Components subject to fasteners and hardware tests: All parts listed here.
Size and shape
| Test |
Description |
Target |
Tolerance |
| Drive size |
Use the appropriate hex or nut driver to check the drive size of screws and nuts. |
M3, M5, 5.5mm, 8mm, etc |
N/A |
| Screw length |
Measure the length of screws with digital calipers. |
See BOM spec. |
+/- 0.5mm |
| Threads |
Measure threads of screws and nuts using a thread guage |
See BOM spec. |
N/A |
| Head diameter |
Measure the diameter of screw heads with digital calipers. |
See BOM spec. |
+/- 0.2mm |
| Head height |
Measure the height of screw heads with digital calipers. |
See BOM spec. |
+/- 0.2mm |
| Nut height |
Measure the height of nuts with digital calipers |
See BOM spec. |
+/- 0.2mm |
Material and appearance
| Test |
Description |
Target |
Tolerance |
| Material |
Ensure the material is aluminum or stainless steel and will not rust by holding a magnet to the part. |
Aluminum or stainless steel (no magnetic attraction) |
Weak attraction to stainless steel is permissible. |
Function
| Test |
Description |
Target |
Tolerance |
| Threading |
Fasten screws and nuts to reference mating component to ensure thread size and quality. |
Components should thread together smoothly. Test 10 pieces. |
N/A |
| Locking |
Tighten locknuts onto a screw and try to remove by hand. |
Locknut should resist being removed. Test 3 pieces. |
N/A |