Partial Thread vs Full Thread Bolts

Which One Should You Choose? Heres What You Need to Know

When selecting bolts for your structural or mechanical projects, many buyers ask:
Should I go with partial-thread or full-thread bolts?
In this article, LST Group breaks down the differences to help you make the right decision.


Partial Thread Bolt (DIN 931)

Features:

• Smooth shank between the head and the threaded portion
• Standardized under DIN 931 (For Hex Bolt)
• Typically found with threads covering only part of the length
  

• Structural steel assemblies where the shank acts as a dowel to tightly secure two components
• Applications under high shear stress, such as beams, columns, or heavy machine frameworks
• Situations where threads inside the hole may reduce the connection strength

Full Thread Bolt (DIN 933)

Features:

• Threads run from under the head all the way to the tip
• Complies with DIN 933 standard (For Hex Bolt)
• Often used with nuts and washers in flexible assembly work
  

Ideal For:

• General-purpose fastening that requires adjustable engagement at multiple positions
• Repair, maintenance, woodwork, or installation where high shear stress is not a concern
• Situations where grip length is not critical and threading across the full body is preferred
  

So Which One is Right for You?

• If youre working on permanent steel structures, machinery, or load-bearing joints go for DIN 931 Partial Thread Bolts.
• If you need a flexible solution for general fixing, maintenance, or multi-position adjustment choose DIN 933 Full Thread Bolts.

Need Expert Advice?
Still unsure which one to pick?
Feel free to reach out to our bolt specialists:

• Line: @leesoonthai
• Facebook: LST Group - ทุกคำตอบของสกรูน๊อต
• Call us at: +66 2 8182555
• Website: https://grouplst.com
• E-mail: leesoonthai@gmail.com