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
Steel sprocket, 25 teeth, black oxide finish, 1 inch bore with keyway

Tritan

Tritan 40BS25H 25-Tooth Sprocket Chain 40 Finished Bore Keyway

SKU CH-645D-S2P21

A 25-tooth steel sprocket for #40 chain with a 1-inch finished bore, keyway and two set screws included

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Precise power transfer with 25-tooth 40 chain sprocket
  • Secure shaft grip via 1/4 in keyway and two set screws
  • Corrosion-resistant black oxide finish on steel body
  • Exact fit guaranteed by 3.989 in pitch diameter
  • Compact hub profile only .716 in projection

Industrial Sprocket for #40 Chain

The Tritan 40BS25H is a finished-bore steel sprocket designed for single-strand #40 roller chain with a 1/2 inch pitch. It suits maintenance technicians and OEM assemblers replacing worn drive components on conveyors, packaging lines or agricultural equipment where a 25-tooth profile matches the original design.

Keyway Bore Simplifies Shaft Mounting

A 1 inch fixed bore with a 1/4 inch wide by 1/8 inch deep keyway and two set screws lets the sprocket lock onto a keyed shaft without additional machining. The 3 3/4 inch hub diameter and 0.716 inch projection provide full key engagement; installers must verify shaft diameter and key dimensions before pressing the hub into place.

Black-Oxide Steel Holds Up Under Continuous Drive

Black-oxide finished steel resists corrosion while the 4.26 inch outside diameter and 3.989 inch pitch diameter maintain correct chain wrap during extended operation. The single-strand, one-side hub configuration is intended for in-line drives rather than heavily offset or multi-strand arrangements that would exceed the hub projection.

Highlights

  • Precise power transfer with 25-tooth 40 chain sprocket
  • Secure shaft grip via 1/4 in keyway and two set screws
  • Corrosion-resistant black oxide finish on steel body
  • Exact fit guaranteed by 3.989 in pitch diameter
  • Compact hub profile only .716 in projection

Specifications

BrandTRITAN
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

How can I verify the sprocket is correctly installed and functioning?

After mounting on a 1 in shaft, the 25-tooth steel sprocket with 4.26 in outside diameter and 3.989 in pitch diameter should rotate freely and engage the #40 chain smoothly without binding.

What comes in the box and what must I source separately?

The package includes one finished-bore sprocket with 1/4 in wide by 1/8 in deep keyway and two set screws; you must supply the #40 roller chain, 1 in key stock, and shaft separately.

Which chain size and tooth count does this sprocket match?

It is built for #40 chain with 1/2 in pitch and has 25 teeth, giving a 3.989 in pitch diameter and 4.26 in outside diameter.

Also in this aisle

People compared these

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