Cratex Rubber Abrasive Products

Applications | Grits and Abrasives

Block and Sticks | Cones | Wheels | Small Wheels | Points

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Basic Applications
Light Deburring
and smoothing to relieve stress concentrations and to remove visible and microscopic burrs without impacting surrounding areas.

Smoothing and polishing to improve wearing qualities and to reduce the dangers of progressive fracture and fatigue failure.

Cleaning and polishing to remove undesirable surface deposits.

Polishing and smoothing to improve performance, appearance, cleanliness and to lessen the dangers of surface contamination.

Typical Applications Include:
Breaking edges, radiusing and polishing out high spots, removing rust, cleaning threads, smoothing the edges of punched or sheared metal, deflashing, smoothing and polishing molds, dies and other production tools, sharpening and honing of cutting dies, blades and edged tools, removing corrosion, excess solder, heat marks, cleaning and polishing contact points, jacks and electrodes, removing tool marks, scratches light burrs, and fins, blending in welded seams after rough grinding, engine turning, damaskeening, polishing engine ports, shafts, turbine blades, smoothing glass edges, jewelry finishing, gem stone sanding and many others.

Cratex Rubber-bonded Abrasives are used in a widely diversified list of industries, on production and assembly lines, in finishing operations, in tool and machine shops, in the production of basic tools, instruments, component parts and for maintenance and repairs.

 



Grit Textures
Each Cratex size and shape is made in four standard Grit Textures or compositions which differ in accordance with the mesh size of the abrasive grain used. [C] COARSE (Green) [M] MEDIUM (Dark Brown) [F] FINE (Reddish Brown) [XF] EXTRA FINE (Grey Green)

Cratex Standard Bond
The Cratex bond common to each of the four Grit Textures is made with premium grade oil-resistant chemical rubber. In contrast to conventional grinding wheels the Cratex bond has unique cushioned action...cuts freely, smoothly and softly without gouging or digging into the work surface. It resists clogging or smearing, and is ideal for a broad range of applications where metallic or non-metallic surfaces must be smoothed and polished without loss of dimensional tolerances or control.

Cratex Abrasive Type
The abrasive type used in Cratex Rubberized Abrasives is premium-quality Silicon Carbide that has been washed, dried and treated to remove impurities and then carefully screened to U.S. Department of Commerce standards for size. Although silicon carbide is more expensive than other abrasive materials, it is used because it has a high level of purity and has been found to be best for the broadest range of light deburring, smoothing, cleaning and polishing applications on ferrous and non-ferrous alloys as well as many non-metallics, such as glass.

Shapes and Sizes
The Cratex Wheels, Points, Cones, Blocks and Sticks listed are all available as standard products. The occasional need for non-catalog shapes or compositions can usually be solved by adapting or modifying standard shapes and compositions to meet special requirements. Several wheels can be mounted in series for added width. The abrasive action of the wheels can be softened by using lower operating speeds and lighter work pressures. Cratex Rubber Bonded Abrasives can also be dressed or shaped to special contours using conventional abrasive wheel dressing tools and methods.

When Ordering
Specify the part number and grit texture. [C] Coarse, [M] Medium, [F] Fine, [XF] Extra Fine. For Example: CRA.54-C. Certain products are sold in units of 1 and others in boxes of 100.

 


Cratex Blocks & Sticks
blocks.gif (6574 bytes)Posessing the same superior qualities as other Cratex products, Cratex Blocks and Sticks are excellent hand tools for cleaning and polishing metal surfaces, for breaking edges, smoothing away high spots, removing rust, heat marks, tarnish and stains. Designed for either manual or mechanical operation, they can be mounted in tool holding fixtures, chucks, or cradles. Use them for polishing shafts...damaskeening...cleaning and dressing diamond wheels...polishing rotating cylindrical parts, cleaning calibrations and reference points, and for removing feather edges and touching up cutting tools, dies, chisels and other sharp edged tools.

