S.A.E. Machining Dimensions

ap118Detailed are the internationally accepted standard S.A.E. taper dimensions. This standard is incorporated in the American Boat and Yacht Council (A.B.Y.C.) rules which are commonly used in Australia. All dimensions for S.A.E. taper standards are based on the SMALL end diameter of taper. The reason for this is so propellers of different hub length (eg different diameters) fitted to the same shaft diameter, will have the nut face in the same position on the shaft.

Standard S.A.E. Taper Dimensions

Shaft Machining

Propeller Machining



Shaft Diameter
Shaft
Small End
Diameter of Taper
Shaft
Taper
Length
Propeller
Small End
Diameter of Taper
Propeller
Keyway
Size
                A    B                C    D
0.750"0.6252.0000.6090.1875
0.875"0.7272.3750.7110.2500
1.000"0.8282.7500.8130.2500
1.125"0.9303.1250.9140.2500
1.250"1.0313.5001.0160.3125
1.375"1.1333.8751.1170.3125
1.500"1.2344.2501.2190.3750
1.750"1.4385.0001.4220.4375
2.000"1.6415.7501.6250.5000
2.250"1.8446.5001.828* 0.5625
2.500"2.0477.2502.0310.6250
2.750"2.2587.8752.2340.6250
3.000"2.4618.6252.4380.7500
3.250"2.6649.3752.6410.7500
3.500"2.86710.1252.8440.8750
3.750"3.07010.8753.0470.8750
4.000"3.27311.6253.2501.0000
4.500"3.82810.7503.7971.1250
5.000"4.25012.0004.2191.2500
5.500"4.67213.2504.6411.2500

NB - *0.500 keyway commonly used in Australia for 2.250" SAE