HTN Imperial Range

The Hi-Force HTN range of imperial top collar hydraulic nuts is specifically designed and manufactured for applications where regular, periodic opening of the joint, for inspection and maintenance purposes is required. Unlike conventional hydraulic bolt tensioners, Hi-Force HTN series hydraulic nuts are designed to permanently replace standard hexagon nuts, on one side of the bolted joint. Initially the bolt tension or elongation is applied hydraulically and once achieved, it is permanently retained via the integral mechanical load retaining collar.

Standard range models are available for imperial bolt sizes from 1” to 4”, with other sizes available to special order. All models are 1500 bar maximum working pressure and supplied with quick connect hydraulic couplings, compatible for use with Hi-Force air or manually operated hydraulic bolt tensioner pumps and hoses.

  • Capacities from 198 to 1911 kN
  • Bolt sizes from 1" to 4" diameter
  • Working pressure 1500 bar
  • Single acting design with integral load holding lock nut
  • High grade alloy steel construction
  • Nitrocarburised piston
  • Visible maximum piston stroke indicator
  • Dual quick connect couplings for easy connection

Hydraulic Tensioner Nuts Imperial Range
Model Number Bolt Size Capacity Effective area cm2 Stroke mm Weight kg Tommy Bar
kN tonnes
HTN1-100 1" - 8 UN 198 20.2 13.2 5 1.9 TTB06
HTN2-112 1 1/8" - 8 UN 216 22.1 14.4 5 2.0 TTB06
HTN3-125 1 1/4" - 8 UN 253 25.8 16.9 5 2.4 TTB06
HTN4-137 1 3/8" - 8 UN 304 31.2 20.4 5 2.7 TTB06
HTN5-150 1 1/2" - 8 UN 344 35.1 22.9 6 2.9 TTB06
HTN6-162 1 5/8" - 8 UN 398 40.5 26.5 6 3.5 TTB06
HTN7-175 1 3/4" - 8 UN 475 48.4 31.7 6 4.0 TTB06
HTN8-187 1 7/8" - 8 UN 501 51.1 33.4 6 4.2 TTB06
HTN9-200 2" - 8 UN 5634 57.5 37.6 6 4.9 TTB06
HTN10-225 2 1/4" - 8 UN 746 76.1 49.8 8 6.4 TTB06
HTN11-250 2 1/2" - 8 UN 905 92.3 60.3 8 8.0 TTB06
HTN12-275 2 3/4" - 8 UN 1000 101.9 66.7 8 8.8 TTB08
HTN13-300 3" - 8 UN 1203 122.7 80.2 8 10.6 TTB08
HTN14-325 3 1/4" - 8 UN 1414 144.1 94.3 10 12.9 TTB08
HTN15-350 3 1/2" - 8 UN 1605 163.6 107 10 16.2 TTB10
HTN16-375 3 3/4" - 8 UN 1705 173.8 113.6 10 18.3 TTB10
HTN17-400 4" - 8 UN 1911 194.9 127.4 10 21.9 TTB10

Note: Tommy bars are not included. Hi-Force recommends one tommy bar for every four tensioners. 


Model Number Dimensions in mm
A B C D
HTN1-100 72 55 18 132
HTN2-112 75 55 18 132
HTN3-125 82 57 21 134
HTN4-137 88 57 22 135
HTN5-150 93 58 21 135
HTN6-162 100 62 23 142
HTN7-175 106 64 24 141
HTN8-187 110 64 25 142
HTN9-200 117 67 32 145
HTN10-225 128 74 28 152
HTN11-250 141 77 29 155
HTN12-275 150 78 30 156
HTN13-300 162 81 31 159
HTN14-325 174 87 35 165
HTN15-350 187 95 37 173
HTN16-375 194 102 39 179
HTN17-400 205 110 41 188