1/2"-20 UNF/UNC Threaded Shaft Collar Two-Piece Split Clamp-Type, SteelFit standard UNF UNC threaded shafts Can be placed anywhere on shaft Superior holding power over set screw type collars Offered in High Strength and Low Profile styles UNF UNC 2 Piece Threaded Collars are used on standard threaded shafts, either UNF (fine thread) or UNC (coarse thread). They can be completely disassembled and placed anywhere on a shaft. They are precision machined, non marring, easy to adjust, with high clamping power. Stocked in: