1226585 | OR-31500-700-N70 (Pack of 10) --- General Purpose O-Rings - 315x7 mm - Black Nitrile Rubber Packs - Nitrile NBR, BUNA-N O-Ring 15.88x0.64x16.89 2-7/16 inch O-Ring - 61

2-7/16 inch O-Ring - 61

85 tooth - 170x4 mm Timing 2

178mm is 0

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1226585 | OR-31500-700-N70 (Pack of 10) --- General Purpose O-Rings - 315x7 mm - Black Nitrile Rubber Packs - Nitrile NBR, BUNA-N O-Ring 15.88x0.64x16.89 2-7/16 inch O-Ring - 61315x7 mm Black General Purpose O Rings Nitrile (NBR, BUNA N) Sold Per 10: Base Category: O Rings General Purpose Top Level Category: O Rings General Purpose Nitrile Rubber Packs Product Details Inside Diameter (ID): 315. 00mm (315. 00mm is 12. 402 in.) Nitrile (NBR, BUNA N) Inside Diameter (ID): 315. 00mm (315. 00mm is 12. 402 in.) Section (t): 7. 00mm (7. 00mm is 0. 276 in.) Colour: Black Hardness: 70 Durometer Brand: MBA Country of Origin: TW