Ruland Manufacturing SP-21-A 2-Piece Clamp Shaft Collar 1-5/16 In Alum

Precision Aluminium Shaft Collar

The Ruland SP-21-A is a two-piece clamp collar machined from 2024 aluminium alloy. It fits a round shaft with a 1-5/16 inch bore and uses alloy steel screws for secure fastening. Maintenance teams and machine builders use it to locate components on inch-dimension shafts without marring the surface.

Two-Piece Clamp Design

The collar splits into two halves that clamp around an installed shaft so no disassembly of adjacent parts is required. A 9/16 inch width and 2 1/8 inch outside diameter provide a firm grip while the 2.35 inch clearance diameter avoids interference with nearby hardware. This construction suits applications where sliding a solid collar over the shaft end is impractical.

Sustained Clamping Performance

Under continuous vibration or axial load the alloy steel screws maintain holding force without the relaxation common in single-set-screw collars. The 2024 aluminium body resists deformation while the two-piece clamp distributes pressure evenly around the 1-5/16 inch bore. Buyers needing a one-piece collar or a different bore size should select another model.