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Black oxide steel step-up adapter with 7/8 inch bore and 1 1/8 inch shaft

Climax Metal Products

Climax Metal Products SUA-087 Step Up Adapter 7/8 In Bore

SKU CH-CFQA-Q6ZJ9

A step-up adapter that converts a 7/8 in bore to a 1 1/8 in shaft using a clamp-on design with black-oxide finished steel construction

  • TypeCouplings, Collars & Adapters
  • Steps up 7/8 in bore to 1 1/8 in shaft
  • Black oxide steel resists corrosion per ASTM A108
  • Precision bore tolerance +.003/-.000 ensures tight fit
  • Hardened alloy steel screw meets ASTM A574 grade
  • Compact 4 3/8 in length suits tight assemblies

Product Identity

The Climax Metal Products SUA-087 is a steel step-up adapter designed to connect a 7/8 inch bore to a 1 1/8 inch shaft. It suits maintenance technicians and machine-shop personnel who need a clamp-on coupling for power-transmission assemblies.

Installation Notes

The clamp-on design uses a 1/4-28 set screw measuring 5/8 inch long, allowing the adapter to slide onto the shaft before tightening. Correct alignment of the bore and shaft tolerances is critical; forcing the fit or over-torquing the screw can damage the black-oxide finish or distort the bore.

Critical Specification

The adapter accepts a 7/8 inch bore with a +0.003/-0.000 tolerance and steps up to a 1 1/8 inch shaft diameter held to -0.000/-0.003 tolerance. Buyers needing a different bore size, a step-down configuration, or a non-clamp mounting method must select another part.

Highlights

  • Steps up 7/8 in bore to 1 1/8 in shaft
  • Black oxide steel resists corrosion per ASTM A108
  • Precision bore tolerance +.003/-.000 ensures tight fit
  • Hardened alloy steel screw meets ASTM A574 grade
  • Compact 4 3/8 in length suits tight assemblies

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

How can I confirm the SUA-087 adapter is seated correctly on a 7/8 inch shaft?

The bore tolerance is +.003/-.000 and the shaft tolerance is -.000/-.003, so a proper fit shows no axial play and the clamp screw seats fully at 5/8 in.

What components are included with the SUA-087 and what must I supply?

The adapter body, clamp screw (1/4-28 x 5/8 in) and black-oxide finish are included; you must provide the 7/8 in shaft and any driven component that mounts to the 1 1/8 in output shaft.

Which SUA-087 variant should I choose for a 7/8 inch input and 1 1/8 inch output?

This single model SUA-087 is specified for exactly that step-up ratio: 7/8 in bore diameter, 1 1/8 in shaft diameter, 4 3/8 in overall length.

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