Climax Part RC-100-KW4H @ 90 Mild Steel, Black Oxide Plating Rigid Coupling, 1 inch bore, 2 inch OD, 3 inch Length, 5/16-18 x 1/2 Set Screw
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It's designed for a 1/4" key, so the keyway dimensions are 1/8" high x 1/4" wide, and the 1" shaft you use should have the same keyway dimensions as well.
I believe it is a quarter-inch, but I did not purchase it for the keyway.
There is only one coupler included.
Selected User Reviews For Climax Part RC-100-KW4H @ 90 Mild Steel, Black Oxide Plating Rigid Coupling, 1 inch bore, 2 inch OD, 3 inch Length, 5/16-18 x 1/2 Set Screw
In case this sleeve needs to come apart later, I recommend coating the screw threads and the inside of the sleeve with never seize.
Unlike others who only have one set screw, everything has stayed locked so far.
A 1" diameter shaft could not be used because the bore was too small.
They are exactly as described, the fit is perfect, the set screws are very strong and sturdy, you will not strip them or have them work loose, they are heavy steel, and I am very happy with them. I've only used them for 300rpm max applications and haven't tried them at higher rpms, but they're all perfect out of the four I bought.
Coupling is made of mild steel and is in excellent condition.
It accomplishes the task at hand.
It's a finely crafted piece of steel. I ordered something heavy and this is exactly what I got.