Dayton 2X739 Shaft Collar 1-1/8 in Carbon Steel 1-Piece

Shaft Collar 1-1/8 Inch Bore

The Dayton 2X739 shaft collar fits a 1-1/8 inch round bore and is made from carbon steel grade 1045. It uses a single-piece construction with an alloy steel set screw to lock onto a shaft. The collar has a 1-3/4 inch outside diameter and a 5/8 inch width. This component is intended for mechanical assemblies that require a simple axial stop or spacer.

Build Integration

The one-piece design slides onto the shaft before the set screw is tightened, so no disassembly of adjacent parts is needed. Carbon steel construction provides a solid clamping surface for moderate torque loads. The collar frees up design space because it does not require a keyway or threaded bore. Installers must ensure the shaft diameter matches the stated bore size for proper grip.

Sustained Load Behaviour

Under continuous operation the alloy steel set screw maintains its holding force without the relaxation sometimes seen in softer fasteners. Grade 1045 steel resists deformation when the collar is used as a repeated hard stop. The product carries a California Proposition 65 warning for chemicals known to cause cancer and reproductive harm. Buyers needing a two-piece or hinged collar for frequent repositioning should select a different style.