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This section provides an overview for hydraulic nuts as well as their applications and principles. Also, please take a look at the list of 17 hydraulic nut manufacturers and their company rankings. Here are the top-ranked hydraulic nut companies as of December, 2024: 1.Hangzhou Fuyang Tengming Industrial Co., Ltd, 2.ITH Bolting Technology, 3.YINSH PRECISION INDUSTRIAL CO., LTD..
Table of Contents
A hydraulic nut is a nut that is fastened by an axial force generated by hydraulic pressure, not by a screw.
The fastening force between a bolt and nut with a screw is generated by pulling up the axis of the screw using the screw's helix. Hydraulic nut, on the other hand, uses hydraulic pressure to pull the bolt to generate the fastening force. As is the case with bolts that use screws, the nut can be subjected to torsion due to the frictional force of the screw, and variations in axial force can be suppressed.
No tightening tool is required because the bolt is pulled and fastened by a component that has a hydraulic function in the nut itself. The hydraulic nut is set on the bolt and a hose connected to a hydraulic pump is connected to the hydraulic nut supply port. By attaching the hose, multiple nuts can be tightened simultaneously. When hydraulic pressure is applied, oil is fed into the hydraulic nut, and the bolt is pulled to tighten.
A hydraulic nut uses a nonflammable glycol fluid instead of oil to provide the hydraulic function. The difference between a hydraulic nut and a bolt tensioner is that a hydraulic nut acts as a nut, whereas a bolt tensioner is set on the bolt and nut and removed after tightening, so it does not remain in place like a hydraulic nut.
Hydraulic nuts are used in fastening relatively large-size bolts. The screws used are in the range of M20~300.
They are also used for mold fixing bolts for molding presses and injection molding machines and for the temporary fastening of large bolts on the mating surfaces of gas turbine and steam turbine casings for thermal power generation.
A hydraulic nut uses hydraulic pressure to pull the bolt and generate an axial force on the bolt. Hydraulic pressure is based on Pascal's principle, which states that when a certain force is applied to a sealed container of liquid, the pressure acts perpendicular to the surface of the container equally in all directions without reducing the volume.
The hydraulic nut allows the bolt to continue to generate the axial force on the bolt even after the hydraulic pressure is removed by allowing the nut to sit on the object to be fastened while the bolt is being pulled by the hydraulic pressure. When axial force is generated by an ordinary screw, the bolt will break at a lower axial force than simple tension because the friction of the threaded surface and the seating surface of the bolt's head will cause the bolt to twist.
In addition, the frictional force of the screw and seat surface is variable, and when combined with the variation in tightening torque, there is typically a very large variation in axial force. With hydraulic nuts, the bolt is not subjected to torsion and the exact axial force can be determined from the hydraulic pressure.
Hydraulic nuts can be used in tight places where a hydraulic torque wrench or bolt tensioner would have difficulty. Hydraulic nut is also suitable for tightening many bolts at the same time and evenly in other tight places where tools cannot enter. Tightening work is possible even in places with complicated shapes or where it is difficult for tools to enter if a hydraulic hose can be attached. Hydraulic nut is also suitable for tightening where the base shifts when the nut is tightened since there is no twisting power.
Compared to a hydraulic torque wrench, which controls torque, the hydraulic nut can be tightened more precisely without being affected by friction. By attaching a hose, multiple nuts can be tightened at the same time, thus eliminating variations in bolt tightening. Another advantage is that it prevents one-sided tightening of flanges and eliminates the need for diagonal tightening, thereby increasing work efficiency.
Hydraulic nuts are also useful when frequent and precise fastening and unfastening of multiple bolts and nuts is required, when loosening due to vibration is a concern, and in high-temperature locations. They are used in nuclear power plants because they are efficient and can be used at high temperatures, thus contributing to reduced worker exposure.
Unlike hydraulic torque wrenches used for manual tightening and torque management, this wrench does not twist the bolt and applies axial force directly, so there is no friction when tightening and highly accurate axial force management is possible. Also, since the bolt is not twisted, frictional heat is not generated, and there is no burning of the flange or threaded parts.
*Including some distributors, etc.
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Riverhawk Company, established in 1993 in New Hartford, New York, is a manufacturer of hydraulic bolting and tensioning products. The company offers hydraulic bolting tensioners, clamp rings, peak savers, shaft clamps, and lapping tools for the petrochemical and power generation markets. The company also provides hydraulic fittings, pump kits, gas turbine systems, and various hydraulic accessories for the manufacturing, construction, mining, nuclear, and wind power industries. The company also organises in-house and off-site training sessions on the installation, operation, and maintenance of its products.
Schaeffler Group USA Inc. (SGUS) is an American manufacturer and supplier of automotive products and solutions established in 1946 as the North American subsidiary of the Shaeffler Group, which operates globally. Based in Fort Mill, South Carolina, the company manufactures standard engine, transmission and chassis products such as torsion dampers, valve train systems, and camshaft phasing units. They also produce aftermarket repair solutions like clutch and release systems, as well as various industrial bearings and linear motion systems. SGUS primarily supplies the automotive sector, as well as the industrial operations of various industries including rail, green energy, and aerospace.
