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STU Metric
Hi-Force STU series sub-sea bolt tensioners are designed and manufactured to suit the demanding requirements of divers operating in harsh sub-sea environments. With an easy to operate two piece design comprising of a quick fit/release threaded puller and a hydraulic load cell with integral bridge and an extra long 30 mm piston stroke to reduce re-setting operations, Hi-Force STU series sub-sea bolt tensioners offer a consistent, reliable and cost effective method of tensioning sub-sea bolted joints. All hydraulic load cells are suitable for different thread sizes and interchangeable quick fit/release pullers can be ordered separately, as required, resulting in even greater flexibility and cost savings.
  • Capacities from 256 to 2482 kN
  • Bolt sizes M24 to M90 diameter
  • Working pressure 1500 bar
  • Single acting design with manual piston retraction
  • High grade alloy steel construction
  • Simple two piece design for easy operation by divers subsea
  • Visible maximum piston stroke indicator
  • Dual quick connect couplings for easy connection
  • Designed to fit most sizes of ANSI and API flanges and some Compact flanges
  • Interchangeable quick fit pullers to cover secondary bolt sizes for each STU model
  • Customised and special design tensioners are available on request
Specifications
Model Number Quick fit puller Bolt Thread Size Capacity Effective area cm2 Stroke mm Weight kg Tommy Bar
kN tonnes
STU1-24 QFP1-24 M24 x 3 256 26.1 17.1 20 3.4 TTB06
STU1-27 QFP1-27 M27 x 3 256 26.1 17.1 20 3.4 TTB06
STU2-30 QFP2-30 M30 x 3.5 430 43.9 28.7 30 6.0 TTB08
STU2-33 QFP2-33 M33 x 3.5 430 43.9 28.7 30 6.0 TTB08
STU2-36 QFP2-36 M36 x 4 430 43.9 28.7 30 6.0 TTB10
STU3-39 QFP3-39 M39 x 4 553 50.4 36.89 30 7.5 TTB10
STU3-42 QFP3-42 M42 x 4.5 553 50.4 36.89 30 7.5 TTB10
STU4-45 QFP4-45 M45 x 4.5 756 77.1 50.4 30 9.8 TTB10
STU4-48 QFP4-48 M48 x 5 7560 77.1 50.4 30 9.8 TTB12
STU5-52 QFP5-52 M52 x 5 1168 119.1 77.9 30 14.5 TTB12
STU5-56 QFP5-56 M56 x 5.5 1168 119.1 77.9 30 14.5 TTB14
STU6-60 QFP6-60 M60 x 5.5 1649 168.1 109.9 30 22.8 TTB14
STU6-64 QFP6-64 M64 x 6 1649 168.1 109.9 30 22.8 TTB16
STU6-68 QFP6-68 M68 x 6 1649 168.1 109.9 30 22.8 TTB16
STU6-72 QFP6-72 M72 x 6 1649 168.1 109.9 30 22.8 TTB16
STU7-76 QFP7-76 M76 x 6 2483 253.2 165.6 30 35.6 TTB16
STU7-80 QFP7-80 M80 x 6 2483 253.2 165.6 30 35.6 TTB16
STU7-85 QFP7-85 M85 x 6 2483 253.2 165.6 30 35.6 TTB16
STU7-90 QFP7-90 M90 x 6 2483 253.2 165.6 30 35.6 TTB16

Note: Tommy bars are not included. Hi-Force recommends one tommy bar for every four tensioners. Please note that the tommy bar listed will fit related quick fit puller; a different size may be required for the drilled hexagon nut.

Dimensions
Model Number Dimmensions in mm
A B C D E F
STU1-24 82 22 119 119 140 61
STU1-27 82 22 119 119 140 64
STU2-30 102 30 140 140 164 73
STU2-33 102 30 140 140 164 75
STU2-36 102 30 140 140 164 78
STU3-39 114 35 142 142 169 82
STU3-42 114 35 142 142 169 85
STU4-45 128 41 151 151 181 94
STU4-48 128 41 151 151 181 98
STU5-52 150 48 164 164 202 112
STU5-56 150 48 164 164 202 116
STU6-60 176 60 183 183 231 136
STU6-64 176 60 183 183 231 136
STU6-68 176 60 183 183 231 136
STU6-72 176 60 183 183 231 141
STU7-76 215 89 215 215 260 164
STU7-80 215 89 215 215 260 164
STU7-85 215 89 215 215 260 175
STU7-90 215 89 215 215 260 175
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