service and repair.

18.  Do not allow the tool to free spin without taking precautions to 

protect any persons or objects from the rupture of the abrasive 
grinding wheel.

19.  Immediately release the start handle in the event of any disruption 

of pressure; do not attempt to re-start until the disruption has been 
corrected.

20.  When tool is not in use, store in a clean, dry environment free of 

debris and in a manner that ensures that the grinding wheel is not 
damaged.

21.  Fixture workpiece such that the grinding cut slot is kept at a 

constant or increasing width during the operation.

22.  Operate tool in a well lit work area.
23.  Recycle or dispose of tool according to Local, State, and Federal 

regulations.

24.  Whenever performing maintenance procedures, use care to avoid 

exposure to any hazardous substances deposited on the tool as 
a result of work processes. Also, refer to warnings related to dust 
exposure.

25.  Ensure that the abrasive product is correctly mounted and tightened 

before use and run the tool at no-load speed for at least 1 min in 
a safe position; stop immediately if considerable vibration or other 
defects are detected and determine the cause of these defects.

26.  Whenever universal twist couplings (claw couplings) are used, 

lock-pins shall be installed and whip check safety cables shall be 
used to safeguard against possible hose-to-tool and hose-to-hose 
connection failure.

3M™ Type 27 Grinding Wheels and Accessories 

3M Type 27 Grinding Wheels and Accessories are designed specifically for
use on the 3M Type 27 Grinders. 

See 3M ASD Accessories to Optimize Performance catalog 61-5002-8098-9 
and Engineered Metalworking Solutions catalog 61-5002-8097-1 for additional 
accessories.

Figure A

 


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7

Disc Pad Accessories

3M PN

UPC PN

Description

Size (in)

02286

56479

Roloc™ Cool Running Disc Pad for 3/8-24 Spindle

4 x 3/8-24 INT

28474

28474

Roloc™ Disc Pad, Hard for 3/8-24 Spindle

4 x 3/8-24 INT

28475

28475

Roloc™ Disc Pad, Extra Hard for 3/8-24 Spindle

4 x 3/8-24 INT

28473

28473

Roloc™ Cool Running Disc Pad for 5/8-11 Spindle

4 x 5/8-11 INT

83489

83489

Roloc™ Disc Pad, Hard for 5/8-11 Spindle

4 x 5/8-11 INT

83980

83980

Roloc™ Disc Pad, Extra Hard for 5/8-11 Spindle

4 x 5/8-11 INT

Tool Spindle Thread Size Adapters

3M PN

UPC PN

Description

Size (in)

00009

22970

No. 9 Disc Holder Adapter

5/8-11 EXT 3/8-24 INT

00009

22971

No. 9 Disc Holder Adapter with M10 Thread

5/8-11 EXT M10-1.25 INT

Fibre Disc Mounting Accessories

3M PN

UPC PN

Description

Size (in)

28442

28442

Disc Pad Hub For Short Shaft Tools

2 1/2 x 3/8-24 INT

28476

28476

Low Profile Disc Pad Hub

2 1/2 x 5/8-11 INT

28443

28443

Disc Pad Face Plate Ribbed, Extra Hard Red

4 1/2

3M™ Fibre Discs and Accessories

3M™ Disc Pad Accessories

Related Products

Refer to ANSI B7.1-2000 Safety Requirements for Use, Care and Protection of Abrasive Wheels and ISO/EN 12413 Safety. Requirements for Bonded Abrasive 
Products for proper abrasive wheel applications.

Choose from full line of 3M™ quality abrasives and these complimentary accessories to optimize tool performance.

3M Fibre Discs and Accessories are designed specifically for use on the 3M Type 27 Grinders and Sanders.

3M Disc Pad Accessories are designed specifically for use on the 3M Type 27 Grinders and Sanders.

 


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7

8

Type 27 Wheel Mounting Hardware and Usage

Type 27 Grinding Wheels are also known as Depressed Center Grinding Wheels. They have a dish shaped center to allow the lower mounting hardware or flange 
to be recessed into the wheel. This allows the wheel to be used in a nearly flat orientation when needed.

