Standard Tensioners image

HexForce Standard Bolt Tensioners

The HexForce standard lineup presents versatile and reliable hydraulic tensioners tailored to a wide array of bolting tasks. Primed for topside operations, they shine in tightening commonly utilized flanges such as ANSI, ASME, and API standards.


Maximum Tensioner Load (kN) / (TONF)                 4903 / 500
Minimum Tensioner Load (kN) / (TONF)                  233 / 23.8
Bolt Thread Size (inch) / (metric)                              3/4 - 5 3/4" / M16 - M150
Maximum Pressure (bar)                                            1500


 AOGS Standard Tensioner

  inch mm TONF kN mm² bar mm A B C D E F
HFST-11 - M16 233 23.8 1555 1500 12 72 31 64 79.3 44 74
3/4" M20
7/8" M22
1" M24
1-1/8" M27
HFST-12 1-1/8" M27 443 44 2884 1500 15 108 42 89 101.2 58.1 102.1
- M30
1-1/4" M33
1-3/8" M36
1-1/2" M39
HFST-13 1-1/2" M39 791 80 5271 1500 15 136 54 89 116 58 132.47
1-5/8" M42
1-3/4" M45
1-7/8" M48
2" M52
HFST-14 2" M52 1267 129 8445 1500 15 172 65.5 102 119.5 58 162
2-1/4" M56
2-1/2" M64
HFST-15 2-1/2" M64 1830 186 12197 1500 15 200 76 98 131 64 187
2-3/4" M72
3" M76
HFST-16 3" M76 2502 255 16682 1500 15 235 94 125 163 68 218
3-1/4" M80
3-1/2" M90
HFST-17 3-1/2" M90 2629 268 17530 1500 15 245 102 125 148 66 245
3-3/4" M95
4" M100
HFST-18 4" M100 3802 387.7 25349 1500 15 286 122 133 157 73 284
4-1/2" M110
5" M125
HFST-19 5" M125 4903 500 32688 1500 15 335 143 165 191 78 325
5-1/4" M130
5-3/4" M150

Ensure the Security of Your Flange Connections: Introducing Our Premium Flange Tensioners

Addressing Standard and Challenging Applications:

Our extensive lineup of flange tensioners provides a solution for virtually every project. Standard tensioners, operating at a maximum pressure of 1500 bar, are tailored to fit most ANSI B 16.5, 16.47, and API flanges. Additionally, for scenarios with spatial constraints or exceptionally high load demands, we offer custom-built tensioners designed to seamlessly integrate with your unique requirements.

Crafted for Endurance, Engineered for Performance:

These industrial-grade tensioners are meticulously crafted with a focus on durability and longevity. Equipped with suitable surface protection, they are adept at withstanding demanding conditions and harsh environments, ensuring an extended and dependable service life.

Prioritizing Safety and User Assurance:

Comprehensive Safety Manual: We prioritize user safety by providing a clear and concise Health and Safety Operating and Instruction Manual. Featuring easily understandable graphical illustrations, this manual outlines proper equipment usage, maintenance protocols, and crucial operating pressure information.

Expert Support: Our dedicated team is readily available to address any technical inquiries you may have regarding the equipment or its specific applications. We are committed to furnishing you with the guidance and assistance necessary to instill confidence throughout the flange tensioning process.

Understanding the Key Components:

The foundational functionality of our tensioners hinges on a blend of essential components:

Hydraulic Cylinder: Generates the requisite force for effective bolt tensioning.

Socket: Establishes a secure connection to the specific bolt size and type.

Bridge: Establishes a stable platform for optimal force dispersion.

Puller: Applies the hydraulic force generated by the cylinder through the bridge and socket for tensioning.

Adaptor Set (Optional): Offers added versatility with interchangeable sockets, bridges, and pullers, catering to a broader array of flange configurations.

Unrivaled Safety Measures:

Cutting-Edge Seal Technology: We integrate cutting-edge seal technology to forestall leaks and uphold operational integrity. This minimizes the likelihood of accidents and equipment malfunctions, placing safety at the forefront of every application.

Long Stroke Design: Our tensioners feature a long stroke design, facilitating efficient and precise bolt tensioning across a diverse range of applications.

Invest in Assurance with Our Flange Tensioners:

Our steadfast commitment to safety, reliability, and adaptability renders our flange tensioners the ideal choice for your demanding bolting endeavors. Reach out to us today to explore your specific requirements and discover how our solutions can facilitate secure and efficient flange connections.




The tensioner plays a crucial role in maintaining the proper amount of tension in the belt to ensure synchronous drive. Incorrect tension, whether too loose or too tight, can lead to severe engine failure. Tensioners are available with either manual or automatic adjustment options.

There is no recommended timeframe in which to replace your tensioner, especially as the belt itself usually needs replacing before the tensioner does. However, you should inspect your tensioner each time you service your car to monitor its condition and replace it if necessary.

Standard tensioners typically operate at a maximum pressure of 1500 bar.

Our standard tensioners are specifically designed to fit most commonly used ANSI B 16.5, 16.47, and API flanges.

Standard tensioners are ideal for a wide range of applications. However, for situations with limited space or exceptionally high load requirements, custom-built tensioners might be necessary.

Standard tensioners are well-suited for various bolting projects involving standard flange sizes in industries like: Oil & Gas, Chemical Processing, Power Generation, Shipbuilding, General Construction.

While standard tensioners offer a good range of compatibility, they might not fit every unique flange configuration. An adaptor set (optional) might provide some versatility, but for highly customized needs, custom-built tensioners are the best option.

A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring-loaded bicycle chain tensioner, the tension it creates.

Here's how it works: Spring Force: The spring mechanism in the tensioner generates a consistent force. This force is applied to the tensioner arm, which in turn presses the pulley against the belt. The tensioner arm is designed to move, allowing the pulley to adjust its position and maintain the desired tension.

On circular flanges, the recommended use is of at least four Hydraulic Stud Tensioners and, preferably, 25% or 50% cover. For example, on a flange with 36 studs, use four, nine (25% cover), or eighteen (50% cover) Hydraulic Stud Tensioners. For accuracy and speed, some applications require 100% “cover”.