Climax 1/2 in. Bore Zinc-Plated Mild Steel Set Screw Collar C-050
Shaft collar - Wikipedia
7/16"ID X 7/8"OD X 7/16"W Steel Zinc Solid Set Screw Collar | Fastenal
3/4" Shaft Set Screw Solid Steel Collar Stop zinc Plated 3/4 inch Collars AISI 1020: Amazon.com: Industrial & Scientific
Collar Assembly - includes set screw and thumbscrew - 10 Pack
Climax Metal C-031-BO Shaft Collar, One Piece, Set Screw Style, Black Oxide Plating, Steel,, Steel, 5/16" Bore Size, 5/8" OD, With 10-32 x 1/8 Set Screw - Walmart.com