HFHN Series Hydraulic Nuts

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Hydraulic Nut - The Permanent Solution for Precision Tensioning

Hydraulic Nuts

Hydraulic Nut - The Permanent Solution for Precision Tensioning

The ABS HFHN Series replaces conventional hex nuts with a self-contained tensioning system. By integrating a hydraulic cylinder and mechanical locking mechanism directly into the nut, it provides the accuracy of axial tensioning as a permanent fixture. Ideal for limited-space applications, it eliminates friction and torque scatter while remaining on the stud for the life of the joint.

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Specifications
Minimum Tensioner Load (kN) / (tonf)
152 / 15.2
Maximum Tensioner Load (kN) / (tonf)
6548 / 657.2
Bolt Thread Size (metric) / (imperial)
7/8" / M22 - M150
Weight (kg)
0.7 - 88.7
Mechanical Load Retention
 Lock ring secures precise bolt load indefinitely.
Extreme Accessibility
 Compact design fits extremely low-clearance areas.
Non-Destructive Removal
 Hydraulic release ensures effortless, damage-free disassembly.
Friction-Free Accuracy
 Pure axial tensioning eliminates torque-based inaccuracies.
Maintenance Efficiency
 Dramatically reduces downtime during periodic equipment servicing.

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Whether you need to purchase the HFHN Series for your inventory or opt for a Dry or Supervised Rental for a specific project

Contact ABS for a quote or demo: marketing@absgroup.in | +91-8282829795

The HFHN Series is built for long-term use in high-load, extreme low-clearance environments.

Metric

Bolt Thread Size

Max. Load (kN / tonf)

Max. Pressure (Bar)

Minimum

M22 / 7/8″

152 kN / 15.2 tonf

1500

Maximum

M150 / 6″

6,548 kN / 657.2 tonf

1500

Related Products

The ABS tensioning pumps redefine bolting operations by delivering precise and controlled force for consistent and accurate bolt tensioning. Available in manual, electric, and pneumatic models, these pumps are designed to meet diverse operational needs across industries. Their advanced precision minimizes the risk of over- or under-tightening, effectively preventing joint failures and component damage—setting ABS apart from traditional tensioning methods.Going beyond conventional practices, our pumps enhance safety, versatility, and ease of use in every bolting application. ABS pumps are ergonomically designed, lightweight, and compact, ensuring comfortable handling even in constrained spaces. Their robust construction and compatibility with various hydraulic tensioners enable efficient operation across a wide range of bolt sizes and applications—delivering superior safety, reliability, and operational efficiency in every task.

HX Series Hydraulic Hand Pumps

The ABS HX Series provides reliable hydraulic power for bolt tensioning without external power. Its two-stage design ensures efficiency by reducing strokes to reach high pressure. Lightweight and durable, it’s perfect for portable, precise onsite applications.

HX Series Hydraulic Hand Pumps

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Frequently Asked Questions

You will find answers to about our various industries and industry specialists service and more. Please feel
free to contact us if you don't get your question's answer in below.

A hydraulic nut is a precision bolting device used to apply accurate and uniform preload to large bolts and studs. It works by applying hydraulic pressure to a piston inside the nut, which stretches the bolt to the required tension. Once the correct load is achieved, a lock nut is tightened mechanically, and the hydraulic pressure is released—leaving the bolt securely tensioned.

Hydraulic nuts are used in applications where high bolt loads, safety, and precision are critical. Typical uses include flange connections, pressure vessels, turbines, compressors, wind towers, offshore structures, and heavy machinery. They are especially useful where conventional torque tightening is inaccurate or unsafe.

Hydraulic nuts provide precise bolt tensioning, reduce friction-related errors, and eliminate guesswork associated with torque tightening. Key advantages include uniform load distribution, faster installation, improved safety, reduced operator fatigue, and repeatable results, making them ideal for critical bolted joints.

Selection depends on stud size, thread pitch, required preload, available clearance, operating pressure, and environmental conditions. It is also important to consider material compatibility and industry standards. Consulting with a hydraulic bolting specialist ensures the correct model and pressure rating for your application.

Yes, hydraulic nuts are fully reusable and designed for long service life when used correctly. Routine maintenance includes seal inspection, cleaning, and proper storage. With regular maintenance, hydraulic nuts maintain accuracy and performance over repeated tightening cycles.

Hydraulic nuts are widely used in oil & gas, power generation, wind energy, petrochemical plants, steel mills, cement plants, shipbuilding, and heavy engineering industries—anywhere large-diameter or high-load bolting is required with maximum reliability.
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