Thread Gages
Companies looking for the top quality fixed limit gages on the market need look no further than Gage Assembly Company. Since our founding in 1953, we have been manufacturing standard and special thread plug and thread ring gages for nearly every thread type. These include the following:
- Metric thread gages
- American inch thread gages
- ACME
- Straight and tapered pipe thread gages
- Left hand
- Pre-plate
- Buttress
- Multiple lead thread plugs and rings
- Whitworth
- DIN – German specifications
- JIS – Japanese Industrial Standard
We can produce gages with capabilities running between 000-120 threads per inch to 15 ½ inch diameter and one thread per inch.
This page will explain thread gauges, the different types available from Gage Assembly, and their common applications.
What Is a Thread Gauge?
Thread gauges can sometimes be referred to as fixed limit thread gages. They are specialized tools that precisely measure the acceptable tolerance limits of part dimensions.
Thread gauges come in two primary types: plug gauges and ring gauges. Plug gauges are inserted into the threaded hole to measure internal threads, while ring gauges are fitted over external threads to measure them. Each of these types is available in GO and NO GO versions. GO gauges confirm that threads meet the minimum size requirement, while NO GO gauges ensure that threads do not exceed the maximum size specified.
Types of Thread Gauges
Thread gauges come in several types to fulfill various purposes. Here are some of the primary types of thread gauges we provide at Gage Assembly and their primary use cases.
- Plug gauges: Used to measure internal threads and assess whether the dimensions of holes meet specified tolerance limits.
- Ring gauges: Designed to measure external threads on pins, shafts, or studs. Ring gauges also follow the GO/NOT GO format.
- STI (screw thread insert) gauges: Used in applications requiring a screw thread insert. Widely used in the automotive industry.
Applications of Thread Gauges
Thread gauges are essential tools across multiple industries that require extreme precision. Here are some of the primary applications companies use Gage Assembly thread gauges for:
- Manufacturing. Thread gauges are vital to quality control, tooling, and setup verification. Manufacturing companies can also use thread gauges for maintenance and repair applications to assess worn threads and make decisions about replacing parts.
- Construction. In construction, thread gauges verify that fasteners and threaded holes are compatible. They are also used in pipe and fitting installations to verify that threading is correct.
- Automotive. Thread gauges are essential in engine and component assembly in the automotive industry. They ensure that parts conform to close tolerance specifications.
- Aerospace. Thread gauges are also critical in aerospace applications, where precision is essential for safety critical components.
- Medical. Even small deviations in thread dimensions can lead to bad parts, making accurate thread measurement a necessity in the manufacturing of medical devices.
Choose Thread Gages from Gage Assembly
Thread gauges are indispensable tools across industries, from manufacturing and construction to aerospace and medical. Whether measuring internal or external threads, thread gauges play a critical role in quality assurance and precision.
If you have a part with an unusual external or internal thread size or special pitch diameter, Gage Assembly can help. We offer standard gages in stock and fast delivery on special-order thread gages, including adjustable thread rings and thread setting plugs. Contact us today to learn more about how we can meet your needs!
