Nut style Multi-Jackbolt Tensioners from Superbolt are an innovative bolting product that will eliminate expensive and dangerous tooling. Only hand/air tools are required for installation and removal of any size tensioner.
Below are the available series. These are simply guidelines to choose the appropriate product for your application. When you contact us for a quote or to order, we will verify that the correct product is being purchased for your application.
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Medium Temperature: -50ºF to 650ºF
High Temperature: |
Standard Series: • MT - Standard Tensioners |
H1215 Torquenut™
Operating Temp: 650ºF to 1200 ºF
Description: H1215 high temperature Supernuts® have the smallest spotface design and will retrofit even the tightest nut spacing.
- Replaces “castle” and “acorn” nuts
- Smallest nut O.D., 1.5x stud dia.
- Most number of jackbolts
- Smallest diameter jackbolts
- Lowest jackbolt torque
- For stud sizes up to 6” dia and over
Prestress: Usually limited to 45,000 psi bolt stress.
Application Examples: Turbine control valve, HP turbine and valve.
H1216 Torquenut™
Operating Temp: 650ºF to 1200 ºF
Description: H1216 high temperature Supernuts® feature a slightly larger spotface than the H1215 Series. The H1216 is preferred to the H1215 if flange spotface room exists.
- Replaces “acorn” & “castle” nuts.*
- Intermediate series, 1.6x stud dia.
- Usually fewer jackbolts than 1215
- Some sizes have the same number of jackbolts as H1215 but of a larger dia.
- Some sizes can achieve higher preloads than the H1215 series
- For stud sizes up to 4” dia.
Prestress: 45,000 psi - 60,000 psi bolt stress.
*Usually the H1216 has a slightly larger OD than the original acorn or castle nut, but it can be used as long as spot face room is available on the flange.
Application Examples: IP turbine, Turbine stop valve.
H1218 Torquenut™
Operating Temp: 650ºF to 1200 ºF
Description: H1218 Supernut® high temperature Tensioners have the largest diameter of the three series. The larger diameter nut body permits larger diameter jackbolts, resulting in fewer jackbolts. This allows the H1218 to be installed and removed in the shortest time.
H1218 tensioners typically replace heavy hex nuts. They can also replace “acorn” and “castle” nuts if flange spotface room exists.
- Largest nut O.D., 1.8x stud dia.
- Least number of jackbolts
- Largest diameter jackbolts
- For stud sizes up to 2-3/4” dia.
Prestress: 45,000 psi - 60,000 psi. Higher prestress available with custom design.
Application Examples: Turbine control valve, High pressure steam flange.