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#40 Roller Chain Sprocket Type B 3/4 inch Bore 21 Tooth, Hardened Antirust 1045 Steel Drive Sprockets 40B21-3/4

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$21.99

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  • Size information：American Standard ANSI #40,1/2 inch Pitch,3/4 inch Bore,21 Teeth,3/16X3/32 Keyway,2 Setscrews at 90 degrees,B Type,Suitable for #40 chain
  • The sprocket is made of ANSI 1045 carbon steel, and the teeth are hardened with HRC38-42 with high-frequency quenching heat treatment
  • The surface of the sprocket is blackened, and it is corrosion-resistant and rust-proof
  • The sprockets are easy to install, easy to maintain, and can maintain good and stable operation in harsh environments
  • Sprockets are widely used in power transmission in the fields of agricultural machinery, woodworking machinery and machine tools
  • Package Contents：1 x Roller Chain Sprocket,2 x Screws,1 x Wrench


Product Description

Roller Chain Sprocket
40B21-3/4

#40 Roller Chain Sprocket Type B 3/4 inch Bore 21 Tooth

Chains and sprockets need to match each other to function properly, and the following factors need to be considered when choosing a replacement sprocket:

1.style of sprocket.

Type A (Flat sprocket, no hubs)

Type B (1 Hub)

Type C (2 Hubs)

2.Sprocket bore size and keyway size

3.Number of sprocket teeth

4.If you select a sprocket according to the chain, you also need to check the chain pitch and roll diameter to confirm the chain model

#40 Roller Chain Sprocket 40B21-3/4

model number 40B21-3/4
Hub Style Type B
Number of Teeth 21
Inner diameter Size 3/4 inch
Keyway 3/16X3/32 inch
Material AISI 1045
Surface Treatment Black Oxide
Tooth hardness HRC38-42
Adaptable chains #40
Weight 1.76 Lbs

Product Details

Induction Hardening

Induction Hardening

The sprocket is made of ANSI 1045 carbon steel, and the teeth are hardened with HRC38-42 with high-frequency quenching heat treatment

40B2134

Surface Treatment & Mark

The surface of the sprocket is blackened, and it is corrosion-resistant and rust-proof.Each sprocket will be marked with the number of teeth and the size of the inner hole for ease of use

40B21X3/4

Other information

There are two screws for fastening and a Allen wrench

Application scenarios

scenarios