All Categories
History
This section provides an overview for threaded connections as well as their applications and principles. Also, please take a look at the list of 18 threaded connection manufacturers and their company rankings. Here are the top-ranked threaded connection companies as of December, 2024: 1.innomatec GmbH, 2.Zhejiang Leadtek Casting Technology Co., Ltd., 3.Marcel Piping Projects Supply PVT LTD.
Table of Contents
1985-2014: Worked for Alstom Corporation, ABB Corporation, and Gadelius Corporation, designing Jungstrom air preheaters and mechanical design of diamond soot blowers. (ABB Corporation: https://new.abb.com/jp)
2014-2021: Worked as an engineering and project manager at Alvos Inc.
https://www.linkedin.com/in/yoichi-hiroki-92192394/
A threaded connection (threaded joint, screw joint, screwed fitting) is a type of pipe fitting.
A pipe fitting is a component used to connect, branch, and close pipes. There are four major types of pipe fittings: threaded connection, welded connection, flanged connection, and ferrule connection.
Threaded connection is one of the four types that can be connected without using special tools or equipment. As a relatively inexpensive piping joint, it is used in a wide range of fields, including power generation and chemical plants, factories, building facilities, and general households.
Figure 1. Example of screwed joint use
Threaded connection is mainly used to connect, branch, and close pipes during piping installation. In most cases, piping routes do not follow a straight line along their entire length, and there are cases in which a pipe route is curved up, down, left, or right, or a single pipe route is branched into two to four pipes, or vice versa, and then assembled. In such cases, threaded connections are required.
Threaded connections are used in many situations in factories, machinery, and homes. However, threaded connections are generally used in piping for low-pressure fluids. For fluids such as high-pressure, high-temperature steam, etc., the possibility of accidents or damage due to leakage exists, so fittings such as plug-in fittings or welded fittings should be used.
As an example, in JIS B2301 threaded malleable iron pipe connection, the maximum working pressure is specified as follows:
| Fluid state | Max. working pressure |
| Static water at 120°C or less | 2.5 MPa |
| Steam, air, gases, and oil up to 300°C | 1.0 MPa |
Threaded connection has a pipe thread machined on one or both ends of the part. The thread shape is specified by various standards, and the typical types are as follows.
| Standard | Standard No. | Standard Name |
| ISO | 228-1 | Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation |
| 7.1 | Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation | |
| ANSI / ASME | B1.20.1 | Pipe threads or general -purpose inch |
| NPS: American National Standard Straight Pipe Threads | ||
| NPT: American National Standard Taper Pipe Threads |
Tapered pipe threads have a thread outside diameter that decreases toward the tip for male threads and toward the depth of the hole for female threads. For parallel pipe threads, the thread outside diameter is the same over the entire length of the thread for both male and female threads.
Threaded connection prevents leakage of fluid by ensuring that the male and female threads are tightly fitted together. Generally, when used as a fitting for piping, tapered pipe threads are used in many cases because they are more tightly sealed than parallel pipe threads. Sealing tape can be wrapped around the threads or sealing material can be applied to further improve sealing. See figure 2 below for a close fit of the male and female threads.
Figure 2. Principles of taper screw
The two types of parallel pipe threads and tapered pipe threads are selected in the following combinations according to the application and required tightness.
| Combination of threads | Male thread | ||
| Tapered pipe thread (R) | Parallel pipe thread (G) | ||
| Female thread | Tapered pipe thread (Rc) | ◎ | ×2 |
| Parallel pipe thread (Rp) | ◎ | ×2 | |
| Parallel Thread for Pipe (G) |
×1 |
〇1 | |
Symbol Description
◎: Can be combined with sealing tape for tight joints such as piping.
〇1: Mechanical joints can be combined by using packing or gasket together.
×x1: Combination is not possible due to the possibility of leakage caused by damage to the parallel threads or packing.
×x2: Depending on the screw manufacturing tolerance, it may not be possible to screw in, so sealing cannot be achieved, and the combination is not possible.
There are several types of threaded connections depending on the application and direction.
Standard threaded connections are specified in terms of dimensions, shape, material, and range of application in each standard. Refer to the table below for the various standards of threaded connections.
| Standard | Standard No. | Standard Name |
| JIS | B2301 | Threaded malleable cast iron pipe fittings |
| B2302 | Threaded connections for steel pipes | |
| B2303 | Threaded drainpipe joints | |
| B2308 | Stainless steel threaded connections | |
| ISO | 4144 | Pipework - stainless steel fittings threaded in Accordance with ISO 7-1 |
Types of JIS B2301
There are many types of threaded connections, and examples of JIS B2301 are shown in the table below. Refer to figures 2 and 3 for their shapes.
