Shaft Collar with set screw for 1-1/8" Diameter, Zinc-Plated Steel 5/16-18 x 5/16" Set Screw is adjusted with a 5/32" Allen wrench. For Shaft Diameter 1 1/8" OD 1 3/4" Width 5/8" Additional Specifications Zinc-Plated Steel RoHS Compliant Slide a collar onto your shaft and tighten the hex-socket set screw, which bites into the shaft for a tight hold. Zinc-plated steel offers better corrosion resistance than black-oxide steel.
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