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![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81501-large_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81501-thickbox_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81499-thickbox_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81210-thickbox_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
Manufacturer
Dunlop
Dunlop
Country of origin
United Kingdom
United Kingdom
Application:
The sprocket with a hub (for further processing) for Simplex roller chain can be prepared for any type of connection to the shaft through the draft holes. The sprocket can be mounted on the shaft with a key, a tapered bush or clamping bush, and so on.
Features:
Conforms to international standards DIN 8187 - ISO / R 606.
Type of material C45 or FE50.
Drawings
![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81210-large_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
Parameters
Weight, W
8.75 kg
Bore diameter, d
25 mm
Outside diameter, D
228.2 mm
Number of teeth, Z
21
Pitch, P
31.75 mm
Height, H
55 mm
Hub diameter, Dh
140 mm
![Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]](https://ebearing.com.ua/81501-home_default/sprocket-z21-dunlop-for-20b-1-simplex-roller-chain-pitch-3175mm-with-hub-for-bore-fitting.jpg "Plain bore roller chain sprocket 20B-1 - pitch 31.75mm, 21 Teath [Dunlop]")
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