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Two-piece aluminum shaft collar with alloy steel screw

Ruland Manufacturing

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

SKU CH-GY2K-8G935

Two-piece aluminium clamp collar with alloy-steel screws fits a 1-5/16 in round bore

  • Product typeCouplings, Collars & Adapters
  • Two-piece design allows installation without shaft removal
  • 2024 aluminum construction provides lightweight corrosion resistance
  • 1-5/16 inch bore fits standard inch-dimension shafts
  • Alloy steel screws deliver secure clamping force
  • 35 inch clearance diameter accommodates larger components

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.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 70% of the 693 comparable items (median $35.99).

Specifications

Product
Product typeCouplings, Collars & Adapters

Questions about this item

What does the 1-5/16 inch bore diameter mean when the collar is installed on a shaft?

The bore matches a shaft measuring exactly 1-5/16 inches, giving a precise round fit without keyway or thread engagement.

How does the two-piece clamp design with alloy steel screws affect holding power?

The split construction wraps fully around the shaft and the alloy steel screws clamp evenly, preventing marring while securing the collar in place.

What clearance is needed around the 2.35 inch diameter when mounting this collar?

An outside diameter of 2.35 inches requires at least that much free space radially so the collar can be positioned and tightened without interference.

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