American Collars & Couplings
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Frequently Asked Questions


What type of collars do you make or import?

We manufacture set collars, single and double split collars, threaded collars and couplings. We import set collars only.


What size collars do you make?

We make from 1/8" to 3 1/4" I.D. or bore in all types. We are also able to furnish you with metric, large O.D.s, or whatever your special needs might be. We have a department dedicated to doing specials per customer request.


What materials do you make collars from?

We use low carbon, cold rolled steel. We use non-magnetic 18-8, 303 type stainless steel. We use aluminum 6061.


Do you use powdered or sintered steel?

Absolutely not. It makes a poor quality collar and can not be welded.


Do you use bar stock or tubing?

We only use solid bar stock.


What about plating?

Zinc is standard on set collars and black oxide is standard on split collars. However, we can put any plating on any style collar including nickel.


How do your collar dimensions compare with other manufacturers?

The industry is pretty much standardized on dimensions for any given collar size and we conform to these standards.


Do you have a relief cut in your collars?

No. We have found that a relief cut weakens the collars. We can provide a relief cut on special orders for an extra cost, but we do not guarantee the collars.

What is your guarantee?

We stand behind our collars and will replace them at no charge if there is a defect, or if they fail in normal service. We do, however, have a restocking charge for collars returned simply because they are surplus or not needed by the customer.


What kind of screws do you use?

We use socket head cup point set screws in our set collars. Knurled point screws can be supplied at an extra charge. Socket head cap screws are used in all split collars and couplings. Of course, we use stainless screws in stainless collars.


What is the difference between a set collar and a split collar?

The set collar is more economical, but has less holding power. Also the screw can mar a shaft as it directly fastens to the shaft. The single-split collar has a tangential screw and does not touch the shaft; plus, because it can be compressed, the split collars have about 2 1/2 times the holding power of a set collar. The double-split collar has two tangential screws with the advantage that it can be put on a shaft without having to move other pulleys, bearings, or sprockets that are in place on the shaft. Obviously, it is in two pieces.


Do you have a minimum charge?

No. We also ship about 95% of our orders the day they are received.


Do you have volume discounts?

We certainly do. Please contact our Customer Service Department at 1-800-545-7301.