Wilson-Garner manufactures Test Bolts and stocks Test Nuts and Test Washers for several General Motors tests, including torque-tension, bearing surface, coefficient of friction, and torsional yield tests. Test products need to be uniform from test to test, so we hold ourselves to exacting quality standards to ensure that you get consistent testing results time after time. In addition, based on customer feedback, we go the extra mile by re-rolling the threads on all of our test bolts after heat treat and surface finish to eliminate nicks or plating inconsistencies. We provide parts that conform to requirements of the following General Motors Engineering Standards:
- GMW3044
- GMW3359
- GMW16722
- GM7112M
- GMW4707
- GMW3179 Code G
- GM6076M
- GM6124M
- GM6175M
- GM6189P
- GM6194
- GMW25
Torque/Tension Certification Testing
GM7112M, GMW4707, & GMW3179 Code G
| Thread Size | Test Bolt Part Number | Test Nut Part Number | Test Washer Part Number |
| M6 x 1.00 | 11516103 | 11516088 | 11503952 (SFM006HZ) |
| M8 x 1.25 | 11516104 | 11516089 | 11502643 (SFM008HZ) |
| M10 x 1.50 | 11516105 | 11516090 | 11502644 (SFM010HZ) |
| M12 x 1.75 | 11516106 | 11516091 | 11502645 (SFM012HZ) |
| M14 x 2.00 | 11516107 | 11516092 | 11502646 (SFM014HZ) |
| M16 x 2.00 | 11516108 | 11516093 | 11502647 (SFM016HZ) |
GMW 3044 / GMW 3359
| Test Bolt Part Number | Test Nut Part Number | Test Washer Part Number |
| 11516105 | 11516090 | 11502644 (SFM010HZ) |
| M10 x 1.50 x 40mm Class 9.8 Plain Finish | M10 x 1.50 Style 1 Zinc Finish | Zinc Finish Square Test Washer Hardened |
Bearing Surface Characteristics Testing
GMW 3359
| Test Bolt Part Number | Test Nut Part Number | Test Washer Part Numbers | |
| 11570102 | 11516090 | SFM010ALUM | SFM010SCEC |
| M10 x 1.50 x 60mm Class 10.9 – M14 Head Plain Finish | M10 x 1.50 Style 1 Zinc Finish | M10 Square Aluminum | M10 Square ELPO Finish |
Coefficient of Friction Testing
GMW 3044 / GMW 3359 – per ISO 16047
| Test Bolt Part Number | Test Nut Part Numbers | Test Washer Type HL Part Number | Test Washer Type HH Part Number |
| HHM10150060-WZ102 | 11611982 or 11611982-S437 | 11611945 | NPN4 |
| M10 x 1.50 x 60mm Class 10.9 16mm Head Plain Finish | M10 x 1.50 Class 10 Plain Finish or Zinc S437 Finish | M10 Square Washer Type HL Plain Finish | M10 Square Washer Type HH Plain Finish |