297.6 ton (2,649Kn) capacity top side stud bolt tensioner for 3-1/4" bolt size


  • Single acting design with manual piston retraction
  • High grade alloy steel construction with nitrocarburized, corrosion resistant, piston
  • Maximum stroke indicator to warn against piston over stroke
  • Self-energizing seals for improved performance and longevity of use at high pressure
  • Dual quick connect inlet and outlet couplers for easy multiple tensioner connection
  • Designed to fit ANSI and API flanges and compact flanges
  • Interchangeable accessories to cover multiple stud bolt sizes using the same tensioner
  • Non-standard size threaded pullers available to order on short delivery lead time


Download Full Product Specifications


The STS standard bolt tensioner range is designed for topside operation in a wide variety of applications including pipeline flanges, heat exchangers, pressure vessels, compressor covers, boiler feed pumps, anchor bolts and many others. The range consists of 26 standard size options ranging from 3/4" (M16) to 4” (M100) thread size and all models are suitable for working pressures up to 21750 PSI. Each of the 6 models of hydraulic tensioning lpad cell (or cylinder) can be operated with a variety of threaded pullers and nut rotating sockets ensuring that the maximum possible range of bolt sizes can be accommodated using a minimum number of hydraulic cylinders. Threaded pullers, bridges and nut rotating sockets are also available as individual components . All Hi-Force hydraulic bolt tensioners are designed and manufactured to include a wear coated piston, maximum piston stroke indicator, self-energizing high pressure seals and dual quick connect couplings for easy multiple tensioner connection. Suitable manual, electric and air driven hydraulic pumps, high pressure hoses and couplings for use with Hi-Force bolt tensioners are also available.

STS6-325B1 Topside Hydraulic Bolt Tensioner

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    12335 Kingsride Lane #422

    Houston, TX 77024


    1106 Wisterwood Dr. Unit H

    Houston, TX 77043

    5408 E Loop 250 N Unit B Midland, TX 79705