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Technical Information Shaft Collar in Shell
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Plastic Torque Charts

 
 

Unlike the rest of our standard shaft collars and couplings that have a single torque rating per screw size, plastic shaft collars are extremely dependent on collar size to determine acceptable torque limits. The following table should be used only as a guideline to tighten plastic collars. Due to the elastic nature of plastics, it is recommended that screw torque be applied in a slow and steady manner as to not induce extra shock into the plastic resulting in premature collar failure.

  Inch Forged Socket Cap Screws
Stainless Steel
Screw Size
Collar
Size
Seating Torque
(in-lb)
Typical Axial Load
(lbs)
#4-40 CL-4-P 2.0 100
#6-32 CL-6-P 5.0 120
#8-32 CL-8-P 7.5 140
#10-32 CL-10-P 10.0 165
1/4-28 CL-12-P 18.0 260
1/4-28 CL-16-P 18.0 410
1/4-28 CL-21-P 20.0 510
1/4-28 CL-24-P 23.0 330

 

  Metric Forged Socket Cap Screws
Stainless Steel
Screw Size
Collar
Size
Seating Torque
(N-m)
Typical Axial Load
(N)
M3 MCL-6-P 0.2 267
M3 MCL-10-P 0.5 578
M4 MCL-12-P 1.1 1201
M5 MCL-16-P 1.7 1468
M6 MCL-25-P 2.8 1601
M6 MCL-30-P 3.9 2113

LIABILITY DISCLAIMER

The information chart presented on this page are typical values under certain test conditions and are not a guarantee of average values nor a guarantee of maximum or minimum values under all conditions. Thrust values shown are FAILURE MODE. They are shown solely for the reader to utilize appropriate testing equipment to make his/her own evaluation, and are not intended by Ruland Manufacturing Co., Inc., as warranties, either express or implied, of fitness for a given purpose. A full disclaimer and limited warranty can also be found on this site.