Deciphering Bolt Head Markings | Short Guide

Name: Deciphering Bolt Head Markings | Short Guide
Uploaded: 2022-01-06T20:54:00+00:00
Channel: The Engineer
Description: Have you ever wondered what the markings on the head of a bolt mean? Maybe it's just a few lines or...| Deciphering Bolt Head Markings | Short Guide

The EngineerJanuary 6, 2022January 6, 20220
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Have you ever wondered what the markings on the head of a bolt mean? Maybe it’s just a few lines or a series of letters and numbers.

Table of Contents

The markings on bolt heads serve two different purposes:

1. The markings can indicate who manufactured the bolt.

This will vary from manufacturer to manufacturer, but is usually one, two or three characters.

2. The markings can identify the standard to which the bolt was made.

For instance:

If a bolt head contains three radial lines, then it’s a Grade 5 bolt. & if it contains five radial lines, then the bolt is Grade 8.

If the bolt is manufactured to a particular grade based on standards set by the American Society for Testing and Materials (ASTM), then the marking will show a combination of letters and numbers.