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This section provides an overview for unified thread standards as well as their applications and principles. Also, please take a look at the list of 17 unified thread standard manufacturers and their company rankings. Here are the top-ranked unified thread standard companies as of April, 2025: 1.Thread Check Inc., 2.Hubs, 3.Judge Tool & Gage.
Table of Contents
A unified thread standard is an inch-based threading system with standardized basic dimensions in inches and a 60° thread angle.
While metric screws are standardized in metric units, the unified thread standard, including the witt screw, represents inch-based screws. For more information, visit inch screws on Metoree.
Unified thread standards are commonly used in aircraft, automobiles, and motorcycles. They are also prevalent in measuring instruments and industrial robots manufactured internationally, particularly in the United Kingdom, the United States, and Canada.
These standards are occasionally used in domestic equipment, primarily when the components are manufactured abroad.
The principle of the unified thread standard is similar to that of standard screws. Utilizing the screw's slope, a heavy object can be lifted with minimal tightening torque, creating a significant fastening or axial force.
The screw remains secure due to the frictional force on the slope, which exceeds the gravitational slope component, thereby maintaining the fastening force. The thread angle of both unified and metric screws is 60°. However, the witt screw has a 55° thread angle.
Similar to metric screws, unified thread standards come in two types: coarse (UNC) and fine (UNF). The primary difference lies in the thread pitch, with fine threads having more threads per inch than coarse threads. The denser arrangement of fine threads makes them less prone to loosening but requires more turning for tightening, making them less suited for mass production.
Unified thread standards are denoted by labels such as UNC and UNF, as well as by fractions. Below is a guide to understanding these notations with an example.
Example: 3/8 - 20UNC x 5/8
1. 3/8: Thread Nominal (thickness)
This refers to the screw's thickness, including the threads. In inch threads, this measurement is typically expressed as a fraction with 8 as the denominator.
2. 20: Number of Threads Per Inch
This represents the number of thread peaks within a one-inch length. For screws shorter than 1, the thread count is extrapolated to a one-inch length.
3. UNC: Thread Type (Coarse or Fine)
This indicates whether the thread is coarse (UNC) or fine (UNF).
4. 5/8: Length Below the Screw Head
Expressed in fractions of an inch, this length is measured from the base of the screw head to the end of the screw. It includes the length of the unthreaded shank. In tapered head screws, this length corresponds to the total length of the screw.
While the notation generally follows this format, there are unique terms for thread sizes. The thread designation, indicating the screw's outer diameter, starts with the thinnest (e.g., #0, #1) and goes up to #12.
For sizes larger than #12, the diameter is represented by fractions of an inch, divided into eighths or quarters. These fractions are colloquially referred to as follows:
*Including some distributors, etc.
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NBK America LLC, founded in 2015 and based in King of Prussia, Pennsylvania, is an American manufacturer and a subsidiary of Japan's Nabeya Bi-tech Kaisha, specializing in mechanical components. Their product range includes couplings, like miniature shaft couplings for precision machine tools and semiconductor manufacturing equipment, special screws, such as vacuum application screws and other machine components. NBK offers finite automaton (FA) solutions, including wireless positioning units for production lines and setup operations. NBK provides machine component servicing, such as vibration resistance treatment and laser engraving. Services for couplings and special screws include coupling stainless steel screw alteration and screw length adjustment.
Allied Titanium, a manufacturer of titanium parts, was founded in 2007 in Sequim, Washington. The company manufactures fasteners and products for various industries, including marine, hiking, camping, household and tools, industrial, jewelry, hardware, auto parts, bicycle parts, mill products, and medical products, all made from titanium. Additionally, the company produces titanium welding wires. The company holds ISO9001 and ISO9100D certification and it's products are distributed through online modes. It also sells its products for wholesale.
Rolled Threads Unlimited, LLC, founded in 1985 and headquartered in Waukesha, Wisconsin, is a manufacturer specializing in precision thread rolling and knurling services. The company produces fully threaded bar, custom machined parts, fully threaded and double-ended studs, bolts, lead screws, and specialty fasteners. These products are used in diverse industries, including aerospace, agriculture, automotive, and construction. The company is capable of thread rolling carbon and alloy steel, brass, copper, aluminum, and stainless steel.
