https://planetfasteners.com/blogs/fastener-resources/m3-vs-4-40-thread-not-interchangeable 2026-09-08T16:04:40-07:00 weekly https://cdn.shopify.com/s/files/1/0804/6012/0295/articles/m3-vs-4-40-real-thread-comparison-2026.jpg?v=1788908680 M3 or #4-40: why they are not interchangeable M3 and #4-40 socket head screws photographed side by side to compare their thread spacing https://planetfasteners.com/blogs/fastener-resources/thread-pitch-chart 2026-09-25T05:52:50-07:00 weekly https://cdn.shopify.com/s/files/1/0804/6012/0295/articles/thread-pitch-chart-measuring-screw-diameter.webp?v=1787866081 Screw Thread Pitch Chart: Metric, UNC & UNF Sizes Measuring a screw's outside diameter with digital calipers https://planetfasteners.com/blogs/fastener-resources/how-to-measure-a-screw 2026-10-14T03:41:40-07:00 weekly https://cdn.shopify.com/s/files/1/0804/6012/0295/articles/how-to-measure-m3-major-diameter-caliper.jpg?v=1789089034 How to Measure a Screw or Bolt: Diameter, Pitch and Length Digital caliper measuring the major diameter of an M3 A2 stainless socket head screw at 2.90 mm