For most, its hard to identify the grade or strength of a bolt by looking at it unless you know the labelling.
Here's the rule of thumb:
- no markings on the head = Grade 1 or 2.
- 3 marks = Grade 5
- 6 marks = Grade 8
For a more complete identification list:
Download the hardware identification chart here
Attachment | Size |
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Hardware Bolt and Nut Grade Identification | 0 bytes |