What are screw thread sizes?

Measuring your screw thread helps you determine the correct screw size you need. Check out our quick guide on how to determine your screw thread size.
A guide to measuring your screws correctly.

Screw Identifier - Professional Series - Metal - (Metric)

A guide to machine screws

Basic Thread Concepts

Metric Screw Thread Chart, Tooling, Inc. - Axial Thread Rolling System - Metric Screw Threads

Self Tapping Screw Thread Dimensions (Metric)

Screw Thread Size and Tolerance Chart - Design

A guide to machine screws

RSVP Tooling, Inc. - Axial Thread Rolling System - Metric Screw Threads M Profile - 1.50 to 6.00 Pitch

Introduction to Nut and Bolt Sizes

Metric Thread Dimensions - Bolt Sizes Chart For M1.6 To M69 Screws - Accu