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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 and results in a smooth and uniform surface. Additionally, the machining process provides the consistent, close diametrical and spherical dimensions that are required to produce an effective seal. Typical uses for precision ground rubber balls include check valves, seals, bumpers, stops, ammunition, and flow control meters.

RubberMill stocks black, 70 Durometer (Shore A) Nitrile balls for immediate delivery. 70 duro balls made from EPDM, Neoprene, Viton, and Silicone are also available with several popular sizes in stock. We can quote other compounds, durometers, and even colors to meet your specifications.

70 Durometer Nitrile Material Specification Sheet

70 Durometer Nitrile (Buna, Buna-N, NBR) (In Stock for immediate delivery)
Sizes (Diameter) Tolerances
Item No. Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)
CBLG12B70S-.094 3/32 .094 2.38 .003 .003
CBLG12B70S-.125 1/8 .125 3.18 .003 .003
CBLG12B70S-.156 5/32 .156 3.96 .003 .003
CBLG12B70S-.188 3/16 .188 4.77 .003 .003
CBLG12B70S-.219 7/32 .219 5.56 .003 .003
CBLG12B70S-.250 1/4 .250 6.35 .003 .003
CBLG12B70S-.313 5/16 .313 7.95 .003 .003
CBLG12B70S-.375 3/8 .375 9.53 .003 .003
CBLG12B70S-.438 7/16 .438 11.13 .004 .005
CBLG12B70S-.500 1/2 .500 12.70 .004 .005
CBLG12B70S-.563 9/16 .563 14.30 .004 .005
CBLG12B70S-.625 5/8 .625 15.88 .004 .005
CBLG12B70S-.750 3/4 .750 19.05 .004 .005
CBLG12B70S-1.00 1 1.000 25.40 .004 .005

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70 Durometer Neoprene Material Specification Sheet

70 Durometer Neoprene (Chloroprene, CR)
Sizes (Diameter) Tolerances
Item No. Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)
CBLG11B70S-.094 3/32 .094 2.38 .003 .003
CBLG11B70S-.125 1/8 .125 3.18 .003 .003
CBLG11B70S-.156 5/32 .156 3.96 .003 .003
CBLG11B70S-.188 3/16 .188 4.77 .003 .003
CBLG11B70S-.219 7/32 .219 5.56 .003 .003
CBLG11B70S-.250 1/4 .250 6.35 .003 .003
CBLG11B70S-.313 5/16 .313 7.95 .003 .003
CBLG11B70S-.375 3/8 .375 9.53 .003 .003
CBLG11B70S-.438 7/16 .438 11.13 .004 .005
CBLG11B70S-.500 1/2 .500 12.70 .004 .005
CBLG11B70S-.563 9/16 .563 14.30 .004 .005
CBLG11B70S-.625 5/8 .625 15.88 .004 .005
CBLG11B70S-.750 3/4 .750 19.05 .004 .005
CBLG11B70S-1.00 1 1.000 25.40 .004 .005

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70 Durometer EPDM Material Specification Sheet

70 Durometer EPDM (Ethylene Propylene)
Sizes (Diameter) Tolerances
Item No. Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)
CBLG13B70S-.094 3/32 .094 2.38 .003 .003
CBLG13B70S-.125 1/8 .125 3.18 .003 .003
CBLG13B70S-.156 5/32 .156 3.96 .003 .003
CBLG13B70S-.188 3/16 .188 4.77 .003 .003
CBLG13B70S-.219 7/32 .219 5.56 .003 .003
CBLG13B70S-.250 1/4 .250 6.35 .003 .003
CBLG13B70S-.313 5/16 .313 7.95 .003 .003
CBLG13B70S-.375 3/8 .375 9.53 .003 .003
CBLG13B70S-.438 7/16 .438 11.13 .004 .005
CBLG13B70S-.500 1/2 .500 12.70 .004 .005
CBLG13B70S-.563 9/16 .563 14.30 .004 .005
CBLG13B70S-.625 5/8 .625 15.88 .004 .005
CBLG13B70S-.750 3/4 .750 19.05 .004 .005
CBLG13B70S-1.00 1 1.000 25.40 .004 .005

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70 Durometer Viton Material Specification Sheet

70 Durometer Viton™ (Fluorinated Hydrocarbon, FKM)
Sizes (Diameter) Tolerances
Item No. Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)
CBLG16B70S-.094 3/32 .094 2.38 .003 .003
CBLG16B70S-.125 1/8 .125 3.18 .003 .003
CBLG16B70S-.156 5/32 .156 3.96 .003 .003
CBLG16B70S-.188 3/16 .188 4.77 .003 .003
CBLG16B70S-.219 7/32 .219 5.56 .003 .003
CBLG16B70S-.250 1/4 .250 6.35 .003 .003
CBLG16B70S-.313 5/16 .313 7.95 .003 .003
CBLG16B70S-.375 3/8 .375 9.53 .003 .003
CBLG16B70S-.438 7/16 .438 11.13 .004 .005
CBLG16B70S-.500 1/2 .500 12.70 .004 .005
CBLG16B70S-.563 9/16 .563 14.30 .004 .005
CBLG16B70S-.625 5/8 .625 15.88 .004 .005
CBLG16B70S-.750 3/4 .750 19.05 .004 .005
CBLG16B70S-1.00 1 1.000 25.40 .004 .005

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70 Durometer Silicone

70 Durometer Silicone
Sizes (Diameter) Tolerances
Item No. Inch Decimal Inch Millimeters Diametrical (In.) Spherical (In.)
CBLG14W70S-.094 3/32 .094 2.38 .003 .003
CBLG14W70S-.125 1/8 .125 3.18 .003 .003
CBLG14W70S-.156 5/32 .156 3.96 .003 .003
CBLG14W70S-.188 3/16 .188 4.77 .003 .003
CBLG14W70S-.219 7/32 .219 5.56 .003 .003
CBLG14W70S-.250 1/4 .250 6.35 .003 .003
CBLG14W70S-.313 5/16 .313 7.95 .003 .003
CBLG14W70S-.375 3/8 .375 9.53 .003 .003
CBLG14W70S-.438 7/16 .438 11.13 .004 .005
CBLG14W70S-.500 1/2 .500 12.70 .004 .005
CBLG14W70S-.563 9/16 .563 14.30 .004 .005
CBLG14W70S-.625 5/8 .625 15.88 .004 .005
CBLG14W70S-.750 3/4 .750 19.05 .004 .005
CBLG14W70S-1.00 1 1.000 25.40 .004 .005

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Visit our Design Illustration #46 Ball to specify your ball needs.