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Self-Tapping Screw Thread Types Explained: Type A, AB, B & Type 25
Easylink Technical Insights
Last Updated: September 8, 2026
Table of Contents
Self-Tapping Screw Thread Types Explained: Type A, AB, B & Type 25
How a Self-Tapping Screw Creates Its Own Thread
How Point Shape and Thread Spacing Affect Performance
The 4 Common Self-Tapping Thread Types
Type A: the original sharp-point design
Type AB: the modern all-rounder
Type B: the blunt-point workhorse
Type 25: the thread cutter for plastics
Compare Type A, AB, B, and 25 Side by Side
Matching Thread Type to Material
Preparing the Hole for the Type You Choose
How to Choose the Right Self-Tapping Thread Type
1. Will the material crack or deform?
2. How thick is the material relative to the screw?
3. How accurately is the hole being made?
4. Will the joint see vibration or be disassembled?
5. Is this a new design or a repair?
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