Measure ENGLISH REFERENCE GUIDE
Screw measurement guides
Start with the measurement you need: diameter, length, thread spacing or a reference chart.
These English-language guides support the measuring tool. Follow the steps, compare your readings and confirm the original specification before choosing a replacement.
How to measure screw diameter
Measure across the outside threads and compare nearby sizes without confusing the head, shank or thread root.
Read guide →How to measure screw length
Choose the correct seating point for pan, hex and countersunk heads before measuring to the tip.
Read guide →Metric screw size chart
Compare nominal diameters, inch conversions and common coarse pitches for M2–M16 machine screws.
Read guide →US machine screw size chart
Compare numbered and fractional machine screw diameters with UNC and UNF thread counts.
Read guide →How to measure thread pitch
Distinguish millimetres per thread from threads per inch and check similar-looking fasteners.
Read guide →Screw types: tip, thread, head and drive
Use visible features to narrow down a screw family and keep drive shape separate from intended use.
Read guide →Start with an unknown screw
- Measure its outside diameter and length.
- Check thread pitch and compare the metric or US chart.
- Inspect its tip, head and drive, then verify the intended use.
The screen gauge provides estimates. For close sizes, use calipers and a thread gauge.