SAE Housing and Flywheel Sizes
The following graphic shows the typical configuration and their respective SAE denomination
Dimensions
Standard SAE Dimensions
in inches and (millimeters)
Engine Flywheel Housing Dimensions
| Tapped Holes | ||||
|---|---|---|---|---|
| SAE No. | XD | XB | Qty | Size |
| 00 | 31.000 (787) | 33.50 (851) | 16 | 1/2-13 |
| 0 | 25.500 (648) | 26.75 (679) | 16 | 1/2-13 |
| 1/2 | 23.000 (584) | 24.38 (619) | 12 | 1/2-13 |
| 1 | 20.125 (511) | 20.88 (530) | 12 | 7/16-14 |
| 2 | 17.625 (448) | 18.38 (467) | 12 | 3/8-16 |
| 3 | 16.125 (410) | 16.88 (429) | 12 | 3/8-16 |
| 4 | 14.250 (362) | 15.00 (381) | 12 | 3/8-16 |
| 5 | 12.375 (314) | 13.12 (333) | 8 | 3/8-16 |
| 6 | 10.500 (267) | 11.25 (286) | 8 | 3/8-16 |
Engine Flywheel Dimensions
| Tapped Holes | |||||
|---|---|---|---|---|---|
| Size | XE | XF | XG | Qty. | Size |
| SAE 21 | 26.500 (673) | 25.25 (641) | 0 (0) | 12 | 5/8-11 |
| SAE 18 | 22.500 (572) | 21.38 (543) | .62 (16) | 6 | 5/8-11 |
| SAE 14 | 18.375 (467) | 17.25 (438) | 1.00 (25) | 8 | 1/2-13 |
| SAE 11-1/2 | 13.875 (352) | 13.12 (333) | 1.56 (40) | 8 | 3/8-16 |
| SAE 10 | 12.375 (314) | 11.62 (295) | 2.12 (54) | 8 | 3/8-16 |
| SAE 8 | 10.375 (264) | 9.62 (244) | 2.44 (62) | 6 | 3/8-16 |
| SAE 7-1/2 | 9.500 (241) | 8.75 (222) | 1.19 (30) | 8 | 5/16-18 |
| SAE 6-1/2 | 8.500 (216) | 7.88 (200) | 1.19 (30) | 6 | 5/16-18 |
To determine the SAE adaption in your specific application, simply match dimensions XD, XB, XE, XF and XG to arrive at a combination of SAE adaptions for the engine housing and for the engine flywheel, i.e.: SAE#1 Flywheel Housing with SAE#14 Flywheel.
