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This section provides an overview for screw thread gages as well as their applications and principles. Also, please take a look at the list of 15 screw thread gage manufacturers and their company rankings. Here are the top-ranked screw thread gage companies as of July, 2025: 1.Johnson Gage, 2.Thread Check Inc., 3.WESTport Corporation.
Table of Contents
A Thread Gauge is an inspection tool used to check if the male or female thread of a screw is manufactured in the correct shape.
A ring gauge is used to measure male threads. The shape of a screw is standardized, but there are various specifications. For example, thread outer diameter, effective diameter, thread pitch, and thread valley diameter.
Measuring these parameters one by one is time-consuming. However, using screw thread gauges, it is possible to quickly determine whether the manufactured screw shape is acceptable or not. Thread gauges are widely used in screw manufacturing.
Thread gauges are mainly used in the manufacturing of screws. Thread shapes are standardized, but there are various specifications.
For example, thread outer diameter, effective diameter, thread pitch, and thread trough diameter. Measuring these parameters one by one is time-consuming.
Screw thread gauges allow us to quickly determine whether the manufactured screw shape is good or bad. They are widely used in screw manufacturing because of their ability to improve operational efficiency.
The principle of thread gauge depends on the type used. Thread gauges commonly used in manufacturing are as follows:
The limit thread gauge is an inspection jig used to easily determine if a manufactured screw shape is acceptable or not. Using gauges made to the upper and lower limit specifications of the screw to be inspected, the shape is judged as good or bad by passing through one gauge and not the other.
For a male thread such as a bolt, the ring gauge on the upper end of the gauge will pass the ring gauge on the lower end of the gauge, but not the ring gauge on the lower end of the gauge.
If the product is a nut or other female thread, it will pass the plug gauge at the lower end of the gauge, but will not pass the plug gauge at the upper end. Also, the standard here refers specifically to the effective diameter of the screw.
The wear inspection thread gauge is a gauge used to guarantee the accuracy of the limit thread gauge. The limit screw thread gauge wears out as it is passed through the object to be inspected. As the amount of wear increases, it becomes impossible to make correct judgments.
Therefore, a thread gauge for wear inspection is used to check whether the limit screw thread gauge has not exceeded the wear limit for correct inspection. A ring gauge for wear inspection is used to inspect the wear of the limit screw plug gauge, and a plug gauge for wear inspection is used to inspect the wear of the limit screw ring gauge.
Thread gauges are made according to the standard thread profile and standard dimensions of the screw standard, and are a set of a plug gauge and a ring gauge. Thread gauges are the standard for measurement.
Compared to the limit screw thread gauge, the quality assurance accuracy is inferior. However, it is not necessary to prepare a set of both the thread side and the stop side like the limit screw thread gauge. This allows the cost to be kept low.
There are two main types of pipe screw thread gauges. There are two main types of pipe thread gauges: parallel thread gauges and tapered thread gauges.
The parallel thread gauges are used to measure the threads at the threaded end and the tapered end. Thread gauges for tapered threads are notched on the end face and are accepted as long as the tip of the thread is within the notch.
Thread gauges are broadly classified into ring gauges and plug gauges. From there, they can be classified in detail as described above.
Ring gauges are used to inspect screws. They are called ring gauges because they are ring-shaped with a female thread in the center of the disk so that the screw to be inspected can be screwed in.
On the other hand, a brag gauge inspects a female thread. They are called plug gauges because they are used by screwing them into the female threads to be inspected.
*Including some distributors, etc.
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Mitutoyo America Corporation was founded in Aurora, Illinois in 1963 by Mitutoyo Corporation of Japan as its American sales, marketing, and service subsidiary. The company provides parts service, manufacturing, and turnkey solutions for metrology equipment for aerospace, alternative energy, automotive, semiconductor, and other industries. The company’s product offerings include coordinate measuring machines, sensor systems, test equipment, and vision measuring equipment customized for customer needs. The company’s services include calibration and repair, installation, contract part programming, and training and education for operation as well as calibration.
WESTport Corporation., founded in West Islip, New York in 1989 is a manufacturer of Precision Fixed Limit Gages used in Aviation and Aerospace industry. The company's product portfolio includes Thread Plug and Thread Ring Gages, Cylindrical Plug and Ring Gages, Custom Design and Build Gages, ACME Gages, and Air Gages. They provide services such as Onsite Services, Gage Repair, and Hardness Testing of products. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation.
Johnson Gage is a Connecticut-based screw thread gage manufacturer established in 1920 by Charles G. Johnson and his three sons. The company’s products are external bench-style gages, portable-style gages, tapered thread gages, etc. Its latest products launched to the market are the ThreadSpec3 software and “centrax” runout and concentricity inspection systems. Now, the company has 90 US patents for its screw thread devices. It also has customers from Fortune 500 companies, start-up manufacturers, aerospace, defense, and mechanical assembly. For services, it provides gage calibration, inspection, engineering, and consulting services.
Thread Check Inc. is an American manufacturer and supplier based in Ronkonkoma, New York, specializing in precision gage solutions. The company product lineup includes thread gages, digital thread depth gages, feeler gauge sets, as well as power-driven thread gages, and spline gauges. Other offerings include plain cylindrical and thread plugs with ring gages, thread and gear measuring wires, three-wire thread measuring systems, thread inspection equipment, and tri-roll thread comparator systems, alongside corresponding software. The company also offers calibration and hardness testing equipment, measuring instruments, precision hand tools, and surveillance masters, along with services like calibration and computer numerical control (CNC) machining.
