9 NPT Thread Manufacturers in 2024
This section provides an overview for npt threads as well as their applications and principles. Also, please take a look at the list of 9 npt thread manufacturers and their company rankings. Here are the top-ranked npt thread companies as of April, 2024: 1.StainlessSteelFittings.com, 2.Teesing, 3.Tameson.
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/
What Is an NPT Thread?
An NPT thread is a type of American National Standard Taper Pipe Thread, which is used for pipe end threads and pipe fittings.
The following types of NPT threads are used for pipe joints:
Uses of NPT Threads
NPT threads, like other tapered pipe threads, are primarily used in joints where tightness is required. They are particularly useful for joints in machinery, equipment, and plant piping that are designed and manufactured by the manufacturer according to American and ANSI/ASME standards.
Typical examples of use are pipe fittings used for threaded pipe joints. Note that there are various types of threaded pipe fittings with NPT threads.
Figure 1. Threaded pipe fittings with NPT (National Pipe Taper) screws
NPT threads are also used in many piping assemblies, such as NPT female threads on valve joints and NPT male threads on pipe (tube) ends.
Figure 2. NPT screw piping assembly use cases
Principle of the NPT Thread
Figure 3. Tightening depth dimensions of NPT screw
The taper of an NPT thread is such that the line connecting the tops of adjacent threads (or the bottom of a thread trough) and the thread center axis are angled rather than parallel. This angle causes the male thread to taper toward the tip and the female thread to narrow from the end face of the hole to the back.
The deeper the NPT thread is tightened, the smaller the gap between the male and female threads becomes, and the stronger the tightening. However, care should be taken not to over-tighten the screw as this may result in damage to the screw.
The ANSI standard specifies the L1 dimension for each screw size as the tightening depth when hand-tightening. However, this dimension is only a guide and varies depending on the processing accuracy of the screw.
Torque control and tightening depth control are performed at each site.
Other Information on NPT
1. Standard Mountain Shape of NPT Thread
Figure 4. Reference mounting style for NPT and R screws
The reference profile of the NPT thread has a 1/16th taper to the center of the thread axis with an angle of 3.576° (1/32, 1.789° on one side) and a thread crest or trough angle of 60°. The reference profile of the NPT thread and R thread have the same 1/16th taper angle but a different crest or trough angle of 55°. Therefore, NPT threads and R threads are not interchangeable.
Taper ratio = 1/16 is a slope of 1 inch in the diameter direction for a thread center axial length of 16 inches.
2. Taper and Parallel Threads
Figure 5. Combination of NPT and NPS screws
Generally, when tightening an NPT thread, wrap sealing tape or similar material around the male thread side to improve sealing. However, in addition to the NPT thread, the ANSI standard includes the NPTF thread (Dryseal USA Standard Taper Pipe Thread) as a taper thread for pipes, which can ensure tightness without the use of sealing material.
In contrast to the taper thread, there is the NPS thread (National Pipe Straight Pipe Thread), which is a parallel thread for pipes and is specified under the same ANSI standard number as the NPT thread.
3. Standards for NPT Threads
NPT threads are specified by the following standards:
ANSI/ASME B1.20.1 Pipe Threads, General Purpose (Inch)
ANSI (American National Standards Institute) is a representative standardization organization of the United States. ASME is the American Society of Mechanical Engineers.
A similar thread to the NPT thread is the R thread in the ISO standards, and is specified in the following:
JIS B0203, Taper Pipe Threads
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads-Part 1: Dimensions, tolerances, and designation.
4. Taper Pipe Threads Other Than NPT
The taper threads used in Japan are almost always JIS R threads, although ANSI/ASME NPT threads are also used in some cases. However, NPT threads and JIS R threads are not interchangeable and cannot be used in combination in the same joint.
Therefore, care must be taken not to mistake NPT threads for other tapered screws during maintenance and servicing work. (Note that NPT threads can be identified by using an NPT thread gauge.
List of 9 NPT Thread Manufacturers
*Including some distributors, etc.
