Anyone determine what the definition/properties of this bolt

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SUMMARY

The discussion centers on the definition and properties of a bolt specified as "3/4 x 4 CS-N-LW." Participants clarify that this designation indicates a coarse thread, not a UN series thread. The conversation explores alternative specifications, including the possibility of it being a rebar or an ACME thread, particularly in applications involving lead or ball screws with four turns per inch. The CS-N-LW designation likely refers to the manufacturer's material and finish specifications.

PREREQUISITES
  • Understanding of bolt thread specifications, including coarse and UN series threads.
  • Familiarity with ACME thread standards and their applications.
  • Knowledge of material specifications in manufacturing, particularly CS-N-LW.
  • Basic concepts of lead and ball screws in mechanical engineering.
NEXT STEPS
  • Research the differences between coarse threads and UN series threads in fasteners.
  • Learn about ACME thread specifications and their industrial applications.
  • Investigate the material and finish specifications denoted by CS-N-LW.
  • Explore the use of lead and ball screws in machinery and their threading standards.
USEFUL FOR

Mechanical engineers, manufacturing professionals, and anyone involved in specifying or using threaded fasteners in industrial applications.

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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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