| Type | Uses | |
| Elbow | 90° elbow | For changing the piping route to 90° or 45° |
| 45° elbow | ||
| Different diameter elbow | ||
| Male and female elbows (street elbows) | ||
| 45° Male and female elbows (45° street elbows) | ||
| Male elbow with different diameter (different diameter street elbow) | ||
| Tee (cheese) | Tee with the same diameter | Branching (or gathering) piping routes in three directions |
| Different-diameter tee | ||
| Three-way different-diameter tee | ||
| Cross | Same diameter cross | When branching (or assembling) piping routes in 4 directions |
| Different diameter cross | ||
| Sockets | Sockets with the same diameter | When joining pipes with male threads |
| Different diameter sockets | ||
| Female male socket | ||
| Bushing | When joining female threaded connections and pipes of different diameters | |
| Nipple | Same diameter nipple | For joining threaded connections with female threads |
| Different diameter nipple | ||
| Cap | To close a pipe with male threads | |
| Plug | To close a female threaded connection | |
| Union | Same diameter union | When female threaded connections are joined and need to be separated |
| Female male union | ||
| Union Elbow | ||
| Male Male union elbow | ||
Figure 3. Types of screwed joints (1)
Figure 4. Types of screwed joints (2)
Various sizes are available for each type, and are selected according to the pipe nominal diameter.
Product specifications and sizes of threaded connections are defined by JIS standards and are indicated as follows.
| Standard No. or Standard Name | Type | Shape | Surface condition | Joint nominal | |
| Example 1 | JIS B 2301 | Type I | Male and female elbows, different diameter | black | 2 x 3/4 |
| Example 2 | Threaded malleable iron pipe fitting | Type I | 45° elbow | plated | 1-1/2 |
*Including some distributors, etc.
Sort by Features
Sort by Area
Lincoln Manufacturing Inc., established in 1997 with headquarters in Magnolia, Texas, USA, is a manufacturer of oil country tubular goods. The company's product line includes casing strings, market joints, couplings, float collars, and float shoes. These products are primarily used in the fracking industry, although they are also used in other applications across the oil and gas mining industries. The company's services include swedge and up-setting pipe, threading repair, warehousing, welding, and full-length threading. It also offers turn-key solutions for well construction, completion, and workover.
Langfang Pannext Pipe Fitting Co. Ltd., established in 1993 and headquartered in Langfang City, Hebei, China, is a manufacturer of pipe fittings. The company's main products include malleable iron pipe fittings, bronze pipe fittings, and color plastic spraying-coated malleable iron pipe fittings. Each of its product lines is available in various Class American Standard sizes. It also offers the production of customized malleable iron pipe fittings. The company has a sales office in Houston, Texas, United States, and a second manufacturing facility in Thailand.
IHARA SCIENCE CORPORATION, established in 1941 and headquartered in Takanawa, Minato ward, Tokyo, is a manufacturer specializing in bite-type tube fittings and other high-pressure fittings designed for hydraulic applications. The company offers a wide range of product portfolios including fittings, pipes, valves, and related components. These quality products serve critical roles in various industries, including railway vehicles, semiconductor manufacturing, measurement instruments, construction machinery, and more. The aim of the company is to provide optimal piping systems tailored to meet the specific needs and demands of diverse applications.
AB Steel, established in 2001, is a manufacturer and supplier of stainless steel seamless and welded pipes and tubes based in Mumbai, India. The company’s product range includes stainless steel pipes, tubes, fittings, flanges, and more. They also deal in Monel, Inconel, Hastelloy metals, and copper tubes serving industries such as engineering, chemicals, pharmaceuticals, and more. With ISO 9001:2008 certification and global suppliers in countries like South Korea, China, Mexico, and the USA, AB Steel caters to diverse client requirements and needs globally.
Nan Ya Hardware Sdn. Bhd, founded in 2001 and based in Selangor, Malaysia, is a manufacturer of residential and industrial use pipes, fittings, valves, and plumbing accessories. The company's product range includes mild steel, stainless steel, and PVC flanges, strainers, water meters, and water tanks/heaters. These products are used in various sectors, including construction, engineering, manufacture, oil and gas, and retail stores. The company holds various certifications, including ISO 9001 and ISO 14001.
Zhejiang Leadtek Casting Technology Co., Ltd., founded in China in 2015, is a manufacturer of stainless steel ball valves, gate valves, and globe valves. The company's product range includes check valves, filters, camlock, pipe fittings, and other equipment accessories, which are widely used in petroleum, chemical, fire protection, medicine, food, semiconductor, and other fields. Its products are exported to South Korea, the United States, Brazil, Russia, and the United Kingdom.
UNIQUE CORPORATION, founded in Mumbai, India, is a manufacturer of pipe and pipe fittings. The company's product range includes a wide variety of pipes in different materials, sizes, and configurations, suitable for diverse applications such as water supply, plumbing, oil and gas, industrial processes, and more. It also manufactures pipe fittings, including elbows, tees, reducers, flanges, and connectors, designed to facilitate the connection, direction, and control of fluids within pipelines.
