Frequently Asked Questions

Gage Questions and Answers

Q: Does Gage Assembly manufacture Acme thread gages?

A: Yes, Gage Assembly manufactures both Acme thread plug gages and Acme thread ring gages. You can find a list of our products on our Products Page.

Q: What are Acme thread gages?

A: Acme thread gages are designed to check internal and external Acme threads. Acme threads consist of 29 degree included thread forms. There are two general applications of Acme thread. They are: general purpose and centralizing. The three most common classes of Acme thread for general purpose are 2G, 3G, and 4G. Class 2G Acme thread tends to be the preferable selection of the three. The three most common classes of Acme thread for centralizing are 2C, 3C, and 4C. Class 2C Acme thread tends to be the preferable selection of the three. Both Acme 2G and 2C provide maximum end play or backlash.

Q: I have an ANPT thread plug gage. What does ANPT stand for?

A: ANPT – Army and Navy Aeronautical Tapered Pipe Thread

Q: Does Gage Assembly manufacture gages ring and plug for NPSM thread?

A: Yes, Gage Assembly manufactures gages both rings and plugs for NPSM thread. NPSM – National (American) Standard Pipe Straight Mechanical. This is a straight pipe thread required for mechanical assemblies.

Q: How can I learn more about the types of gages we need?

A:There are a number of great resources available to learn more about gages and plugs. You can learn about the basics of gages and plugs through one of our posts: Thread Gages 101. You can also talk with us at Gage Assembly by calling us at 1-800-232-GAGE.