Riverhawk Externally Tensioned Nut

externally tensioned not riverhawk photo

With the Externally Tensioned Nut, Riwerhawk's engineering team has come up with a brilliant solution for replacing torqued hardware with tensioned hardware. This has previously not been possible, except with a lot of thread protruding above the nut.

Use the Externally Tensioned Nut together with the Riverhawk Bolt Tensioner for applications without exposed threads above the existing nut. The design of the Externally Tensioned Nut allows it to fit inside the clearance envelope of an ANSI standard heavy hex nut.

Tens. Frm. Size Model No. Nominal Thread Diameter 'A' Outside Diameter 'D' Tensioner Thread Diameter 'B' Height 'C' Preload* Nut Weight Tensioner Outside Diameter
inch cm inch cm inch cm inch cm lb kg lb kg inch cm
2 ETN-1375 1.375 3.493 2.42 6.147 2.000 5.080 1.44 3.658 79,600 36,106 1 0.45 4.06 10.312
3 ETN-1500 1.500 3.810 2.63 6.680 2.125 5.398 1.75 4.445 94,000 42,638 1.3 0.59 5.41 13.741
3 ETN-1625 1.625 4.128 2.84 7.214 2.312 5.872 1.88 4.775 110,000 49,895 1.7 0.77 5.41 13.741
3 ETN-1750 1.750 4.445 3.06 7.772 2.500 6.350 2.00 5.080 127,000 57,606 2.1 0.95 5.41 13.741
3 ETN-1875 1.875 4.763 3.28 8.331 2.625 6.668 2.19 5.563 143,600 65,136 2.5 1.13 5.41 13.741
4 ETN-2000 2.000 5.080 3.50 8.890 2.875 7.303 2.25 5.715 165,100 74,888 3.1 1.41 7.00 17.780
4 ETN-2250 2.250 5.715 3.94 10.008 3.250 8.255 2.63 6.680 195,000 88,450 4.6 2.09 7.00 17.780
4 ETN-2500 2.500 6.350 4.38 11.125 3.500 8.890 3.25 8.255 262,000 118,841 6.7 3.04 7.00 17.780
5 ETN-2750 2.750 6.985 4.70 11.938 3.875 9.843 3.38 8.585 298,400 135,352 8.1 3.67 8.11 20.599
6 ETN-3000 3.000 7.620 5.19 13.183 4.250 10.795 3.96 10.058 384,000 174,179 11.6 5.26 10.21 25.933
6 ETN-3250 3.250 8.255 5.53 14.046 4.500 11.430 4.19 10.643 430,400 195,226 13.5 6.12 10.21 25.933
7 ETN-3500 3.500 8.890 6.13 15.570 5.000 12.700 4.63 11.760 529,000 239,950 19.1 8.66 10.80 27.432
8 ETN-3750 3.750 9.525 6.56 16.662 5.375 13.653 4.75 12.065 579,000 262,630 22.4 10.16 12.00 30.480
9 ETN-4000 4.000 10.160 7.00 17.780 5.750 14.605 5.00 12.700 662,000 300,278 27.4 12.43 13.20 33.528
  • Easy and trouble-free Installation
    • Can be done by one person
  • Support for easy retrofitting
    • Go from Torquing to Tensioning, keeping the existing studs
    • Radial footprint the same as for the existing nut
    • Can replace any existing nut (e.g. hex, 12 point, cap,)
  • Material substitution available for special applications
    • Various nut materials are available to optimize for higher loads or temperatures tolerance
  • Extended stud thread is NOT needed
    • ID has been threaded to fit the existing stud, and threaded on the OD, allowing the tensioner to grip the stud being tensioned
Link multiple tools together for simultaneous tensioning
Each individual nut is tested at maximum pressure before delivery
The standard externally tensioned nut will fit inside the clearance envelope of an ANSI standard heavy hex nut.
Every unit comes with a detailed instruction manual
* Preload capability is based upon a stud efficiency of 1.25.
Custom designs and materials are available if standard design doesn't accomodate your application

We do offer customization of the Externally Tensioned Nut, such as a smaller envelope, higher loads in the stud or tolerance for extreme temperatures. Do contact us for a discussion of the possibilities.