How To Measure Thread Size Metric. 2.) second, use a thread pitch gauge to identify the number of threads per inch. Use a ruler or measuring tape to measure from one side of a thread to the other in mms.
Metric thread sizes are specified by diameter and pitch, which is the space between threads. This section contains tables of sizes for metric thread hardware. Thread length (15mm) to measure length, start from right below the head, including any shank, and measure to the tip.
For example a m5x10 bolt has a 5mm shaft diameter and is 10mm long from the bottom of the head to the end of the fastener.
The following formula can be used to calculate an estimate of the bolt head sizes and gauge. They are also known as cga (compressed gas association) nuts and inlet nuts. This is really important and a common mistake made. Us and metric thread sizes mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180.