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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