Shaft Collars

Click Here
(769 KB)

2012 Shaft Collar Stock List

Click Here
(245 KB)

Shaft Couplings

Click Here
(1.2 MB)

Product Tables

Shaft Collars
Shaft Couplings
Flexible Beam


Fastening Hardware
Stick Slip
Torque Charts (Metal)
Torque Charts (Plastic)
Wrench Sizes
REACH Compliance
RoHS Compliance


Avoiding Coupling Failure
Getting a Hold on Shaft Collars
Rigid Collars for Motion Control
Shaft Couplings

Useful Tools:

Ruland Website
CAD Drawings

Connect with Ruland

Facebook Google+ Linked
Twitter YouTube

Ruland Shaft Collars and Couplings


Tightening a screw is a deceptively simple task.  When it’s done to attach collars to shafts, any number of difficulties can arise.  One common problem is stick-slip.

Stick-slip is the condition where the screw, instead of rotating uniformly as torquing continues, begins to show a stop-start pattern. Stick-slip can create a false impression that a screw has been tightened to its appropriate stress level. During tightening, a screw rotates uniformly as it’s torqued down, then it reaches a point where its rotation gets sticky.  The screw begins to turn in a choppy manner, stopping and starting even though tightening torque is constantly applied.  The lost torsioning effort during stick-slip is typically absorbed as excess friction between the threads or underside of the head and the mating parts of the clamp body, instead of contributing to the stress in the joint elements.  If these stresses in the joint are too low, the collar will not hold well.

Black Oxide:

The best way to avoid the effects of stick-slip is by using specially coated elements.  For example, black oxide helps to smooth the torqueing of screws without diminishing the frictional characteristics and holding power of the bore.  The black oxide on our carbon steel collars and couplings is formulated as part of the total performance of the product. It affects the holding ability of the collar/coupling, the anti-stick-slip characteristic and helps to keep the torque rating of the screw within its designed parameters. It also provides corrosion protection, although it is not intended to be used as an outside weather protective finish.  Clamping screws that operate smoothly during torqueing are the best assurance that stick-slip is not present.


Recent Links

Last Page Viewed
Home Page
Contact Us

Application Support: 1-888-712-3400

Application Support:  1-888-712-3400
© 2017 RotoPrecision Inc.

This website is designed for Internet Explorer Ver.10 or better.
If you need to update your version, please click Here.
© 2017 RotoPrecision Inc.