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Ball Spline Assembly

The PowerTorq™ Ball Spline assembly uses rolling elements to carry a load similar to an anti-friction (ball) bearing. These elements do not wear when properly lubricated during normal use. The closed path that the bearing balls follow through the outer race is referred to as a circuit. The number of potential circuits varies with the diameter of the spline shaft. When a circuit is loaded with bearing balls, it is referred to as an "active circuit".

PowerTorq™ inner races are made of high quality 4150 alloy steel, induction hardened to Rc 56-60. PowerTorq™ outer races are made of hardened steel with ball tracks heat treated to Rc 56-60. PowerTorq™ ball spline inner and outer races are protected with a black oxide finish.

PowerTorq™ Ball Splines are straight within .010 in/ft when shipped from the factory, and do not exceed .030 inch in any 6 foot section. Twist is limited to .015 in/ft at the ball circle diameter.

Inner Race Outer Race
Product Info Details Product Info Details Performance Specifications
Product Nominal Diameter [in] Active Circuits Root Diameter [in] Part Number Ball Return Dynamic Torque [in-lb] Static Torque [in-lb]
PowerTorq 0375-3-0156 HPR6900 0.375 3 0.20 HPR6900 Cast 200 626 Specs Configure/Quote
PowerTorq 0625-6-0187 HPR8943 0.625 6 4.25 HPR8943 Cast 1770 3540 Specs Configure/Quote
PowerTorq 1000-6-0187 HPR8944 1.000 6 0.80 HPR8944 Cast 2600 7800 Specs Configure/Quote
PowerTorq 1500-6-0250 SOR8945 1.500 6 1.25 SOR8945 Stamped 8400 23170 Specs Configure/Quote
PowerTorq 1500-6-0250 HPR8945 1.500 6 1.25 HPR8945 Cast 8400 23170 Specs Configure/Quote
PowerTorq 2000-6-0312 HPR8946 2.000 6 1.67 HPR8946 Cast 16000 40270 Specs Configure/Quote
PowerTorq 2500-6-0375 HPR8947 2.500 6 2.10 HPR8947 Cast 27000 62250 Specs Configure/Quote