Dynamic Forge & Fittings P. Limited, established in 2009, is a company based in Valsad, India, that is a manufacturer of Pipe Fittings that adhere to National and International Standards. Dynamic Forge formulates specific strategies to attain consistent national and international Optimum Quality Standards, aligning with the quality standards set by customers to fulfill their expectations. The organization demonstrates a solid devotion to consistently advancing Quality Management practices to assure their appropriateness.
innomatec GmbH, established in 1983 and headquartered in Hessen, Germany, is a manufacturer of leak testing solutions and related equipment. The company specializes in leak test methods, including air, helium, and tracer gas tests. Its products include leak testers, test benches, and quick connectors, offering over 100 test object connections. It also provides standard helium gas recycling solutions for manufacturing lines. The company’s solutions span from laboratory setups to fully automated systems, meeting the testing requirements of industries such as automotive, medical devices, and packaging. It provides repair, maintenance, and calibration services, ensuring compliance with industry standards.
Aerre Inox S.r.l., founded in 1990 and based in Lombardia, Italy, is a manufacturer of stainless-steel valves and devices. The company offers a range of aseptic and process valves, magnetic stirrers, and custom-made heat exchangers. It also produces fittings and sampling devices for various industrial sectors, such as pharmaceutical, biotechnological, and cosmetic. The company's products utilize CAD-CAM technology and numerical control machines, and they comply with FDA, USP Class VI, and ATEX certifications, ensuring conformity to strict industry standards.
Bosch Rexroth’s origins date back to 1795 and is now based in Lohr am Main, Germany. Bosh Rexroth is a manufacturer of industrial and mobile equipment control and motion products and systems. Bosch Rexroth’s products are divided into 10 technology segments. First is assembly technology which includes modular components. Next are electronic drives and controls which include CNC and motion control. Industrial hydraulics and linear motion technology follow. Mobile hydraulics, electronics, and IoT include solutions for mobile machines. Gear technology includes planetary gearboxes. The final four segments are molding and casting technology, tightening technology, resistance welding, and mobile robotics.
The Metals Factory, founded in India is a manufacturer of steel pipes, pipe fitting, and pipes. The company product portfolio consists of a wide range of steel pipes, including seamless, and welded that are available in various sizes, grades, and specifications to meet diverse industry needs and a range of pipe fittings, including elbows, tees, reducers, and flanges. The company exports its products to countries in Africa, America, Europe, Middle East and Australia.
Ozairtradelink was founded in 2010 and is based in Gujarat, India, and is a manufacturer and supplier of different metal products and alloys for various industrial applications. The company's product folio consists of high nickel alloys, aerospace alloys, titanium alloys, and Hastelloys in the form of round bars, forged bars, tubes, sheets, and coils that have wide applications in aeronautical, architecture, mining, automotive, and, electronics devices industries. The company has ISO 9001: 2015 quality management system certification and also offers waterjet cutting, hydraulic press cutting, fabrication, forging, and casting, services.
Marcel Piping Projects Supply Pvt Ltd is a manufacturer, distributor and supplier of steel and piping products based in Mumbai, India. The company product catalog, includes flanges, butt weld fittings and forged fittings used in the oil and gas, dams, petrochemical and shipbuilding industries. Its products come with additional services like electro polish, hot dip galvanizing and Epoxy & FBE coating. Also, the products are marked with Grade Lot number, size,degree and the company's trademark. In addition, the company is CE and ISO-certified and supplies piping products to more than 50 countries.
Savoy Piping Inc., founded in 1987 and based in India, is a supplier of total piping solutions to a diverse range of industries. The firm is a full-service provider of seamless steel pipes and tubes in stainless steel, carbon steel, and alloy steel. The company offers a complete variety of mechanical and pressure products that adhere to ASTM, ASME, DIN, JIS, ISO, and API standards. All of the products are offered with complete Traceability records in the form of Mill Certificates or Test Certificates from tests conducted at reputable and Government-approved Laboratories.
Arita Engineering Sdn. Bhd., founded in Malaysia in 1994, is a distributor of valves and piping equipment and spares. The company's product portfolio includes a diverse selection of valves, including ball valves, gate valves, globe valves, check valves, specialty valves, pipe fittings, flanges, couplings, and more, to support fluid and gas transport needs. Its products are used in the transport of petroleum products, natural gas, and chemicals and water distribution and wastewater treatment systems.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | innomatec GmbH |
20.0%
|
| 2 | Zhejiang Leadtek Casting Technology Co., Ltd. |
20.0%
|
| 3 | Marcel Piping Projects Supply PVT LTD |
20.0%
|
| 4 | Lincoln Manufacturing Inc |
20.0%
|
| 5 | AB steel |
20.0%
|
Derivation Method
The ranking is calculated based on the click share within the threaded connection page as of December 2024. 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 (%) |
|---|---|---|
|
India
|
6 | 50.0% |
|
China
|
2 | 16.7% |
|
Malaysia
|
2 | 16.7% |
|
United States of America
|
1 | 8.3% |
|
Japan
|
1 | 8.3% |
353 products found
353 products
Nagoya Co., Ltd.
