Metric Question

[Sonor]

Pardon my ignorance, but do all threaded 6 mm bolts have the same thread size?  I mean the spacing between each thread, not the total amount thereof.

[Rougarou]

Just now, Sonor said:

Pardon my ignorance, but do all threaded 6 mm bolts have the same thread size?  I mean the spacing between each thread, not the total amount thereof.

 

McMaster-Carr has two pitches listed for M6.

[realshelby]

Called "Pitch". In all thread types. 

 

Metric threads are known to have some oddball pitches. So be very careful. Threads look right, even start ok. But quickly tighten and become galled. 

 

An M6 fastener will likely have a 1mm or .75 mm pitch. If you have a correct fastener, lay it into the threads of the one you want to check. If it fits into the threads all the way, it is the correct pitch.

[Joe Frickin' Friday]

41 minutes ago, realshelby said:

Called "Pitch". In all thread types. 

 

 

Metric thread standards specify pitch, e.g. an M6 x 1  screw has a thread pitch of 1mm.  Here's a chart listing the common metric thread standards from M1.6 through M18.

 

The Unified Thread Standard specifies threads per inch, e.g. a 1/4-20 screw has 20 threads per inch.  Here's a chart listing the common UTS thread standards from #0 through 2".

[Sonor]

I knew I could count on this forum for the facts.  Thanks everyone ...