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SAE Flywheel Housing Identification

Dimensions in inches, unless otherwise specified.

SAE
Housing
No.
Pilot
Diameter
“A”
O.D.
“S”
Bolt
Circle
“R”
Housing
Face to
Crankshaft
“C”
Flywheel Housing Bolts and Bolt Holes “T”
Qty.Hole Dia.Bolt Size
025.50028.0026.7503.9416.5471/2
1/223.00025.5024.3753.9412.5471/2
120.12521.7520.8753.9412.4697/16
217.62519.2518.3753.9412.4333/8
316.12517.7516.8753.9412.4333/8
414.25015.8815.000*12.4333/8
512.37514.0013.125*8.4063/8
610.50012.1211.2502.818.4063/8

* 3.94 for 8″ clutch. 2.81 for 6.5″ and 7.5″ clutch.

SAE Flywheel Dimensions
Clutch
Size
Drive
Ring
Pilot
“K”
Bolt
Circle
“L”
Housing
Face to
Flywheel
“Y”
Pilot Bearing
Bore
“O”
Bolt Hole “M”
Qty.Size
6-1/28.507.8751.192.0472 (52mm)65/16
7-1/29.5008.7501.192.0472 (52mm)85/16
810.3759.6252.442.4409 (62mm)63/8
1012.37511.6252.122.8346 (72mm)83/8
11-1/213.87513.1251.562.8346 (72mm)83/8
1418.37517.2501.003.1496 (80mm)81/2
14-DP18.37517.2501.003.1496 (80mm)81/2
14-3P18.37517.2501.003.9370 (100mm)81/2
1822.50021.375.623.9370 (100mm)65/8
18-DP22.50021.375.623.9370 (100mm)65/8
18-3P22.50021.375.624.7244 (120mm)65/8
SAE Flywheel Dimensions
The above illustration is shown for identification of dimensions only.
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