 

Length Cross Section Part No.
6 Square
1/4 x 1/4 CRA.6202
1/2 x 1/2 CRA.6404
3/4 x 3/4 CRA.6606
1 x 1 CRA.6808

3 Oblong
1 x 1/4 CRA.3802

4 2 x 3/8 CRA.4163

6 1 x 1/8 CRA.6801
1 x 1/4 CRA.6802
1 x 3/8 CRA.6803
2 x 1/4 CRA.6162
2 x 1 CRA.6168

8 1 x 1/2 CRA.8804

6 Round
3/16 CRA.036
1/4 CRA.046
5/16 CRA.056
3/8 CRA.066
1/2 CRA.086
5/8 CRA.0106
3/4 CRA.0126
7/8 CRA.0146
1 CRA.0166

 

 

 

 


Cratex Cones
rubcones.gif (13560 bytes)Cratex Cones are the best answer to many difficult deburring, smoothing and polishing problems. They are easily shaped to contour while being used or by using a Cratex conventional dressing tool.They are ideal for cleaning and polishing grooves, ball corners, flares, angles and other hard to reach surfaces as well as for use on molds, dies, castings, combustion chambers and ports, stainless steel tanks, shafts, turbine blades, and many others.

Dimensions in inches
Shape Length Diameter Arbor Hole Part No.

Tapered 1 5/8 to 1/4 1/4 CRA.1340
Tapered 1-1/4 7/8 to 1/4 1/4 CRA.1345
Tapered 1-1/4 1 to 1/4 1/4 CRA.1349
Tapered 2 1 to 1/2 1/4 CRA.1848
Cylinder 1 7/8 1/4 CRA.1350
Cylinder 1-1/2 1 1/4 CRA.1351
Pointed 1-1/4 7/8 1/4 CRA.1357
Pointed 1-3/4 1 1/4 CRA.1358
Bullet 1-3/4 7/8 1/4 CRA.4707

Cratex Cone Mandrel - Part No. CRA.1341
conemand.gif (2180 bytes)Cratex Rubberized Abrasives Cones are designed to fit Cratex Cone Mandrel No. 1341, 1/4" Shank. Maximum Safe Speed 20,000 Revolutions Per Minute with 1/2" overhang or less (exposed mandrel length). For each additional 1/4" of overhang the Maximum Safe Speed is decreased by at least 20%.

Maximum Safe Speed is 20,000 Revolutions Per Minute. Best results are usually obtained at 30% to 80% of Maximum Safe Speed. Use a light work pressure.



Wheels

Dimensions in inches
Diameter Thickness Arbor Hole Part No.

1-1/2 1/8 1/8 CRA.152
3/16 1/4 CRA.153
1/4 1/4 CRA.154
3/8 1/4 CRA.156
1/2 1/4 CRA.158

2 1/8 1/4 CRA.202
3/16 1/4 CRA.203
1/4 1/4 CRA.204
3/8 1/4 CRA.206
1/2 1/4 CRA.208

2-1/2 1/4 1/4 CRA.254
3/8 1/4 CRA.256
1/2 1/4 CRA.258

3 1/8 1/4 CRA.302
1/4 1/4 CRA.304
3/8 1/4 CRA.306
1/2 1/4 CRA.308
3/4 1/2 CRA.312
1 1/2 CRA.316

4 1/8 1/2 CRA.402
1/4 1/2 CRA.404
3/8 1/2 CRA.406
1/2 1/2 CRA.408
3/4 1/2 CRA.412
1 1/2 CRA.416

5 1/8 1/2 CRA.502
1/4 1/2 CRA.504
3/8 1/2 CRA.506
1/2 1/2 CRA.508
3/4 1/2 CRA.512
1 1/2 CRA.516

6 1/8 1/2 CRA.602
1/4 1/2 CRA.604
3/8 1/2 CRA.606
1/2 1/2 CRA.608
5/8 1/2 CRA.610
3/4 1/2 CRA.612
1 1/2 CRA.616
1-1/2 1/2 CRA.624

