Part No. R12X4, R12X6, R16X6, R3X4, R4X4, R4X6, R5X6, R6X4, R6X6, R8X6, RA10X4, RA10X6, RA12X2, RA12X4, RA12X6, RA16X4, RA16X6, RA5X6, RA6X6, RA8X6, TR10X6, TR16X6, R8X4, RA8X4, R3x2', TR3x2', TR3x4', R3x6', TR3x6', R4x2', TR4x2', TR4x4', TR4x6', RA4x2', RA4x4', RA4x6', R5x2', TR5x2', R5x4', TR5x4', TR5x6', RA5x2', RA5x4', R6x2', RA6x2', TR6x2', RA6x4', TR6x4', TR6x6', R8x2', RA8x2', TR8x2', TR8x4', TR8x6', R10x2, RA10x2', TR10x2', TR10x4', R12x2', TR12x2', TR12x4', TR12x6', R16x2', R16x4', RA16x2', TR16x2', TR16x4', R20x2', TR20x2', R20x4', TR20x4', R20x6', TR20x6', R24x2', R24x4', R24x6'
Dimension table reproduced from the Amec gear & gear rack catalog, page F-31.