Types of Screw Threads

Screw Threads — Precision Fit for Reliable Fastening

The Screw Threads guide from Allfast Solutions NZ explains how thread design affects strength, grip, and performance. Every fastener relies on its thread profile to hold securely. Understanding how threads work helps you match the right screw or bolt to each material and application.

Threads come in many forms, and each serves a purpose. Fine threads deliver precision and higher strength in tension. Coarse threads drive faster and perform better in softer materials. With this screw threads guide, you can identify pitch, diameter, and fit quickly, ensuring clean engagement and reliable results every time.

Our Screw Threads page includes:

• Thread pitch charts for metric and imperial fasteners

• Guidance on fine vs coarse threading

• Information on UNC, UNF, and metric profiles

• Tips for identifying thread direction and angle

• Conversion tables for millimetres, TPI, and gauges

• Advice on thread repair and maintenance

Each chart is easy to read and formatted for on-site reference. You can check thread compatibility in seconds and avoid stripping or cross-threading. In addition, we outline how lubrication, coating, and torque influence thread performance under load.

At Allfast Solutions NZ, we combine product knowledge with practical guidance. We supply screws threads that meet ISO and AS/NZS standards, ensuring every thread fits as intended. Our goal is to make technical information simple, accurate, and useful for every tradesperson and engineer.

For more details on international thread specifications, visit the International Organization for Standardization (ISO). This standard defines how threads are measured and tested across global manufacturing.

In summary, this Screw Threads guide gives you the knowledge to select, install, and maintain fasteners with precision — helping you achieve secure, long-lasting connections.