Questions tagged [threads]

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8
votes
1answer
3k views

Can nuts safely be removed from bolts where the threads have been intentionally damaged?

On old bridge plans I have occasionally seen a note to "burr threads after installation". This was done to keep the nuts of bolted connection from loosening all the way and falling off of the bolt. ...
11
votes
5answers
11k views

Why are most standard bolt threads single start?

When looking at thread descriptions, one of the basic properties is always the number of thread starts. As far as I could tell, all of the major standard bolt threads are single-start. This includes: ...
6
votes
1answer
3k views

Is the tolerance of pitch of a thread standarized?

As I was browsing ISO 965-1 it defines tolerances on a plenty of variables regarding metric threads, but it gives the pitch of the thread as a simple number from an allowed set ( 3 – 2 – 1,5 – 1– 0,75 ...
5
votes
2answers
145 views

How to let a “screw” leave and reenter a thread

The setup Consider a cylinder inside another cylinder (placed with their symmetry axis horizontal). The inner cylinder is about Ø100 mm in diameter and a centimeter or two in lenght/thickness. On ...
5
votes
2answers
6k views

What does “28” and “27” mean on my metric thread pitch gauge?

I have a metric thread pitch gauge that came in a tap and die set, it has pitches like $0.75$, $0.8$, $1.25$, etc. which is the distance between each thread. However there are two gauges that say $27$ ...

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