precision rubber balls, ground rubber balls, precision ground rubber balls, nitrile rubber balls, neoprene rubber balls, silcone rubber balls, urethane rubber balls

RubberMill produces precision ground rubber balls to exacting tolerances and stringent rubber compound specifications. After the balls are molded, they are finished by a high-speed, accurate grinding process. The finishing process eliminates the mold parting line on precision rubber balls and results in a smooth and uniform surface. Additionally, the machining process provides the consistent, close diametrical and spherical dimensions that are required on precision balls to produce an effective seal. Special surface coatings are available on RubberMill's precision ground rubber balls for demanding service requirements.

Compounds for Ground Balls
• Nitrile (Buna-N)*
• Viton®* †
• Neoprene
• EPDM
• Silicone
• FDA Nitrile
• Urethane

* Standard Compounds †DuPont Dow Registered Trademark

Precision Ground Rubber Ball Sizes (Diameter) Tolerances

Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)

3/32 .093 2.36 .003 .003

1/8 .125 3.18 .003 .003

9/64 .140 3.56 .003 .003

5/32 .156 3.96 .003 .003

3/16 .187 4.75 .003 .003

7/32 .218 5.54 .003 .003

1/4 .250 6.35 .003 .003

5/16 .312 7.94 .003 .003

3/8 .375 9.53 .003 .003

7/16 .437 11.11 .004 .005

1/2 .500 12.70 .004 .005

9/16 .562 14.79 .004 .005

Sizes (Diameter) Tolerances

Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)

5/8 .625 15.88 .004 .005

3/4 .750 19.05 .004 .005

1 1.000 25.40 .004 .005

1 1/8 1.125 28.58 .006 .008

1 1/4 1.250 31.75 .008 .008

1 3/8 1.375 34.93 .008 .008

1 1/2 1.500 38.10 .008 .008

1 5/8 1.625 41.28 .010 .010

2 2.000 50.80 .010 .010

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RubberMill • 9897 Old Liberty Road • Post Office Box 1329 • Liberty, NC 27298
Phone: 336-622-1680 • Fax: 336-622-1685
info@rubbermill.com