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| 
 British Standard WSA-1; WSA2 & WSK-1; WSK-2 Attachments Roller Chains  | 
|||||||
| 
 Chain  | 
 Pitch  | 
 I  | 
 R  | 
 Q  | 
 J  | 
 L  | 
 O  | 
| 
 P  | 
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| 
 mm  | 
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| 
 08B  | 
 12.700  | 
 23.30  | 
 12.70  | 
 13.35  | 
 18.90  | 
 1.60  | 
 4.30  | 
| 
 10B  | 
 15.875  | 
 29.58  | 
 15.88  | 
 16.50  | 
 22.95  | 
 1.70  | 
 5.30  | 
| 
 12B  | 
 19.050  | 
 34.05  | 
 19.05  | 
 21.45  | 
 28.60  | 
 1.85  | 
 6.40  | 
| 
 16B  | 
 25.400  | 
 46.40  | 
 25.40  | 
 23.15  | 
 34.00  | 
 3.10  | 
 6.40  | 
Note: check attachment dimensions before ordering since manufacturing standards may vary