MTG, Inc., founded in 1967 and located in Carson City, Nevada, is a manufacturer of internal & external gaging. The company's diverse range of products includes gages, fixtures, power screws, and measuring equipments. It's products are utilized in precision engineering and manufacturing processes to ensure accurate measurements, consistent quality, and efficient assembly of components and products. The company's products are used in industries such as aerospace, automotive, defense, and manufacturing.
Gage Crib Worldwide, Inc. was established in 1993 in Grand Rapids, Michigan, USA, as a distributor of rings and plug screw thread gages, measurement tools, and services. The product portfolio of the company includes work plug screw thread gages, ring screw thread gages, and setting plug screw thread gages, among others. These products are essential for precise measurement and quality control of threaded components in various industries, ensuring secure fits and maintaining threaded connections' integrity. The company serves various industries, including automotive manufacturing, aerospace, construction and engineering, oil and gas, industrial machinery, and equipment manufacturing.
Travers Tool Co. Inc. is a supplier of tools for all things metalworking since 1924. The company is headquartered in New York, United States, with distribution centers in South Carolina and California. Travers Tool is the one-stop source for various metal working tools including End Mills, Drills, Safety Equipment, and Tool Wraps. At Travers, they offer tools customized to individual applications, materials, and budgets. The company also offers product selection and expert application support.
Ojiya Seiki Co., Ltd. is a manufacturer of gauges since 1966 and is headquartered in Japan. The company deals in Screw Thread Gauges that have applications in checking threaded parts of fluid equipment, plumbing parts, and pipes along with Measuring Instruments such as Digital Thread Depth Gauge, and Inspection JIGs that are used to cope with the measuring items of geometrical tolerance. There are also Air Micrometers and Gauge Heads for Air Micrometer along with Measuring Heads PMK series for various dimension measuring. These products have vast uses in the automotive, plumbing and related industries.
DAI-ICHI Sokuhan Works Co, founded in 1944 is based in Ojiya, Japan, and is a manufacturer and supplier of machinery tool accessories. Their product portfolio includes measuring instruments, air micrometers, electronic micrometers, gauges, precision machine parts, spindle units, and kneading dispersibility measurement. The products are manufactured under superior technology and precision with quality control. The products are used in multiple industries which include aircraft, trains, automobiles, and other modes of transportation.
OSG Corporation., founded in 1938 and headquartered in Toyokawa, Japan, is a manufacturer of various cutting tools, including end mills, drills, taps, rolling dies, and gauges. The cutting tools are engineered for an array of industries, including energy, automotive, aerospace, die/mold, and heavy. The company also has an academy that it uses as an innovation hub for researching, designing, and developing new products. It established its first overseas subsidiary in the U.S. in 1968, and since then, it has continued to build a network of manufacturing, sales, and technical support locations spanning 33 countries.
Yorkshire Precision Gauges was founded in 1951 and is based in Hatfield, England, as a manufacturer and designer of precision gauges. The company's product list comprises reversible tri-lock plug gauges, taper-lock plug gauges, setting rings, barrel depth gauges, and slot gauges, among others. The precision tools are employed across various industries for quality control and precision measurement, ensuring accurate sizing of engine components, verifying critical component dimensions for safety and reliability, and measuring hole depths in construction work to uphold product quality and adherence to specifications. The company caters to various industries, including automotive, manufacturing, construction, aerospace, and machinery.
WISEMAN Threading Tools Ltd is an ISO 9001-certified manufacturer of threading tools and gauging products established in 1987 in Redditch, Worcestershire, UK. The company specializes in producing various gauges and tools for cutting threading. These include tap wrenches and die stocks, Coventry die heads, and boxed threading sets. The company also offers calibration services for gages, as well as restoration and repair for chasers and die heads. Its products are mainly used by clients in the automotive, medical device production, and petrochemical sectors.
EISEN Co.Ltd., established in 1972 and based in Higashiōmi, Japan, is a manufacturer and supplier of precision tools and equipment. The company's product portfolio includes pin gauges, screw gauges, precision vises, diamond tools, and jigs and tools. These tools are applied in various industries, including electronics, medical devices, metalworking, woodworking, and tool and die making. The company is ISO 9001 certified for quality control and assurance according to international standards for quality management.
Ranking as of July 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Johnson Gage |
14.5%
|
| 2 | Thread Check Inc. |
11.2%
|
| 3 | MTG, Inc. |
10.0%
|
| 4 | WESTport Corporation |
9.7%
|
| 5 | Mitutoyo America Corporation |
7.8%
|
| 6 | Travers Tool Co. Inc. |
6.3%
|
| 7 | Gage Crib Worldwide, Inc. |
5.9%
|
| 8 | OJIYA SEIKI Co.,Ltd. |
5.6%
|
| 9 | Gage Assembly Co. |
4.8%
|
| 10 | WISEMAN Threading Tools Ltd |
4.5%
|
Derivation Method
The ranking is calculated based on the click share within the screw thread gage page as of July 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
9 | 69.2% |
|
Japan
|
3 | 23.1% |
|
United Kingdom
|
1 | 7.7% |
129 products found
129 products
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