Multi-Jackbolt Tensioners - Bolt 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!

SB8 - Torquebolt™ Series
• Operating Temp: -50ºF to 500ºF

• Description: Torquebolts™ are most often used for applications with tapped holes. Additionally, the diameter of the torquebolt head is smaller than a nut type tensioner, allowing torquebolts to fit tighter areas. They are also available for high temperature service and can be made from a variety of materials.

• Application Examples: High pressure feedwater heater, hydro plant nozzles on pelton turbines.

SB12 - Torquebolt™ Series
• Operating Temp: -150ºF to 500ºF*
(*additional material testing may be required for low temperatures)

• Description: SB12 Torquebolts™ offer higher strength and are more suitable for low temperatures. Other features are the same as SB8 Torquebolts™.

• Application Examples: Gear boxes, BOF applications, mining equipment, pinion stands, clamp type flange connections, and wind tunnels.

SBU - Ultrabolt Series

• Description: Ultrabolts are the strongest fasteners available, when applied correctly (usually with Flexnuts). Ultrabolts are custom designed, utilizing special and/or exotic materials. Bolt stress up to 120,000 psi is normal. Some Ultrabolts are capable of withstanding 300,000 psi tensile stress with 250,000 psi yield strength. Preloading repeatedly to 250,000 psi, with only the jackbolts, has been successfully accomplished without damage. For those applications requiring a nut with the Ultrabolt, SXU Flexnuts are recommended (grade 8 nuts are not strong enough for Ultrabolts). Contact Superbolt® for your high strength and extra high strength requirements.

SSJX - Torquebolt™ Series
• Operating Temp: -50ºF to 500ºF

• Description: SSJX Torquebolts offer Multi-Jackbolt features in the same countersink as large standard socket head cap screws. They feature Moly lubricated setscrews.

• Application Examples: Gear boxes, BOF applications, mining equipment, pinion stands, clamp type flange connections, wind tunnels, machine tools, presses.