https://planetfasteners.com/blogs/fastener-resources 2026-08-30T13:45:51-07:00 weekly https://planetfasteners.com/blogs/fastener-resources/m3-vs-4-40-thread-not-interchangeable 2026-08-28T15:02:44-07:00 weekly https://cdn.shopify.com/s/files/1/0804/6012/0295/articles/m3-vs-4-40-thread-comparison.png?v=1787870785 M3 or #4-40: why they are not interchangeable M3 and #4-40 machine screws beside a thread pitch gauge and digital calipers https://planetfasteners.com/blogs/fastener-resources/thread-pitch-chart 2026-08-28T15:02:43-07:00 weekly https://cdn.shopify.com/s/files/1/0804/6012/0295/articles/thread-pitch-chart-measuring-screw-diameter.webp?v=1787866081 Thread Pitch Chart: UNC, UNF & Metric Thread Sizes Measuring a screw's outside diameter with digital calipers