0.5 inch 081 Steel Chain Sprockets

A narrow version of our 08B heavy duty sprockets suitable for use with simplex 081 bicycle type chain in our most popular sizes. Sizes we do not stock at technobots are available through our gearsandsprockets website that offers a far greater range of transmission components.

These sprockets are supplied with a pilot bore that can be machine to a larger accurate diameter (subject to boss size) although many users find the pilot bore quite acceptable. Using our 'Custom Machining' service, we can not only bore out these sprockets but also drill and tap for set (grub) screw fixing. See the 'Custom Machining' tab with each product for more information.

Nominal tooth width: 1/8"
Boss width: 14 to 25mm depending on sprocket size

81Pitch 1/2"
Bore size is subject to change from table below, if bore size is critical then select 'Custom Bore Size' with bore required when making purchase.
Overall Width 'A' See Below
Tooth Width 'B1'1/8"
TeethDiameter 'de'PCD Ø 'dp'Boss Ø dmBore Ø 'D1'Overall Width
TeethDiameter 'de'PCD Ø 'dp'Boss Ø dmBore Ø 'D1'Overall Width
837.233.1821814
2410397.29601220
941.537.1325814
25107.1101.33601220
1046.241.128814
26111.2105.36701620
1149.645.0731816
27115.4109.4701620
1253.949.0735816
28119.4113.42701620
1358.453.0639816
29123.4117.46701620
1462.857.0743816
30127.5121.5701620
1566.861.0947816
31131.5125.54701620
1670.965.1501018
32135.5129.56701620
1774.969.11501018
33139.6133.6701620
1878.973.14501018
34143.6137.64701620
1982.977.16501018
35147.6141.68701620
2086.981.19501018
36151.7145.72701625
219185.22601220
37155.7149.76701625
229589.24601220
38159.8153.8701625
239993.27601220
40167.8161.87701625
£1.86 (£2.23 UK, incl VAT)
4808-108
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£3.18 (£3.82 UK, incl VAT)
4808-110
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£3.42 (£4.10 UK, incl VAT)
4808-112
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£4.40 (£5.28 UK, incl VAT)
4808-115
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£4.88 (£5.86 UK, incl VAT)
4808-116
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£5.48 (£6.58 UK, incl VAT)
4808-117
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£6.02 (£7.22 UK, incl VAT)
4808-118
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£7.86 (£9.43 UK, incl VAT)
4808-120
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock
Dispatched within 2-5 working days

£13.34 (£16.01 UK, incl VAT)
4808-130
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock

£20.86 (£25.03 UK, incl VAT)
4808-140
A 1/2" pitch sprocket that is a narrow version of our 08B range, use with the 081 type chain For dimensions and full product description, see here ....
In stock
Dispatched within 2-5 working days