05/16/2026
Fastener Fun Fact Friday
Ever wonder what a screw size like 1/4-20 x 1.5" actually means?
Here's the breakdown:
• 1/4 = the major diameter of the screw
• 20 = threads per inch (thread pitch)
• 1.5" = the length of the fastener
Metric fasteners work a little differently. A size like M6 × 1.0 × 20mm means:
• M6 = 6 mm diameter
• 1.0 = distance between threads in millimeters
• 20 mm = length
Once you know the code, fastener sizing starts to make a lot more sense.
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