Multi-Jackbolt Tensioners - Nut Style
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 situation. Thank you for your interest!

Standard Series:
• MT
• CY
• MTSX
• SJX - Jamnuts
• SMX - Mill Motor Nuts
• NI - Bearing Locknuts
• MTA - Armored
• CN - Crosshead Jamnut
• SP - Piston End Nut
• SX8 - Flexnuts
• SX12 - High Strength Flexnuts

Medium Temperature Products (-50ºF to 650ºF):
• H650
• H650X
• H650T
• H650TX

High-Temperature Products (650ºF to 1200ºF):
• H1215
• H1216
• H1218

H650 - Torquenuts™
• Operating Temp: -50ºF to 650 ºF • Graphite Lubricant
• Tensioner Body Material: ASTM-A193-B7

• Description: H650 tensioners are used for medium temperature, pressure vessel applications on A193-B7 bolts and studs. Material certification provided upon request. Preload and torque values are based on 45,000 psi bolt stress, the value most commonly used by pressure vessel designers. Depending on operating temperature, jackbolt torque and preload may be increased.

• Application Examples:

H650X - Torquenuts™
• Operating Temp: -50ºF to 650 ºF • Moly Lubricant
Tensioner Body Material: ASTM-A193-B7

• Description:
- Fewer jackbolts
- Bigger jackbolts
- Moly lubricant to reduce torque

• Application Examples: Boiler feed pumps, boiler circulating pumps, reactors, heat exchangers, etc.

H650T - Torquenuts™
• Operating Temp: -50ºF to 650 ºF • Graphite Lubricant
• Tensioner Body Material: ASTM-A193-B7

• Description: H650T torquenuts™ replace “acorn” and “castle” nuts and are intended for use where space is limited. They are lubricated with JL-G graphite lubricant.

• Application Examples:

H650TX - Torquenuts™
• Operating Temp: -50ºF to 650 ºF • Moly Lubricant
• Tensioner Body Material: ASTM-A193-B7

• Description: H650TX torquenuts™ replace “acorn” and “castle” nuts and are intended for use where space is limited.

• Application Examples: