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According to DIN ISO 606 (ex DIN 8187).
Material: Special chain steels, sinter metal bushes. Special treated pins. With cranked links the power and breaking loads of the chain are reduced by 20%.

SKU DIN / ISO-Nr. Pitch p x Inner Width b [mm] Pitch p x Inner Width b1 [in.] Weight [g]
12177004L 06 B-2 9,525 x 5,72 3/8 x 7/32 7
12577004L 08 B-2 12,7 x 7,75 1/2 x 5/16 18
12677004L 10 B-2 15,875 x 9,65 5/8 x 3/8 30
12777004L 12 B-2 19,05 x 11,68 3/4 x 7/16 47
12877004L 16 B-2 25,4 x 17,02 1" x 17,02 mm 137
12977004L 20 B-2 31,75 x 19,56 1 1/4 x 3/4 183
12977504L 24 B-2 38,1 x 25,4 1 1/2 x 1 343