The Timken Company (Timken) was founded in 1899 and is headquartered in North Canton, Ohio. Timken designs, manufactures, and manages engineered bearings and industrial motion products worldwide. Timken operates in two segments, Mobile Industries and Process Industries. The Mobile Industries segment’s portfolio includes bearings, seals, and lubrication devices and systems. The Process Industries segment provides industrial bearings and assemblies; industrial motion components, such as gears and gearboxes; and linear motion products, couplings, seals, lubricants, chains, belts, and related products and services to OEMs and end users in various industries.
TRITORC, Inc. established in 1994 and based in Pasadena, Texas, is a manufacturer and supplier of hydraulic, pneumatic, electric, and manual torque wrenches. The company's product range includes hydraulic torque wrenches, bolt tensioners, heavy-duty impact sockets, manual torque multipliers, and pipe-cutting tools. These tools are pivotal for robust bolting, machine adjustments, and intricate cutting tasks. Serving industries such as machinery manufacturing, bolting services, industrial maintenance, and on-site machining. its services include bolting solutions, in situ machining solutions, hot tapping and line stopping, and re-tubing.
FPT Fluid Power Technology S.r.l., established in 1966 and headquartered in Genoa, Italy, is a manufacturer of high-pressure hydraulic equipment from 700 to 4,000 bar. The company's products include lifting, bolting, and tensioning systems. It also offers both standard and custom-made products according to customer specifications. It has the latest generation of CNC machines for turning and milling to manufacture all components that are assembled and tested. The company has a quality management system certificate ISO 9001:2008. It serves various industries such as construction, mining, oil and gas, shipbuilding, and more.
TorcStark, established in 2000 and based in Dezhou City, Shandong, China, is a manufacturer of hydraulic torque wrenches. The company also produces other products, such as hydraulic wrench pumps, automatic wrench pumps, hydraulic pullers, and 3D adjustment systems, while offering solutions for tightening or loosening the bolts and moving and positioning projects. All of its products are used in bridges, oil fields, subways, and installation and maintenance of wind farms. The products manufactured are used in 170 wind farms across China and hold quality management system certificates to abide by the standards while manufacturing.
BOYA Precision Industrial Equipment CO. LTD, founded in 1999 in Xiangyang City, Hubei Province of China, is a manufacturer and supplier of precision tools, metallurgical machinery parts, and vehicle transmission parts. The company’s main products include flat metal rolling levelers, metal side shearing/trimming machines, flat metal finishing lines, coil coaters, and spare parts. Industries served include carbon steel, metal stamping, automobile, and non-ferrous markets, among others. The company’s marketing team covers over 30 cities and provinces in the country and also exports internationally to countries, such as India, Vietnam, South Korea, Russia, and France, among others.
Yinsh Precision Industrial Co. Ltd, founded in 1989, is a Taiwan-based manufacturer of precision parts and components, such as Yinsh locknuts, bearing lockouts, and precision lockouts for the aerospace, diagnostics, and defense industries. The company's other products include nuts, rods, chip wipers, grinding lockouts, and precision screws. This ISO 9001, ISO 14001, and OHSAS 18001 certified company also serves the photoelectric and plastic molding industries in more than 20 countries worldwide, including Taiwan, Mainland China, Germany, Spain, and the United States.
GMB Heavy Industries was established in 1981 and is based in Mississauga, Ontario, Canada, as a manufacturer, designer, and installer of turn-key solutions. The company's product portfolio includes Long Product Cooling Beds, Rolling Mill Gear Boxes, Shears, Interstands, and Transfer Systems and Bundlers. The products have diverse applications across various industries to efficiently cool and process long steel products, ensuring proper cooling and handling during the manufacturing process. The company caters to the steel, metalworking, automotive, construction, manufacturing, and fabrication industries.
Hangzhou Fuyang Tengming Industrial Co., Ltd, founded in 2011, is a China-based manufacturer of various hydraulic tools, including hydraulic pumps, hydraulic cylinders, hydraulic pullers, hydraulic bottling tools, and related hydraulic products and accessories. The company supplies and markets these industrial products and many more under the brand name ‘BELIUM’. The company is ISO 9001:2008 certified and its products are CE-compliant—making them suitable for use in industries such as biopharmaceuticals, chemical handling, water treatment, hygienic processing, food processing, and more.
Amtec Hydraclamp, based in Ontario, Canada, is a manufacturer of clamping and tensioning products. The company manufactures hydraulic clamps, clamping cylinders, tensioning tools, step nuts, block nuts, and other accessories. These products are widely used for applications, such as metal processing, rolling mills, casters, turbines, and many more. Custom hydraulic nuts and clamps are also available to address specific pre-tensioning or clamping needs using oil or grease as a pressure medium. These products are used by clients in America, Europe, Japan, China, and South Korea, among other countries.
