Anyone determine what the definition/properties of this bolt

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The discussion centers on the definition and properties of a bolt specified as 3/4 x 4 CS-N-LW, with participants questioning its thread type and application. The thread is identified as coarse, not conforming to the UN series, and the number "4" raises questions about its meaning, with some suggesting it could relate to military specifications. There is speculation that the bolt could be rebar or possibly an ACME thread, as lead or ball screws commonly feature four turns per inch. The CS-N-LW designation is thought to refer to the manufacturer's material and finish specifications. One participant notes that 3/4" typically starts at 5 threads per inch, adding to the confusion regarding the thread classification. Overall, the conversation reflects a search for clarity on the bolt's specifications and potential uses.
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Anyone determine what the definition/properties of this bolt is?
3/4 x 4 CS-N-LW
 
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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...
 
FredGarvin said:
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!
 


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.
 


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?
 


jasc15 said:
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.
 

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