Find Your Right Gage and Order Today
| Nominal Size | Handle Size |
|---|---|
| .060 0 – 80 | 000 |
| .073 1 – 64 | 000 |
| .073 1 – 72 | 000 |
| .086 2 – 56 | 000 |
| .086 2 – 64 | 000 |
| .099 3 – 48 | 000 |
| .099 3 – 56 | 000 |
| .112 4 – 40 | 00 |
| .112 4 – 48 | 00 |
| .125 5 – 40 | 00 |
| .125 5 – 44 | 00 |
| .138 6 – 32 | 00 |
| .138 6 – 40 | 00 |
| .164 8 – 32 | 0 |
| .164 8 – 36 | 0 |
| .190 10 – 24 | 0 |
| .190 10 – 32 | 0 |
| .216 12 – 24 | 0 |
| .216 12 – 28 | 0 |
| 1/4 – 20 | 1 |
| 1/4 – 28 | 1 |
| 5/16 – 18 | 1 |
| 5/16 – 24 | 1 |
| 3/8 – 16 | 2 |
| 3/8 – 24 | 2 |
| 7/16 – 14 | 2 |
| 7/16 – 20 | 2 |
| 1/2 – 13 | 2 |
| 1/2 – 20 | 2 |
| 9/16 – 12 | 3 |
| 9/16 – 18 | 3 |
| 5/8 – 11 | 3 |
| 5/8 – 18 | 3 |
| 3/4 – 10 | 3 |
| 3/4 – 16 | 3 |
| 7/8 – 9 | 4 |
| 7/8 – 14 | 4 |
| 1 – 8 | 4 |
| 1 – 12 | 4 |
| 1 – 14 | 4 |
| 1-1/8 – 7 | 4 |
| 1-1/8 – 12 | 4 |
| 1-1/4 – 7 | 5 |
| 1-1/4 – 12 | 5 |
| 1-3/8 – 6 | 5 |
| 1-3/8 – 12 | 5 |
| 1-1/2 – 6 | 5 |
| 1-1/2 – 12 | 5 |
| Nominal Size | Handle Size |
|---|---|
| M 1.6 x 0.35 | 000 |
| M 2 x 0.4 | 000 |
| M 2.5 x 0.45 | 000 |
| M 3 x 0.5 | 00 |
| M 3.5 x 0.6 | 00 |
| M 4 x 0.7 | 0 |
| M 5 x 0.8 | 0 |
| M 6 x 1.0 | 1 |
| M 8 x 1.25 | 1 |
| M 8 x 1.0 | 1 |
| M 10 x 1.5 | 2 |
| M 10 x 1.25 | 2 |
| M 10 x 1.0 | 2 |
| M 10 x 0.75 | 2 |
| M 12 x 1.75 | 2 |
| M 12 x 1.5 | 2 |
| M 12 x 1.25 | 2 |
| M 12 x 1.0 | 2 |
| M 14 x 2.0 | 3 |
| M 14 x 1.5 | 3 |
| M 15 x 1.0 | 3 |
| M 16 x 2.0 | 3 |
| M 16 x 1.5 | 3 |
| M 17 x 1.0 | 3 |
| M 18 x 1.5 | 3 |
| M 20 x 2.5 | 3 |
| M 20 x 1.5 | 3 |
| M 20 x 1.0 | 3 |
| M 22 x 2.5 | 4 |
| M 22 x 1.5 | 4 |
| M 24 x 3.0 | 4 |
| M 24 x 2.0 | 4 |
| M 25 x 1.5 | 4 |
| M 27 x 3.0 | 4 |
| M 27 x 2.0 | 4 |
| M 30 x 3.5 | 5 |
| M 30 x 2.0 | 5 |
| M 30 x 1.5 | 5 |
| M 33 x 2.0 | 5 |
| M 35 x 1.5 | 5 |
| M 36 x 4.0 | 5 |
| M 36 x 2.0 | 5 |
| M 39 x 2.0 | 5-1/2 |
Inch
| Nominal Size | Handle Size |
|---|---|
| 12 – 32 | 0 |
| 1/4 – 32 | 1 |
| 5/16 – 32 | 1 |
| 3/8 – 32 | 2 |
| 7/16 – 28 | 2 |
| 1/2 – 28 | 2 |
| 9/16 – 24 | 3 |
| 5/8 – 24 | 3 |
| 11/16 – 24 | 3 |
| 3/4 – 20 | 3 |
| 13/16 – 20 | 3 |
| 7/8 – 20 | 4 |
| 15/16 – 20 | 4 |
| 1 – 20 | 4 |
| 1-1/16 – 18 | 4 |
| 1-1/8 – 18 | 4 |
| 1-3/16 – 18 | 5 |
| 1-1/4 – 18 | 5 |
| 1-5/16 – 18 | 5 |
| 1-3/8 – 18 | 5 |
| 1-7/16 – 18 | 5 |
| 1-1/2 – 18 | 5 |