7 1/4 1/2 CRA.704
3/8 1/2 CRA.706
1/2 1/2 CRA.708
3/4 1/2 CRA.712
1 1/2 CRA.716

8 1/4 1/2 CRA.804
3/8 1/2 CRA.806
1/2 1/2 CRA.808
5/8 1/2 CRA.810
3/4 1/2 CRA.812
1 1/2 CRA.816
1-1/2 5/8 CRA.824

10 1/4 5/8 CRA.1004
3/8 5/8 CRA.1006
1/2 5/8 CRA.1008
5/8 5/8 CRA.1010
3/4 3/4 CRA.1012
1 3/4 CRA.1016
1-1/4 3/4 CRA.1020

 Cratex Straight Wheels - Large Size
lgwheel.gif (7519 bytes)Cratex Large Wheels have found wide application for removing rust, heat marks, tarnish, excess solder, scratches, corrosion...blending in and polishing welded seams after rough grinding...polishing bearing surfaces and raceways...removing burrs and breaking edges...smoothing and polishing castings and punched or sheared pieces...wet sanding of gem castings...wet sanding of gem stones...trimming plastic articles...smoothing glass edges...cleaning before welding or soldering...and for countless other deburring, smoothing, and polishing operations.

  • Hole sizes shown are the minimum diameter recommended for the various wheel sizes listed and wheels will be supplied this way unless larger holes are specified on your order. Wheels with larger holes can be ordered at the same price, providing hole diameter is a multiple of 1/8" and does not exceed 1-1/4". For other hole sizes, request pricing.
  • Maximum Safe Speeds in Revolutions Per Minute: 1-1/2" dia. - 15,000; 2" - 10,500; 2-1/2" - 8,300; 3" - 7,000; 4" - 5,250; 5" - 4,200; 6" - 3,600; 7" - 3,000; 8: - 2,600; 10" - 2,100. These speeds are based on 5,500 Surface Feet Per Minute. Best results are usually obtained at 30% to 80% of Maximum Safe Speed. Use light work pressure.

Cratex Wheel Mandrel - Part No. CRA.1342
lgwlmand.gif (2258 bytes)Cratex Wheel Mandrel No. 1342 has a 1/4" shank and is designed for 1/4" center hole wheels up to 3" diameter by 1/3" thick or less. The maximum safe speeds listed above are for 1/2" overhang or less (exposed mandrel length). For each additional 1/4" of overhang the maximum safe speed is decreased by at least 20%.

Cratex Dressing Block - Part No. CRA.6404-2148
The Cratex Dressing Block is ideally suited for truing, dressing, and shaping all Cratex Rubberized Abrasive Wheels. The shape is easy to handle, and the combination of fast cutting abrasive with a hardened bond provides an easy to use, efficient, and long lasting dresser that will enable you to achieve optimum performance from all your Cratex Rubberized Abrasive Wheels. Size: 6" x 1/2" x 1/2"



Cratex Points
rubpoint.gif (12859 bytes)Cratex Shaped points are made in both cylinder and bullet shapes...for smoothing and polishing hard to reach surfaces...grooves, ball corners, holes, clasps, spirals, flutes, and edges. They are widely used for polishing molds, dies, patterns and light castings; for cleaning contact points, solder spots and for relieving stress, micro-deburring, and damaskeening.

Dimensions in inches
Shape Length Diameter Arbor Hole Part No.

