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Multi-stage Bolt Tensioners

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Multi stage bolt tensioners

Wind Multi Stage Hydraulic Tensioners

ABS Multi-Stage Bolt Tensioners are small hydraulic stud tools made to get very high preload in tight spaces.

At first made for wind turbine bolts and slewing rings, ABS took these Duo-series tensioners for important flange and structural fastenings all over Saudi Arabia’s oil & gas power and industrial areas. Their slim design that splits on top makes putting tools in nacelles or overhead headers easier— saving time making things safer and improving joint reliability.

 

SPECIFICATIONS 

Maximum Tensioner Load (kN) / (lbf)                      2244 / 494,560
Minimum Tensioner Load (kN) / (TONF)                  288 / 64,742
Bolt Dia (inch) / (metric)                                           1" - 2 1/2" / M24 - M64
Tool Height (mm)                                                       185 - 376

PRODUCT CATALOGUE 

 ABS Multi-Stage Tensioner

 

MODEL BOLT DIA MAX. LOAD TENSIONER DIA TENSIONER HEIGHT TENSIONER STROKE
  inch mm kN  lbf inch mm inch mm inch mm
HFMT-24 1” M24 288 64,742 2.36 60 7.4 185 0.28 7
HFMT-27 1-1/8" M27 375 84,300 2.6 66 7.62 193.5 0.28 7
HFMT-30 1-1/8" M30 462 1,03,858 2.83 72 7.91 201 0.28 7
HFMT-33 1-1/4" M33 572 1,28,586 3.07 78 8.5 216 0.31 8
HFMT-36 1-3/8" M36 670 1,50,616 3.25 82.5 9.04 229.5 0.39 10
HFMT-39 1-1/2" M39 802 1,80,290 3.62 92 10.31 263 0.39 10
HFMT-42 1-5/8" M42 920.5 2,06,928 3.86 98 10.31 262 0.39 10
HFMT-45 1-3/4" M45 1082 2,43,234 4.13 105 10.91 281.5 0.39 10
HFMT-48 1-7/8" M48 1222 2,74,706 4.37 111 11.56 293.5 0.39 10
HFMT-52 2" M52 1452 3,26,410 4.72 120 12.8 327 0.39 10
HFMT-56 2-1/4" M56 1675 3,76,540 5.04 128 12.99 330 0.39 10
HFMT-64 2-1/2” M64 2244 4,94,560 5.83 146 14.23 376 0.47 12

 

Key Advantages

Slim, high-load profile: Made to reach bolts deep inside flanges that are hard to get at using a low radial cross-section— perfect for turbine nacelles or tight pipeline headers.

Multi-stage piston system: Gives safe pre-loads on big stud bolts without needing large tools.

Spring-loaded gear-driven nut run-down: Makes getting the reaction nut on faster while cutting down operator tiredness. A positive noise-lock lets you know it’s seated right.

Over-stroke limiter and auto piston return: Stops seal damage when tensioning; next cycles start quickly and as expected.

Dual hydraulic ports: Twin-port models let you gang three or more tensioners off one hydraulic pump to tension at the same time.

 

Why Gulf Industries Trust ABS

ABS Multi-Stage tensioners meet Saudi Aramco SABIC Ma’aden and Gulf EPC joint integrity specs. Every tool is made pressure-tested and calibrated at ISO 17025-grade places with traceable certification. The design is compact, has a corrosion-resistant coating, plus over-stroke protection making them very reliable in Arabia’s tough desert and coastal places.

 

Industries We Serve in Saudi Arabia

  • Wind Energy – blade hub/stator and yaw mechanism flanges
     
  • Oil & Gas – compact turbine flange bolt tensioning on well‑heads and compressors
     
  • Petrochemical & Chemical – exchanger headers, high-load vessel flanges
     
  • Power Generation – CCGT rotor couplings, nacelle and HRSG bolt joints
     
  • Heavy Industrial & Infrastructure – railway slewing rings, wind tower anchor bolts, civil girder joins

 

Ideal Applications

  • Field or workshop tensioning where radial clearance is restricted
     
  • Situations demanding full preload uniformity across multiple bolts
     
  • Confined or overhead bolting zones (e.g. platform skids, missile factory machinery)
     
  • Multi-stud flange preparations during shutdowns, turnarounds, or bolt-up operations


After‑Sales & Rental Services (Saudi Arabia)

  • Calibration & certification in Dammam & Jeddah labs (or mobile vans) with full ISO traceability reports—typically within 48 hours
     
  • Dry‑hire kits available by port or flange size, with hoses, gauges and reaction bridges
     
  • Operator training delivered onsite or at ABS Gulf training centres; parts stocked in Riyadh, plus 24×7 support via WhatsApp/phone

    Email: Mrashid@absgroup‑arabia.com
    Phone :  (+966) 509 775 727

 

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People Also Ask

The duo series multi-stage tensioners are versatile hydraulic bolt tensioners suitable for high load and tight space applications. They are optimized for use on wind turbines and designed for long-life, low-maintenance applications in various industries, including slewing rings, power generation, structural, and critical bolting.

duo Hydraulic Tensioners feature fast spring piston retract, geared nut run-down, and spring-located sockets, contributing to improved process time during each tensioning operation. This design prioritizes both speed and efficiency in the tensioning process.

duo Hydraulic Tensioners prioritize safety with an optional durable TWIST-GRIP handle integrated over the hydraulic connection. This not only facilitates easy handling and positioning of the tool but also protects the hose and inlet connection from unnecessary loading, providing an additional layer of safety. High cycle life, over-stroke protection, and the latest seal technology ensure low maintenance operation.

duo tensioners offer a range of options and features, including special threads, special load requirements, twin or single port configurations, protective handle, special bridge for tight clearances, swivel connections, cycle counter, gear drive nut run-down, spring piston return, misalignment compensation, and ARMOURMAX anti-corrosion, anti-wear coating.

- Multi-stage hydraulic bolt tensioners are designed for applications requiring sequential tensioning, allowing controlled tightening of bolts in multiple stages.

- Hydraulic tensioners operate by using hydraulic pressure to extend a piston, applying tension to the bolt. Multi-stage tensioners allow for sequential tensioning, improving control and accuracy.

The load loss factor in bolt tensioning refers to the reduction in tension force over time due to various factors, such as material relaxation, joint settling, and external loads. It quantifies the loss of preload in a bolted joint, impacting the joint's overall integrity.

Bolt tensioning is essential for achieving and maintaining the required clamping force in bolted joints. Proper tensioning ensures joint integrity, preventing issues like leakage, gasket damage, and joint failure. It enhances safety, reliability, and the overall performance of the assembly.

Advanced Bolting Solutions (ABS) has led the bolting industry with precision and innovation. Specializing in torquing (up to 72,000 Nm), tensioning (nut sizes up to 6 inches), flange management, and automation, we deliver tailored solutions for every project. Our ECITB-trained experts offer on-site machining, rentals, and globally recognized training through the ABS Training Academy.

Business Address:
C/o Diversified Lines Petroleum Services Co. Abu Al Hasan Al Zahrawy Street, Khalidiya Shumaliya, Dammam - 32231, Saudi Arabia.
(+966) 509775727
Mrashid@absgroup-arabia.com

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