SKF UK is the British division of SKF, originally founded in 1907 and headquartered in Gothenburg, Sweden. SKF designs, develops, and manufacturers bearings, seals, lubrication systems, and services worldwide, with industrial and automotive segments, providing solutions for industries including aerospace, agriculture, transportation, food and beverage, general machinery, material handling, mining, energy, paper, and wind energy. SKF UK offers rolling bearings, mounted bearings, automotive seals, lubrication management, vehicle aftermarket services, waste electric products, and electronic equipment products as well as services including maintenance, remanufacturing, customization, and training.
AS Tech Industrie- und Spannhydraulik GmbH is a manufacturer and supplier of heavy machinery hydraulic systems and equipment that was established in Geilenkirchen, North Rhine-Westphalia, Germany, in 1994. The company’s products include hydraulic bolt tensioners for tightening large-diameter bolts for high pre-loads, hydraulic cylinders that function as mechanical actuators, and hydraulic pumps for converting mechanical power into hydraulic energy. It also offers hydraulic nuts, fittings, and hoses for related applications or projects. The company’s products are used in the industrial processing sector.
ITH Bolting Technology headquartered in Meschede, Germany is a manufacturer and system supplier of bolting technology that distributes industrial bolting, torque wrenches, and tensioning tools solutions. The company’s bolting tool portfolio contains hydraulic bolt tensioning cylinders and hydraulic torque wrenches. They also offer bolting solutions for tightening and loosening industrial bolt connections from M16 (3/8’') and up. Additionally, they offer tension and torque tool rental. Their products are used in various industries such as wind energy, oil and gas, power generation, mining, and shipbuilding.
P.T. International, also known as PTI, was founded in 1994 and is headquartered in Charlotte, North Carolina. PTI is a distributor of European metric and American standard industrial power transmission products, serving the food/beverage, wood products, steel, automotive, and other industries. PTI’s 3 product segments are bearings, power transmission components, and linear products. PTI also offers value-added services including bearing forensics, private branding & custom labeling, custom projects, and new product designing. PTI is ISO 9001 certified.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | ITH Bolting Technology |
12.4%
|
| 2 | Hangzhou Fuyang Tengming Industrial Co., Ltd |
11.3%
|
| 3 | YINSH PRECISION INDUSTRIAL CO., LTD. |
9.3%
|
| 4 | FPT Fluid Power Technology S.r.l. |
8.2%
|
| 5 | GMB Heavy Industries |
7.2%
|
| 6 | P.T. International |
7.2%
|
| 7 | TorcStark |
6.2%
|
| 8 | Schaeffler Group USA Inc. |
6.2%
|
| 9 | BOYA |
5.2%
|
| 10 | Amtec Hydraclamp |
5.2%
|
Derivation Method
The ranking is calculated based on the click share within the hydraulic nut 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 (%) |
|---|---|---|
|
United States of America
|
5 | 38.5% |
|
China
|
3 | 23.1% |
|
Canada
|
2 | 15.4% |
|
Italy
|
1 | 7.7% |
|
Taiwan
|
1 | 7.7% |
|
Sweden
|
1 | 7.7% |
54 products found
54 products
Japan Pralad Co., Ltd.
610+ people viewing
Last viewed: 25 minutes ago
Standard Response
5.0 Company Review
■ Overview ・ The slogan of the hexagon to tighten is the side type. ・ Hydraulic nut ・ The hexagonal stick wrench type does not require any power...
10 models listed
Japan Pralad Co., Ltd.
570+ people viewing
Last viewed: 3 hours ago
Standard Response
5.0 Company Review
■ Overview ・ The slogan of the hexagon to tighten is the top type. ・ Hydraulic nut ・ The hexagonal stick wrench type does not require any power ...
9 models listed
Japan Pralad Co., Ltd.
1090+ people viewing
Last viewed: 1 hour ago
Standard Response
5.0 Company Review
■ No tightening tools are required A hydraulic nut is a groundbreaking nut that pulls by pulling the bolt with the hydraulic function of the nut it...
24 models listed
Atlas Copco UK Holdings Ltd
40+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
40+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
20+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
30+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
30+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
30+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
40+ people viewing
Last viewed: 2 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
20+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Atlas Copco UK Holdings Ltd
40+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
Titan Japan Co., Ltd.
40+ people viewing
Last viewed: 3 hours ago
■The nut itself is tightened. High precision work even in tight spaces A hydraulic nut is a device that uses the hydraulic pressure of the nut itse...
Atlas Copco UK Holdings Ltd
20+ people viewing
Last viewed: 3 hours ago
Standard Response
Versatile tensioning product ■Summary Hydraulic nuts replace existing hexagonal nuts and allow you to quickly and accurately apply uniform bolt lo...