Cylinder 1/2 1/4 1/16 CRA.4
Cylinder 7/8 1/4 1/16 CRA.6
Bullet 1 9/32 1/16 CRA.8
Bullet 5/8 3/8 1/16 CRA.10
Bullet 1 3/8 1/8 CRA.11
Tapered 7/8 3/8 to 5/16 1/8 CRA.12
Tapered 7/8 5/8 to 1/8 1/8 CRA.14
Bullet 7/8 1/2 1/8 CRA.15

  • When a variety of Small Wheels in quantities of less than 100 is desired, see Cratex Kits and Assortments
  • Maximum Safes Speed 25,000 Revolutions Per Minute. Best results are usually obtained at 30% to 80% of Maximum Safe Speed. Use a light work pressure.
  • To order: Specify Part No. and Grit Texture, C,M,F OR XF. Example: CRA.11-M.

Cratex Point Mandrels
mandrel2.gif (2294 bytes)

Diameter in inches
Part No. Shank For Hole For Point #s

CRA.1 3/32 1/16 4, 6, 8, 10
CRA.4 1/8 1/16 4, 6, 8, 10
CRA.6 1/8 1/8 11, 12, 14, 15
CRA.9 1/4 1/8 11, 12, 14, 15

  • Mandrels No. 1 and No. 4 have a No. 3-48 thread and a hex nut flange
  • Mandrel No. 6 has a No. 5-40 thread and a hex nut flange.
  • Mandrel No. 9 has a No. 5 screw thread, and a fixed shoulder flange
  • Maximum Safe Speed 25,000 Revolutions Per Minute with 1/2" overhang or less (exposed mandrel length). For each additional 1/4" of overhang the Maximum Safe Speed is decreased by at least 20%.


Cratex Small Wheels - Tapered Edge
smwheel1.gif (2180 bytes)Cratex Shaped wheels have a tapered edge which makes them exceptionally versatile for fine work on small and delicate parts...ideal for polishing, cleaning out and finishing decorative and intricate designs

Dimensions in inches
Diameter Thickness Arbor Hole Part No.

3/8 3/32 1/16 CRA.1
5/8 3/32 1/16 CRA.2
1 1/8 1/16 CRA.5

Cratex Small Wheels - Straight Edge
smwheel2.gif (1990 bytes)Crates Small Straight Wheels can be mounted on conventional portable motor tools and used on a broad list of deburring, smoothing and polishing applications. They can be used on countless operations requiring absolute control of metal removal such as in micro-deburring, relieving stress concentration areas and polishing away fatigue lines, scratches and other surface defects. Ideal for work on dies, molds, instruments, control mechanisms, electronic parts, jewelry, aerospace components, plastic articles, light castings, models, and super sensitive scientific devices.

Dimensions in inches
Diameter Thickness Arbor Hole Part No.

5/8 3/32 1/16 CRA.53
1/8 1/16 CRA.54
1/4 1/16 CRA.59

7/8 1/8 1/16 CRA.74
3/16 1/16 CRA.76
1/4 1/16 CRA.79
1/8 1/8 CRA.74-2
3/16 1/8 CRA.76-2
1/4 1/8 CRA.79-2

1 3/32 1/16 CRA.83
1/8 1/16 CRA.80
3/16 1/16 CRA.86
1/4 1/16 CRA.88
3/32 1/8 CRA.83-2
1/8 1/8 CRA.80-2
3/16 1/8 CRA.86-2
1/4 1/8 CRA.88-2

  • The #2 after the above Part No. denotes 1/8" arbor hole.
  • When a variety of Small Wheels in quantities of less than 100 is desired, see Cratex Kits and Assortments.
  • Maximum Safe Speed 25,000 Revolutions Per Minute. Best results are usually obtained at 30% to 80% of Maximum Safe Speed. Use a light work pressure.

Cratex Small Wheel Mandrels
mandrel1.gif (3180 bytes)

Diameter in inches
Part No. Shank For Hole

CRA.2 3/32 1/16
CRA.3 1/8 1/16
CRA.5 1/8 1/8
CRA.8 1/4 1/8

  • Maximum Safe Speed 25,000 Revolutions Per Minute with 1/2" overhang or less (exposed mandrel length). For each additional 1/4" of overhang the Maximum Safe Speed is decreased by at least 20%.

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