Bolt

[bbrees]

Anyone determine what the definition/properties of this bolt is???
3/4 x 4 CS-N-LW

[FredGarvin]

a 3/4-4? That's one coarse thread. It's definitely not a UN series thread. Can you tell us what context you are seeing this callout? What is it used in, etc...

[mgb_phys]

a 3/4-4? That's one coarse thread.
Thats what I thought, is there an alternate way of specifying threads in the US? Does 4 on it's own imply MIL?

Or it could be rebar,thats about 3/4-4!

[jasc15]

Could it be an ACME thread? Lead or ball screws with 4 turns per inch are pretty common. The CS-N-LW could just be the manufacturer's material & finish specifications.

[TVP45]

Do you actually have one of these or just the description? If just the description, is there any possibility that this refers to a vacuum fitting?

[FredGarvin]

Could it be an ACME thread? Lead or ball screws with 4 turns per inch are pretty common. The CS-N-LW could just be the manufacturer's material & finish specifications.
I too thought about that, but, from what I saw, 3/4" starts at 5 TPI.