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Deciphering Bolt Head Markings | Short Guide

Deciphering Bolt Head Markings | Short Guide

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.

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.
Deciphering Bolt Head Markings | Short Guide

EXPLAINING THE MEANING OF GRADE WRITTEN ON BOLT HEAD

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