80+ people viewing
Last viewed: 58 minutes ago
Nagoya Co., Ltd.
40+ people viewing
Last viewed: 7 minutes ago
Yamato Engineering Co., Ltd.
30+ people viewing
Last viewed: 11 hours ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
Yamato Engineering Co., Ltd.
30+ people viewing
Last viewed: 11 hours ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
Yoshiro Kiko Co., Ltd.
30+ people viewing
Last viewed: 54 minutes ago
■High precision stainless steel parts We ensure the highest quality of stainless steel parts, from raw materials to finished products, and provide ...
Yamato Engineering Co., Ltd.
20+ people viewing
Last viewed: 10 hours ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
Toyo Assembly Co., Ltd.
60+ people viewing
Last viewed: 3 hours ago
Yamato Engineering Co., Ltd.
30+ people viewing
Last viewed: 9 hours ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
CK Metal Co., Ltd.
190+ people viewing
Last viewed: 18 hours ago
This is a screw connection joint used for small and medium diameter steel pipes. Tapered pipe threads (JIS B 0203) are machined into the threaded p...
10 models listed
Toyo Assembly Co., Ltd.
50+ people viewing
Last viewed: 9 hours ago
Yamato Engineering Co., Ltd.
30+ people viewing
Last viewed: 9 hours ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
CK Metal Co., Ltd.
140+ people viewing
Last viewed: 5 hours ago
The surface coating of the white joints is hot-dip galvanized. e-white joints use the highest purity electrolytic zinc and have the same "e-plating...
10 models listed
Yagyu Shokai Co., Ltd.
10+ people viewing
Last viewed: 1 day ago
Very Fast Response
■Features Connections can be easily made by simply inserting the tube and tightening the nut.
Yamato Engineering Co., Ltd.
20+ people viewing
Last viewed: 1 day ago
We have a lineup of "materials, sizes, and shapes" depending on the application, from air piping in factories to air tools, etc. ■Summary ・Excell...
Everloy Trading Co., Ltd.
20+ people viewing
Last viewed: 22 hours ago
Very Fast Response
■Features Loosen the cap to move the ball, and tighten the cap to fix the ball in any position. ■Material ・Stainless steel (standard SUS303) ·bra...
Everloy Trading Co., Ltd.
10+ people viewing
Last viewed: 2 hours ago
Very Fast Response
■Features - Loosen the cap to move the ball, and tighten the cap to fix the ball in any position. - Compact shape saves space. ■Material ・Body: S...
Bee & Plus Co., Ltd.
510+ people viewing
Last viewed: 5 hours ago
Standard Response
Features ■ Both couplings and nipples have a valve. Prevents fluid leaks during separation. ■ Compact by its own valve structure Designed in space...
6 models listed
Miyata Industries Co., Ltd.
70+ people viewing
Last viewed: 5 hours ago
Standard Response
A threaded socket is a socket with a flange and nut for connecting PVC pipes. Since it is designed to be fixed to an FRP tank, it can be used as an...
Miyata Industries Co., Ltd.
110+ people viewing
Last viewed: 5 hours ago
Standard Response
A threaded socket is a socket with a flange and nut for connecting PVC pipes. Since it is designed to be fixed to an FRP tank, it can be used as an...
Miyata Industries Co., Ltd.
60+ people viewing
Last viewed: 1 day ago
Standard Response
A threaded socket is a socket with a flange and nut for connecting PVC pipes. Since it is designed to be fixed to an FRP tank, it can be used as an...
YTK
20+ people viewing
Last viewed: 1 day ago
Standard Response
■THREAD ADAPTORS-Thread Adaptors ・Straight adapter ・Circle nipple ・Hex nipple ・Hex coupling ・Pipe cap ・Pipe plug
Tsukiji Manufacturing Co., Ltd.
170+ people viewing
Last viewed: 1 hour ago
Standard Response
4.0 Company Review
633DF150125AL is made to order.
9 models listed
Tsukiji Manufacturing Co., Ltd.
70+ people viewing
Last viewed: 11 hours ago
Standard Response
4.0 Company Review
Tsukiji Manufacturing Co., Ltd.
80+ people viewing
Last viewed: 1 day ago
Standard Response
4.0 Company Review
This will be a made-to-order item.
