We are offering ansi standard roller chain. Single and multiple strand tsubaki standard 80th series roller chains conform to the ansi (american standard institute) and are interchangeable with other chains conforming to ansi standards. The tsubaki 80th series roller chains celebrate tsubaki's 80 year history of constantly improving quality and customer satisfaction. dimensions-mm chain no. Ansi no. Pitch p roller dia.r width between roller link plates w rs25^* 25 6.35 3.30 3.18 rs35^* 35 9.525 5.08 4.78 rs41* 41 12.70 7.77 6.38 rs40* 40 12.70 7.92 7.95 rs50* 50 15.875 10.16 9.53 rs60 60 19.05 11.91 12.70 rs80 80 25.40 15.88 15.88 rs100 100 31.75 19.05 19.05 rs120 120 38.10 22.23 25.40 rs140 140 44.45 25.40 25.40 rs160 160 50.80 28.58 31.75 rs180 180 57.15 35.71 35.72 rs200 200 63.50 39.68 38.10 rs240 240 76.20 47.63 47.63 dimensions-mm chain no. Ansi no. Pitch p roller dia.r width between roller link plates w rs25^* 25 6.35 3.30 3.18 rs35^* 35 9.525 5.08 4.78 rs41* 41 12.70 7.77 6.38 rs40* 40 12.70 7.92 7.95 rs50* 50 15.875 10.16 9.53 rs60 60 19.05 11.91 12.70 rs80 80 25.40 15.88 15.88 rs100 100 31.75 19.05 19.05 rs120 120 38.10 22.23 25.40 rs140 140 44.45 25.40 25.40 rs160 160 50.80 28.58 31.75 rs180 180 57.15 35.71 35.72 rs200 200 63.50 39.68 38.10 rs240 240 76.20 47.63 47.63 dimensions-mm chain no. Average tensile strength kn {kgf} maximum allowable load kn {kgf} approx. Mass kgm number of links per unit rs25^* 4.71 {480 } 0.64 {65 } 0.14 480 rs35^* 11.3 {1, 150} 2.16 {220 } 0.33 320 rs41* 11.8 {1, 200} 2.26 {230 } 0.41 240 rs40* 19.1 {1, 950} 3.63 {370 } 0.64 240 rs50* 31.4 {3, 200} 6.37 {650 } 1.04 192 rs60 44.1 {4, 500} 8.83 {900 } 1.53 160 rs80 78.5 {8, 000} 14.7 {1, 500} 2.66 120 rs100 118.0 {12, 000 } 22.6 {2, 300} 3.99 96 rs120 167.0 {17, 000 } 30.4 {3, 100} 5.93 80 rs140 216.0 {22, 000 } 40.2 {4, 100} 7.49 68 rs160 279.0 {28, 500 } 53.0 {5, 400} 10.10 60 rs180 370.0 {37, 700 } 60.8 {6, 200} 13.45 54 rs200 471.0 {48, 000 } 71.6 {7, 300} 16.49 48 rs240 686.0 {70, 000 } 99.0 {10, 100} 24.5 40