Model 28403 has a 3/8”-24 spindle to be used with Type 27 Grinding Wheels with 3/8” center holes (CH).

Model 28405 has a 5/8”-11 spindle and can use wheels with either 16 mm or 7/8” center holes (CH).

Model 28403 can accommodate an adapter to change the spindle to 5/8”-11 spindle to allow the use of wheels with either 16 mm or 7/8” center holes (CH).

Refer to ANSI B7.1-2000 Safety Requirements for Use, Care and Protection of Abrasive Wheels and ISO/EN 12413 Safety Requirements for Bonded Abrasive 
Products for proper abrasive wheel applications.

MOUNTING 3/8” CENTER HOLE TYPE 27 WHEELS

Figure 1

Lower Flange for 3/8” CH
Type 27 Wheels

Lower Flange: NOTE: 
Curved surface goes into 
the wheel’s center

Upper Flange for 3/8” CH 
Type 27 Wheels

Upper Flange:  
NOTE: Wheel’s curved backside 
goes into the flange’s center

Type 27 Wheel with 3/8” 
Center Hole, properly 
mated to Upper Flange

Lower Flange for 3/8” CH 
Type 27 Wheel properly 
mounted

Figure 2

Figure 3a

Figure 3b

 


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9

DUAL SIZE FLANGES FOR 3/8-24 SPINDLE TOOLS
Models 28403 and 28413 can take a Dual Size Flange Set to allow the use of wheels with either 16 mm or 7/8” center holes (CH). 
NOTE: Both flanges must face the wheel with the same size lip inserted in the wheel’s center hole.

MOUNTING 7/8” CENTER HOLE TYPE 27 WHEELS

Type 27 Wheels with 7/8” center holes (CH) may use flat flanges that have a 7/8” lip to center the wheel.

Figure 4

Figure 5

Figure 6

Figure 6A

Figure 6B

Figure 7

Figure 8

5/8”-11 threads per 
inch Spindle with Upper 
Flange properly 
mounted

For Wheels less than 
3/8” thick: Lower Flange 
for 7/8” Type 27 Wheels 
properly mounted

For Wheels 3/8” thick 
and Greater: Lower 
Flange for Type 27, 7/8” 
Center Hole Wheels.
Note 7/8” lip is  
facing the  
wheel

Dual Size Flanges for 16 mm and 7/8” CH Wheels

Side A: 16 mm lip

Side B: 7/8” lip

7/8” lip

3/8”-24 Spindle

Dual Size Flange ready for a 
7/8” CH Wheel

Type 27 Wheel with 7/8” 
CH properly centered 
on Flange
NOTE: Depressed 
Center of  
Wheel

NOTE: 7/8” lip to center the wheel

Flanges for Type 27 7/8” Center Hole Wheels

Side A, 7/8” lip

Side B, no lip

 


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9

10

3M™ Fibre Disc Mounting Hardware and Usage

Fibre Discs are a non-bonded abrasive disc, (not a wheel) and may be mounted to Grinders for some similar metal working applications as Type 27 Wheels. 

FIBRE DISC MOUNTING HUBS AND DISC PLATES

The Hub attaches to the spindle of the tool. It provides a mounting base for the Disc Pad Face Plate.

Figure 11

Figure 12

Figure 13

Figure 9

Figure 10

Hubs for Fibre Disc Mounting:
3M PN 28442 Disc Pad Hub for Short Shaft Tools 3/8-24 INT, 5/8-11 EXT
3M PN 28476 Low Profile Disc Pad Hub 5/8-11 INT

Type 27 Wheel with 7/8” CH 
properly mounted to Upper 
Dual Size Flange

Dual Size Lower Flange 
properly mounted with 7/8” 
CH Type 27 Wheel 

5/8”-11 Threads per inch Spindle

3M PN 28476 Low Profile Disc Pad Hub 5/8-11 INT properly 
mounted on 5/8-11 Spindle

3/8”-24 Threads per inch Spindle

16 mm lip

NOTE: Depressed Center 
of Wheel

 


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11

DISC RETAINER NUT AND TN QUICK CHANGE CENTER THREADED FIBRE DISCS

Fibre Discs can be held in place by a Disc Retainer Nut or by a pre-installed threaded center hub on the Fibre Disc itself (TN Quick Change System).

