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"Structural Bolts" vs. Grade 5 Bolts

2004

Can you tell me the difference between a Structural Bolt and a Grade 5 bolt of the same size?

I am a Mechanical Engineer working for a company that manufactures heavy duty, industrial shelving--all bolted together.

These shelving units are required to hold very large loads placed upon them.

I've noticed recently that when these units were originally designed, they were designed using "Structural Bolts" and, due to cost, I might like to change to Grade 5 Bolts.

I am concerned as to whether or not the structural integrity of the unit will be compromised.

Can you help?

Sincerely,

Michael G. Buckley
Material Handling - Prospect Heights, Illinois, USA

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Good morning:
If you know the material and physical properties of the "structural fasteners" you are currently using, you can compare them to the material and physical properties of grade 5 fasteners outlined in the latest revision of SAE J429. The SAE standards can be purchased from their website. Hope this provides you with some of the information you need.

Steve Bizub
- St Louis, Missouri
2004

If you mean ASTM A325 structural bolt. Then the mechanical properties are the same as a J429 Grade 5 bolts.

JIm Waddell
- Birmingham, Alabama
2004