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Black oxide steel step-down adapter with clamp-on bore and reduced shaft diameter

Climax Metal Products

Climax Metal Products SDA-137 Step Down Adapter 1 3/8 in Bore

SKU CH-2RZQ-VG790

A step-down adapter with a 1 3/8 in bore and 1 1/8 in shaft diameter, made from ASTM A108 steel with black oxide finish

  • Adapts 1 3/8 in bore to 1 1/8 in shaft for flexible mounting
  • Black oxide finish on ASTM A108 steel resists corrosion in harsh environments
  • Precision bore tolerance of +.003/-.000 ensures accurate alignment
  • ASTM A574 grade screws provide high-strength clamping force
  • Compact 5 in overall length fits tight machine spaces

Step-down adapter for 1 3/8 in bore

The Climax Metal Products SDA-137 is a clamp-on step-down adapter designed to connect a 1 1/8 in shaft into a 1 3/8 in bore. It suits maintenance crews and machine shops needing a secure transition between different shaft and bore sizes in power-transmission assemblies. The steel body with black-oxide finish resists corrosion in industrial environments.

Inch-system tolerances and clamp-on fit

The adapter operates entirely within the inch measurement system. Bore tolerance is held to +0.003/-0.000 in while shaft tolerance is -0.000/-0.003 in, so interference or clearance depends on the mating parts you supply. The 1/4-28 set screw secures the connection, but the holding force is limited by the screw grade and the clamp-on design rather than a keyed or splined interface.

Bore depth of 2 1/4 in determines engagement

The 2 1/4 in bore depth is the single dimension that decides whether this adapter can fully seat on your shaft. If the available shaft length is shorter than this depth the adapter will bottom out before the clamp screw engages properly. Verify the shaft exposure on your equipment before ordering.

Highlights

  • Adapts 1 3/8 in bore to 1 1/8 in shaft for flexible mounting
  • Black oxide finish on ASTM A108 steel resists corrosion in harsh environments
  • Precision bore tolerance of +.003/-.000 ensures accurate alignment
  • ASTM A574 grade screws provide high-strength clamping force
  • Compact 5 in overall length fits tight machine spaces

Specifications

No published specifications for this item yet.

Questions about this item

Which bore diameter should I choose for a 1 3/8 inch shaft?

This adapter has a single bore diameter of 1 3/8 inches with a tolerance of +0.003/-0.000 inches, so it fits shafts held to that tolerance.

What does the 2 3/8 inch outside diameter mean when the adapter is mounted?

The 2 3/8 inch outside diameter determines the space the adapter occupies on the shaft and the clearance needed for adjacent components.

How does the 1/4-28 set screw thread affect holding power?

The 1/4-28 thread on a 3/4 inch long steel screw (ASTM A574) provides secure clamping onto the shaft when tightened.

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