NOTE: Endure TN Quick Change Disc or Disc Retainer Nut are fully tightened onto the 5/8-11 spindle. 

NOTE: A Disc Retainer Nut is not required if a TN Quick Change disc is mounted.

Figure 16

Figure 17

Figure 18

Figure 14

Figure 15

3M PN 28442 Disc Pad Hub 

for Short Shaft Tools 3/8-24 

INT, 5/8-11 EXT

NOTE: 3/8-24 Tool 
Spindle Inside 5/8-11 
Hub Spindle

3M PN 02618 Disc Retainer Nut 5/16” x 5/8-11 INT

Fibre Disc with TH Quick Change Center 5/8-11 INT

TN Quick Change Disc properly mounted

Disc Retainer Nut properly mounted

Disc Pad Face Plate properly 
mounted to Hub 
NOTE: Ensure Face Plate is 
fully pressed onto Hub  
and that ribs are  
visible 

Face Plate
Hub
Ribs

 


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11

12

Warranty and Limited Remedy: 3M warrants this tool against defects in workmanship and materials under normal operating conditions for one (1) year from 
the date of purchase. 3M MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OR CONDITION 
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR ARISING OUT OF A COURSE OF DEALING, CUSTOM OR USAGE OF TRADE. Many factors beyond 
3M’s control and uniquely within user’s knowledge and control can affect the use and performance of a 3M product in a particular application.  As a result, 
customer is solely responsible for evaluating the product and determining whether it is appropriate and suitable for customer’s application, including conducting 
a workplace hazard assessment and reviewing all applicable regulations and standards (e.g., OSHA, ANSI, etc.).  Failure to properly evaluate, select, and use a 

3M product and appropriate safety products, or to meet all applicable safety regulations, may result in injury, sickness, death, and/or harm to property. User must 
operate the tool in accordance with all applicable operating instructions, safety precautions, and other procedures stated in the operating manual to be entitled to 
warranty coverage. 3M shall have no obligation to repair or replace any tool or part that fails due to normal wear, inadequate or improper maintenance, inadequate 
cleaning, non-lubrication, improper operating environment, improper utilities, operator error or misuse, alteration or modification, mishandling, lack of reasonable 
care, or due to any accidental cause. If a tool or any part thereof is defective within this warranty period, your exclusive remedy and 3M’s sole obligation will be, at 
3M’s option, to repair or replace the tool or refund the purchase price.
Limitation of Liability: Except for the limited remedy stated above, and except to the extent prohibited by law, 3M will not be liable for any loss or damage arising 
from or related to the 3M product, whether direct, indirect, special, incidental, or consequential (including, but not limited to, lost profits or business opportunity), 
regardless of the legal or equitable theory asserted, including, but not limited to, warranty, contract, negligence, or strict liability.
Submitting a Warranty Claim: Contact you dealer when submitting a warranty claim in accordance with the restrictions listed above. Please note that all 
warranty claims are subject to manufacturer’s approval. Be sure to keep you sales receipt in a safe place. This must be submitted when filing a warranty claim, 
within 1 year from the date of purchase. For additional assistance call 1-800-362-3550 (choose option 3, then option 5).
Product Repair after Warranty Has Expired: Repair of 3M Abrasive Power tools that are not under warranty is available through 3M or a 3M Authorized Tool 
Repair Representative. Contact your 3M Abrasive Power Tool Distributor for details, or call 1-800-362-3550.
For 3M Product Information Call:
800-3M HELPS (800-364-3577) toll free
651-737-6501 direct dial

Abrasive Systems Division
3M Center
St. Paul, MN 55144-1000
www.3M.com/abrasives

© 3M 2017.
3M and Roloc are trademarks of 3M Company. 
34-8707-1833-4

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