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 We have over 700 end of line + a few over stocked items available at discounted prices whilst stocks last. Look out for the them as you browse, download a complete PDF list or visit this page.


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

81 Pitch 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"
Teeth Diameter 'de' PCD Ø 'dp' Boss Ø dm Bore Ø 'D1' Overall Width
Teeth Diameter 'de' PCD Ø 'dp' Boss Ø dm Bore Ø 'D1' Overall Width
8 37.2 33.18 21 8 14
24 103 97.29 60 12 20
9 41.5 37.13 25 8 14
25 107.1 101.33 60 12 20
10 46.2 41.1 28 8 14
26 111.2 105.36 70 16 20
11 49.6 45.07 31 8 16
27 115.4 109.4 70 16 20
12 53.9 49.07 35 8 16
28 119.4 113.42 70 16 20
13 58.4 53.06 39 8 16
29 123.4 117.46 70 16 20
14 62.8 57.07 43 8 16
30 127.5 121.5 70 16 20
15 66.8 61.09 47 8 16
31 131.5 125.54 70 16 20
16 70.9 65.1 50 10 18
32 135.5 129.56 70 16 20
17 74.9 69.11 50 10 18
33 139.6 133.6 70 16 20
18 78.9 73.14 50 10 18
34 143.6 137.64 70 16 20
19 82.9 77.16 50 10 18
35 147.6 141.68 70 16 20
20 86.9 81.19 50 10 18
36 151.7 145.72 70 16 25
21 91 85.22 60 12 20
37 155.7 149.76 70 16 25
22 95 89.24 60 12 20
38 159.8 153.8 70 16 25
23 99 93.27 60 12 20
40 167.8 161.87 70 16 25

081 Steel Chain Sprocket 1/2" - 8T

Part No.: 4808-108

Shipping Weight: 40.00 g.

£1.51 (£1.81 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 10T

Part No.: 4808-110

Shipping Weight: 80.00 g.

£2.58 (£3.10 inc tax)
[Currently Unavailable]
No date for new stocks
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 .... Read More

081 Steel Chain Sprocket 1/2" - 12T

Part No.: 4808-112

Shipping Weight: 130.00 g.

£2.78 (£3.34 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 15T

Part No.: 4808-115

Shipping Weight: 232.00 g.

£3.57 (£4.28 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 16T

Part No.: 4808-116

Shipping Weight: 250.00 g.

£3.97 (£4.76 inc tax)
Out of Stock
Stocks Overdue
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 .... Read More

081 Steel Chain Sprocket 1/2" - 17T

Part No.: 4808-117

Shipping Weight: 320.00 g.

£4.45 (£5.34 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 18T

Part No.: 4808-118

Shipping Weight: 323.00 g.

£4.89 (£5.87 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 20T

Part No.: 4808-120

Shipping Weight: 330.00 g.

£6.40 (£7.68 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 30T

Part No.: 4808-130

Shipping Weight: 725.00 g.

£10.84 (£13.01 inc tax)
In stock
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 .... Read More

081 Steel Chain Sprocket 1/2" - 40T

Part No.: 4808-140

Shipping Weight: 1070.00 g.

£16.96 (£20.35 inc tax)
In stock
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 .... Read More

 

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