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ATLAS Universal Joint Specifications

Maximum Horsepower Safely Transmitted

Breaking Torque

Joint OD in inches	Angle in degrees	HP at 100 RPM	HP at 1000 RPM
7/8	10 25	0.4 0.3	2.8 2.4
1	10 25	0.7 0.5	4.9 3.3
1 1/8	10 25	0.7 0.5	4.9 3.3
1 1/4	10 25	1.2 0.7	8.4 5.6
1 1/2	10 25	2.0 1.2	14.0 9.2
1 3/4	10 25	3.4 2.3	23.8 16.0
2	10 25	5.2 3.8	36.4 24.5
2 7/16	10 25	9.0 6.5	63.0 42.0
2 13/16	10 25	13.0 8.5	91.0 60.0
3 3/16	10 25	17.0 11.2	119.0 78.0
4 3/16	10 25	34.0 23.0	200.0 140.0

Joint OD in Inches	Breaking Torque in inch-pounds
3/4	1,450
7/8	1,600
1	3,500
1 1/8	3,700
1 1/4	6,000
1 1/2	9,500
1 3/4	15,000
2	22,000
2 7/16	30,000
2 13/16	44,000 est.
3 3/16	60,000 est.
4 3/16	120,000 est.

Application Recommendations

CORRECT WAY

WRONG WAY

Connecting two U-Joints to same shaft

CASE 1. When using two joints with equal angles, and the drive and driven shafts have a common plane, use the "correct way" as shown above."

CASE 2. When using two joints with unequal angles, and the drive and driven shafts have a common plane, connect as in case 1. Keep difference between the angles a minimum and keep RPM as low as possible.

CASE 3. When two joints have equal angles, but the drive and driven shafts do not have a common plane, connect as shown above. If this does not result in a smooth drive, rotate one joint with respect to the other on the connecting shaft until a smooth drive results.

CASE 4. When two joints have unequal angles and the drive and driven shafts do not have a common plane, keep the difference between the two angles at a minimum and the RPM as low as possible, and follow case 3 instructions for obtaining a smooth drive.

CASE 5. When using one joint, keep RPM low and try to keep angle the joint makes with a straight line under 12 degrees.

NOTE: Whenever possible, use universal joints in pairs running at equal angles.

Order Assembly parts by name
1. Joint End or Yoke 2. Cap Screw. Rivet on 1.125" OD and smaller 3. Sleeve Bushings, not threaded 4. Sleeve Bushings, threaded 5. Center Block. Grease Reservoir on 1.5" OD and larger. 6. Cross Pin 7. Oiler (1.5" OD and larger). 8. Collar Bushing (2 7/16" OD and larger)