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Made to ANSI B 29.3 specifications. These are characterized by the figure 8 contour link plates and are similar to the basic series roller chains dimensionally except that the pitch is double.
| ANSIChainNumber | ChainPitchP | InnerWidthW | RollerDia.D | d | L1 | L2 | Link PlateThicknessT | Approx.Weight(lbs./ft) | TensileStrengthAve.(lbs.) | ANSIChainNumber |
| A2040 | 1 | 5/16 | .312 | .156 | .68 | .76 | .060 | .28 | 3700 | A2040 |
| A2050 | 1-1/4 | 3/8 | .400 | .200 | .84 | .92 | .080 | .52 | 6100 | A2050 |
| A2060 | 1-1/2 | 1/2 | .469 | .234 | 1.05 | 1.11 | .094 | .72 | 8500 | A2060 |
| A2080 | 2 | 5/8 | .625 | .312 | 1.32 | 1.44 | .125 | 1.13 | 14500 | A2080 |