Sort by Features
- Default
- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
Sort by Area
- United States of America
- Netherlands
- Switzerland
- United Kingdom
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StainlessSteelFittings.com
NPT Pipe Threads
Distributor Overview
StainlessSteelFittings.com, founded in 2000 and headquartered in Colorado, United States, is a reputable distributor of stainless fittings, adapters, stainless components, and various other stainless steel products. The company distributes various types of tubes, pipes, threaded adapters, hose ends, and hoses. These stainless products are available in both 304 and 316 steel materials, resistant to corrosion, and have minimal reactivity to almot all chemicals. The products are used in machinery, oil and gas, energy production, chemical manufacturing, marine, etc. It also provides on-site design and installation support by scheduling location visits. Moreover, comprehensive material traceability reports are available for every stainless fitting.
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Teesing
NPT gas thread
Manufacturer Overview
Teesing, established in 1952, is a global manufacturer and supplier headquartered in Rijswijk, Netherlands specializing in the supply of fittings, valves, tubing, systems, and assemblies for industrial applications. The company’s product portfolio includes fittings, valves, tubing, systems and assemblies for industrial applications. They also provide solutions in pneumatics, hydraulics, instrumentation, and media transport catering to various industries including medical, water treatment, automotive, and more. The company offers engineering field support and can develop customized products and assemblies to meet the customer’s specifications. The company offers solutions worldwide with offices in the Netherlands, USA, China, and Taiwan.
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Century Drill & Tool, LLC
TAP NATIONAL PIPE THREAD 1-11 1/2 NPT
Company Overview
Century Drill & Tool, LLC is a manufacturer and supplier of power tool accessories, hand tools, abrasives, and threading products is based in Green Bay, Wisconsin, USA and was established in 1940. The products are designed to perform under the greatest challenging industrial applications and are used by contractors, professionals, automotive shops, and do-it-yourselfers. It offers the largest selection of power tool accessories in the market and has a heritage of product quality. The company supports independent retailers and online platforms.
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Cutwel
NPT Thread Gauges
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Vischer & Bolli AG Machining and workholding
(NPT) National-Pipe-Thread
Distributor Overview
Vischer & Bolli AG Machining and workholding, founded in Germany in 1957, is a supplier of drilling, deburring, and milling machines. The company's product portfolio includes flat drills, step drills, 3-lip drills, deep hole drills, and micro drills for every application of materials such as steel, cast iron, aluminum, stainless materials, stainless steel, and titanium. It also offers clamping products such as MasterGrips, Workpiece stops, Deflection clamping jaw, and Wedge clamping elements.
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Tameson
National Pipe Thread
Distributor Overview
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.
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AutomationDirect Inc.
National Pipe Thread (NPT)
Distributor Overview
AutomationDirect.com was founded in 1994 to provide solutions for the industrial automation market and has been growing its list of offerings ever since. AutomationDirects’ extensive catalog includes individual components such as cables, various controls, I/O devices, relays, gauges, fittings, and sensors to complete systems. Many parts and devices, especially PLC units are customizable. AutomationDirect.com also provides support via video instructions, online manuals, a learning library, an active community forum to further assist customers.
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NPT Thread Manufacturer Ranking
*Including some distributors, etc.Ranking as of April 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | StainlessSteelFittings.com |
30.0%
|
| 2 | Teesing |
20.0%
|
| 3 | Tameson |
20.0%
|
| 4 | Stewart-Buchanan Gauges Ltd |
10.0%
|
| 5 | Harold G. Schaevitz Industries LLC |
10.0%
|
| 6 | Vischer & Bolli AG Machining and workholding |
10.0%
|
Derivation Method
The ranking is calculated based on the click share within the npt thread page as of April 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
- Tameson: 2013 (11 years ago)
- Vischer & Bolli AG Machining and workholding: 1957 (67 years ago)
- Teesing: 1952 (72 years ago)
Company with a History
- Teesing: 1952 (72 years ago)
- Vischer & Bolli AG Machining and workholding: 1957 (67 years ago)
- Tameson: 2013 (11 years ago)
NPT Thread Manufacturers in United States
*Including some distributors, etc.
Global Distribution of NPT Thread Manufacturers by Country
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
2 | 33.3% |
Netherlands
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2 | 33.3% |
United Kingdom
|
1 | 16.7% |
Switzerland
|
1 | 16.7% |
