Metric Fasteners - Socket Screw Hex Key and Nut Wrench Size

We highly recommend measuring metric screws by the screw thread diameter, but there are situations that come up where you might need to measure a screw size based upon limited information. Here we address two useful ways to find the screw size, or at least get you close enough that you can make an informed decision abo

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939531-1 Socket Head Cap Screw: M24-3.00 Tr Size, 100 mm Lg, 19 mm

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10.9 Alloy Steel Material, 0.8mm Thread Pitch, Hex Key Hex Socket Countersunk Flat Head Key Bolts Screws M5 x 20mm., Countersunk bolts is

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Hex key - Wikipedia