HTN

HTN Imperial Range

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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 21750 psi 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 22.3 to 214.8 tons
  • Bolt sizes from 1" to 4" diameter
  • Working pressure 21750 psi
  • Single acting design with integral load holding lock nut
  • High grade alloy steel construction
  • Nitrocarburized piston
  • Visible maximum piston stroke indicator
  • Dual quick connect couplings for easy connection
  • Customized and special design tensioners are available on request
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Hydraulic Tensioner Nuts Imperial Range
Hydraulic Tensioner Nuts Imperial Range
Model Number Bolt Size Capacity Effective area inch2 Stroke inch Weight lbs Tommy Bar
kN Tons
HTN1-100 1" - 8 UN 198 22.3 2.05 0.2 4.2 TTB06
HTN2-112 1 1/8" - 8 UN 216 24.3 2.24 0.2 4.4 TTB06
HTN3-125 1 1/4" - 8 UN 253 28.4 2.61 0.2 5.3 TTB06
HTN4-137 1 3/8" - 8 UN 306 34.4 3.16 0.2 6.0 TTB06
HTN5-150 1 1/2" - 8 UN 344 38.7 3.56 0.24 6.4 TTB06
HTN6-162 1 5/8" - 8 UN 398 44.7 4.11 0.24 7.7 TTB06
HTN7-175 1 3/4" - 8 UN 475 53.4 4.91 0.24 8.8 TTB06
HTN8-187 1 7/8" - 8 UN 501 56.3 5.18 0.24 9.3 TTB06
HTN9-200 2" - 8 UN 564 63.3 5.82 0.24 10.8 TTB06
HTN10-225 2 1/4" - 8 UN 746 83.9 7.71 0.32 14.1 TTB06
HTN11-250 2 1/2" - 8 UN 905 101.7 9.35 0.32 17.6 TTB06
HTN12-275 2 3/4" - 8 UN 1000 112.3 10.33 0.32 19.4 TTB08
HTN13-300 3" - 8 UN 1203 135.2 12.44 0.32 23.4 TTB08
HTN14-325 3 1/4" - 8 UN 1414 158.9 14.61 0.39 28.4 TTB08
HTN15-350 3 1/2" - 8 UN 1605 180.3 16.59 0.39 35.7 TTB10
HTN16-375 3 3/4" - 8 UN 1705 191.5 17.61 0.39 40.3 TTB10
HTN17-400 4" - 8 UN 1911 214.8 19.75 0.39 48.3 TTB10

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


Model Number Dimensions in inch
A B C D
HTN1-100 2.84 2.17 0.71 5.2
HTN2-112 2.96 2.17 0.71 5.2
HTN3-125 3.23 2.25 0.83 5.28
HTN4-137 3.47 2.25 0.87 5.32
HTN5-150 3.66 2.29 0.83 5.32
HTN6-162 3.94 2.44 0.91 5.59
HTN7-175 4.18 2.52 0.95 5.56
HTN8-187 4.33 2.52 0.99 5.59
HTN9-200 4.61 2.64 1.26 5.71
HTN10-225 5.04 2.92 1.1 5.99
HTN11-250 5.56 3.03 1.14 6.11
HTN12-275 5.91 3.07 1.18 6.15
HTN13-300 6.38 3.19 1.22 6.26
HTN14-325 6.86 3.43 1.38 6.5
HTN15-350 7.37 3.74 1.46 6.82
HTN16-375 7.64 4.02 1.54 7.05
HTN17-400 8.08 4.33 1.62 7.41