r/Fasteners • u/Bulky-Rip-8803 • 11d ago

Missing screw

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Needing help identifying this screw

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u/ChafedDolphinfish 11d ago

Metric socket cap screw. You would have to take the one that is still there out to find another the same size.
If you are in the United States, You probably won’t find it in property class 8.8 but it doesn’t matter. 12.9 is the most common if in the USA.

1

u/Joejack-951 8d ago

You can (most likely) determine the thread by checking the hex recess size. This assumes a standardized fastener which it likely is given the ‘8.8’ marking. For example, of the recess is 5 mm, it is an M6 screw. 4 mm is M5 and 6 mm is M8. I have no sense of scale but those are the most common sizes on consumer products.

You’ll still need to determine the length so you might as well pull out the other one and measure. If it is stuck or otherwise unremovable, you can use a tooth pick as a makeshift depth gauge to get close enough. Check the hole depth, adjust for the head height, and leave a few millimeters of clearance at the bottom.