Superbolt Multi-jackbolt tensioners (MJT) standard range

Superbolt split-nut thrust collars on forging press.

A revolution in the design & tightening of bolted joints Superbolt multi-jackbolt tensioners (MJTs) from Nord-Lock offer an innovative technology for tightening bolts & studs. Superbolt products have been proven and established as a preferred solution for bolting in every major industry, all over the world. Our multi-jackbolt tensioners offer you simple and cost effective tightening, even for large size bolts. Your joints can be tightened with high accuracy without requiring specialist skills or heavy tooling. MJTs ensure a profitable life cycle cost by improving the bolt design for OEM manufacturers,...

The innovative bolting solution What is Superbolt? Superbolt tensioners are designed as direct replacements for conventional nuts and bolts. These devices can be threaded onto a new or existing bolt, stud, threaded rod or shaft. The main thread serves to position the tensioner on the bolt or stud against the hardened washer and the load bearing surface. Once it is positioned, actual tensioning of the bolt or stud is accomplished with simple hand tools by torquing the jackbolts which encircle the main thread. The jackbolts transfer the preload evenly into the main thread and, consequently, onto...

Proven and certified Over the years, the product types in our wide range of multi-jackbolt tensioners have been tested and approved by several certification institutes. For some of our product series we have also achieved design and type approvals for production. Below are some examples: • DNV (Det Norske Veritas) • GL (Germanischer Lloyd) • Siemens system audit Proven in the field Superbolt tensioners are used in many industries: Hydropower, wind turbines, gas and steam turbines, nuclear, steel, mining, shipbuilding, offshore, chemical, transportation, to name a few. The high level of experience...

Advantages from start to finish Design First installation Our engineers can help you determine dimensions and load conditions of your bolted joints. We can evaluate your current tightening method and calculate bolt preloads necessary for reliability and durability. OEMs all over the world specify our multi-jackbolt tensioners in their design to improve the performance of their product. The huge mechanical advantage of Superbolt products means only simple hand tools are required to tighten any size bolt or stud. Let’s take a closer look at the advantages your workers will realize during installation....

The ability to maintain necessary preload is crucial for keeping machinery running. Using multi-jackbolt technology allows proper preloading of the bolted joint in operation. Routine equipment maintenance requires removal and re-installation of Superbolt tensioners. Using and maintaining multi-jackbolt tensioners is safe and easy. • Accuracy - Accurate and even tension across bolted joints reduces the tendency for leakages or uneven loading of adjacent fasteners. • Easy to check - Due to the low torques required, it is easy to inspect that the joint is tight with simple torque tests using hand...

The solution to bolting problems Selection Guide Product line Nut-style tensioners Main characteristics High strength Medium temperatures Medium temperatures, tall Dimensional range - Metric - Imperial Approximate bolt stress depending on size Temperature range Based on stress area As Based on stress area As Lower temperatures on demand Surface treatment Application samples Bolting applications in demanding industries. Similar to MT, but for higher strength. Large studs on: - Boiler feed pumps - Boiler circulating pumps - Reactors - Heat exchangers Etc. Split lines on: - Turbines - Engines -...

Bolt-style tensioners High strength High strength Lower temperatures on demand Lower temperatures on demand Limited height: - Hydraulic cylinders - Shaft mounts - Piston connections - Foundations Etc. Bolting applications in demanding industries. Similar to SB8, but for higher strength. Reactive nut for through hole applications. Adds elasticity to bolted joints. Highly recommended for short clamp lengths. Similar to SX8, but for higher strength. Equivalent nut-style tensioner: MT Equivalent nut-style tensioner: CY In combination with MT nut-style tensioners or SB8 bolt-style tensioners In combination...

World class manufacturing The Nord-Lock Group has invested heavily in the Superbolt manufacturing facilities in world class CNC machining operations. Our capacity for machining allows quick turnaround of standard and special multi-jackbolt tensioners and other related bolting products. Quality and traceability Special attention has been paid over the years to developing and implementing our quality systems to work on highly critical and demanding industries. Quality control, including thread gauging and measurement systems, is standard operating procedure. Multi-jackbolt tensioner nut and bolt...

Overview of part names On every part delivered you can always ensure that you have received the right product, including the following information. Marking system on our products is explained in the below tables. Standard, Metric Type/series MT Nut-style tensioner, standard CY Nut-style tensioner, high strength SJ Nut-style tensioner, compact H650 Nut-style tensioner, medium temperature H650T Nut-style tensioner, medium temperature, tall, slim O.D. SX8 Flexnut, standard SX12 Flexnut, high strength SB8 SB12 Bolt-style tensioner, standard Bolt-style tensioner, high strength Standard thread profile...

Superbolt nut-style tensioner, standard Preload total - Maximum values valid for permanent bolting applications, including reaction forces. - Other sizes, thread pitches or threads per inch (TPI) may be available. Please contact your local Nord-Lock office. - Dimensions listed are representative. Typical manufacturing tolerances apply (approximately within 1mm or 1%). Preload total Components: 1 Nut body 2 Jackbolts 3 Hardened washer