Interesting discovery about a Metric M6 bolt

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SUMMARY

The discussion reveals that an M6 x 1.0 thread bolt can be screwed into a hole tapped for a 1/4"-28 thread, indicating a compatibility between these two sizes. However, users caution against using the M6 bolt as a permanent solution due to significant clearance issues, which can lead to loosening over time. This compatibility may serve as a temporary fix, but it is not advisable for long-term applications. The conversation also raises questions about the existence of other types of M6 bolts beyond the standard metric version.

PREREQUISITES
  • Understanding of bolt thread standards, specifically metric and imperial systems.
  • Familiarity with M6 x 1.0 and 1/4"-28 thread specifications.
  • Knowledge of mechanical fastening principles and applications.
  • Basic skills in using tools for threading and fastening.
NEXT STEPS
  • Research the differences between metric and imperial thread standards.
  • Explore the implications of using mismatched bolt sizes in mechanical applications.
  • Learn about alternative fasteners that can provide better compatibility.
  • Investigate the various types of M6 bolts available in the market.
USEFUL FOR

Mechanical engineers, hobbyists in DIY projects, and anyone involved in fastening and assembly work who needs to understand bolt compatibility and standards.

CROSE85
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Today while working I found that an M6 x 1.0 Thread bold will easily screw into a hole tapped 1/4"-28.

At first when I found this, I thought one of my boxes of bolts was labeled wrong, but I tried another set and it work.

Has anyone else come across this similarity before?

-CR
 
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Yes I've noticed the same thing before, but it leaves a ton of clearance so the bolt tends to loosen up very quickly. It's not a very good idea to use the M6 in place of the 1/4-28 because of this, but it can work as a quick fix until you find the right bolt.
 
Anyone who does this has a screw loose.

(I couldn't resist.)
 
Is there any other type of M6 bolt besides a metric one?
 

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