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.
Judge Tool & Gage Inc. is a distributor of precision measurement, calibration, and inspection solutions, located in Stratford, Connecticut. Its extensive inventory of precision measurement equipment, industrial gauges, optical instruments, and related items, featuring products from industry leaders like Mitutoyo, Starrett, Meyer Gage, and Deltronic. Professionals from various industries can explore a diverse range of measurement tools, including air gauging, borescopes, micrometers, calipers, indicators, as well as force and torque measurement devices, and optical comparators.
CAPLUGS is a manufacturer and distributor of protective solutions. The company is founded in 2005 and is based in New York, United States. The company product lineup includes plastic caps, plugs, netting, tubing, and masking devices, designed to prevent damage, contamination, and moisture ingress. The company caters to diverse industries including automotive, aerospace, electronics, medical, and more. The company offers an extensive range of protective solutions to safeguard critical components during manufacturing, shipping, and storage.
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.
TorqBolt Inc., founded in 2013 with headquarters in India, is a manufacturer of exotic alloy fasteners. The company's product line includes nuts, screws, washers, and stud bolts, as well as the supply of surface treatments for various applications for original equipment manufacturers, refineries, and end users. TorqBolt Inc.'s material inventory includes nickel alloys, super duplex steels, weathering steels, stainless steels, and carbon steels. The company also offers custom production of non-standard fasteners for engineering applications and infrastructure projects.
Hubs, formerly known as 3D Hubs, B.V., founded in 2013 and a subsidiary of Proto Labs, Inc., is a manufacturer headquartered in Amsterdam, Netherlands that specializes in developing online manufacturing platform. The company offers a platform that connects engineers with manufacturing partners, offering a range of capabilities, including 3D printing, computer numerical control (CNC) machining, injection molding for prototypes and production tooling, and sheet metal fabrication. Notably, the company has evolved from a peer-to-peer 3D printing network to include full-service manufacturing, with clients like National Aeronautics and Space Administration (NASA) and Space Exploration Technologies Corp. (SpaceX)
Intafast Limited, founded in Eastbourne, East Sussex, in 1988 is a distributor of Industrial fastenings, brass threaded inserts, and precision turned parts. The company's product portfolio includes machine & wood screws, Kits, Rivets, Thread forming & Self Tapping and Socket screws. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. They also offer services such as Plating, Patching, Kitting, Stock Management and Custom Manufacturing.
TR Fastenings Ltd. is part of Trifast plc, established in 1973, is a global distributor of industrial fasteners and components, based in the United Kingdom. The company caters to automotive, electronics, and general manufacturing sectors. They supply components to over 5,000 companies globally across a wide range of industries, blending their global manufacturing capability, with strong distribution and logistic support, creates a winning combination. Their Group consists of 34 locations within the UK, Asia, Europe and the USA including 7 high volume sites manufacturing cold forged fasteners and special parts and 3 technical and innovation centres.
Tameson was founded in 2013, in Eindhoven, the Netherlands as an online-based supplier and distributor of industrial products. The company offers a wide range of products, including valves, tubes and hoses, fittings, electrical accessories, and hydraulics. There are also Office supplies such as memory cards, cables, etc. along with measuring and controlling devices like thermometers, gauges, levels, and more. Industries such as Home and Garden, Food and Beverage, Automotive, HVAC, and Industrial Automation, amongst others, benefit from the products distributed by Tameson.
Ranking as of April 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Thread Check Inc. |
40.0%
|
| 2 | Hubs |
20.0%
|
| 3 | Judge Tool & Gage |
20.0%
|
| 4 | CAPLUGS |
20.0%
|
Derivation Method
The ranking is calculated based on the click share within the unified thread standard page as of April 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
|
7 | 53.8% |
|
United Kingdom
|
3 | 23.1% |
|
India
|
1 | 7.7% |
|
China
|
1 | 7.7% |
|
Netherlands
|
1 | 7.7% |
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