The TSUBAKI RS25 standard sprocket is designed for the small RS25 roller chain used in light power transmission. Teeth mesh with the chain rollers for smooth, positive drive in a compact space. It is commonly used in office equipment, small conveyors, vending machines and light automation where a small chain pitch is preferred.
| Part No. |
Accessories |
Material |
No. of Teeth |
Bore Type |
Chain Pitch (mm) |
Tooth Width (mm) |
Type |
Approx. Mass (kg) |
No. of Strands |
Set Screw |
Pitch Diameter (Dp) (Ømm) |
Outer Diameter (Do) (Ømm) |
| RS25-1B17T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Iron-based sintered alloy |
17 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.045 |
1 |
(1 location) position H, 5mm |
34.56 |
37.5 |
| RS25-1B19T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Iron-based sintered alloy |
19 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.06 |
1 |
(1 location) position H, 5mm |
38.58 |
41.5 |
| RS25-1B21T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Iron-based sintered alloy |
21 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.08 |
1 |
(1 location) position H, 7mm |
42.61 |
45.5 |
| RS25-1B22T-10 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
22 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.084 |
1 |
(1 location) position H, 7mm |
44.62 |
48 |
| RS25-1B22T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
22 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.084 |
1 |
(1 location) position H, 7mm |
44.62 |
48 |
| RS25-1B23T-10 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
23 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.088 |
1 |
(1 location) position H, 7mm |
44.63 |
50 |
| RS25-1B23T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
23 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.088 |
1 |
(1 location) position H, 7mm |
46.63 |
50 |
| RS25-1B24T-8 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
24 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.093 |
1 |
(1 location) position H, 7mm |
48.65 |
52 |
| RS25-1B26T-12 |
+ pan head machine screw, 1 pc (stainless steel) |
Carbon steel for machine structural use |
26 |
Shaft bore finished type |
6.35 |
2.9 |
Sprocket |
0.098 |
1 |
(1 location) position H, 7mm |
52.68 |
56 |
Confirm the number of teeth, bore size and hub style. Please confirm the full part number and options against the TSUBAKI catalog; contact us if you need help identifying the right model.
Tsubakimoto Chain Co. (TSUBAKI) is a Japanese manufacturer and one of the world's leading makers of power transmission products, including roller and conveyor chains, sprockets, timing belts and pulleys, Power-Lock keyless locking devices, couplings, cam clutches, reducers and cable carriers.
