We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Stainless steel rigid coupling with keyway, plain finish

Climax Metal Products

Climax Metal Products RC-125-S-KW Stainless Steel Coupling

SKU CH-DRMN-MPD5S

Stainless steel rigid shaft coupling with 1 1/4 in bore, keyway and 750 in-lb torque rating

  • Stainless steel construction resists corrosion in harsh environments
  • One-piece set-screw design simplifies shaft alignment
  • Keyway width 1/4 in prevents rotational slippage
  • Rated for 750 in-lb torque at 1800 RPM
  • Clearance diameter 2.25 in fits standard shaft sizes

Rigid shaft coupling for 1 1/4 in shafts

The Climax Metal Products RC-125-S-KW is a one-piece stainless-steel coupling with a set-screw and keyway. It connects two 1 1/4 in diameter shafts in power-transmission assemblies. The plain finish resists corrosion in industrial environments. Builders needing a simple, high-strength link for inch-series shafts will find it suitable.

Stainless steel body with 2.25 in outside diameter

The coupling measures 4 in overall length and 2.25 in clearance diameter. A single 3/8 in.-16 set screw locks the bore, while a 1/4 in keyway prevents rotational slip. Stainless construction tolerates moisture and chemicals better than plain carbon steel. The compact profile fits tight machine frames without extra mounting hardware.

Replaces worn or undersized couplings

The 750 in-lb torque rating and 1,800 RPM limit suit moderate-load pumps, conveyors and gearboxes. Upgrade when an existing coupling shows fretting, keyway elongation or rust. The jump is worth it if the application demands stainless durability and a secure keyed connection at these torque and speed levels.

Highlights

  • Stainless steel construction resists corrosion in harsh environments
  • One-piece set-screw design simplifies shaft alignment
  • Keyway width 1/4 in prevents rotational slippage
  • Rated for 750 in-lb torque at 1800 RPM
  • Clearance diameter 2.25 in fits standard shaft sizes

Specifications

BrandCLIMAX METAL PRODUCTS

Questions about this item

What torque limit does the 3/8-16 set screw allow?

The coupling is rated for a maximum torque of 750 in-lb when the 3/8-16 set screw is properly tightened on the shaft.

What shaft diameter and keyway width does this coupling accept?

It fits a 1 1/4 inch bore with a 1/4 inch keyway, and the outside diameter measures 2.25 inches overall.

How do you install the set screw so it does not slip?

Align the keyway, tighten the 3/8-16 set screw directly onto the shaft key, then verify the 750 in-lb torque rating is not exceeded at up to 800 RPM.

More in Conduit

Similar items

Same shelf, same checkout — eight coins and a 30-minute rate lock.