THE SUPERBOLT TECHNOLOGY

Superbolt mechanical multi-jackbolt tensioners (MJTs) are an innovative way to tighten large bolts safely and accurately with the use of simple hand tools. Actual tensioning is achieved by tightening the jackbolts that encircle the nut body. Superbolt tensioners are designed as a direct replacement for conventional nuts and bolts. There is low risk of galling, even in space-restricted areas.

How does a mechanical tensioner work?

By tightening the jackbolts, a strong thrust (axial) force is generated and directed against a hardened washer
The loads are transferred through the nut body, which is positioned on the main thread by hand
A hardened washer is used to transfer the force while protecting the flange face
The thrust (axial) force of many jackbolts and the opposite reaction force of the main bolt head create a strong clamping force on the flange
The thrust (axial) force from the jackbolt creates an equally strong reaction force in the main bolt

Easier, safer, and faster than torquing large fasteners, using only hand tools

Perform safe installations in any environment, regardless of harshness, remoteness, or space restrictions

A single worker can torque the largest Superbolt assemblies without specialized skills or heavy equipment

Eliminate dangerous pinch points, heavy equipment lifts, or high system stress

EXPANSION SLEEVE COUPLING BOLTS

Superbolt expansion bolts are truly fitted into the hole due to the radial expansion of the conical bore sleeve.

By design, accurate radial force combined with the known axial clamping load, provides total protection against coupling slippage and thus prevents bolt and hole damage during subsequent removals.

The expansion bolts can be retrofitted to replace traditional interference or force fitted bolts, reliably and cost-effectively.

BOLTED INSIGHTS

Count on our knowledge in every step of your journey, across installation, maintenance, and after-market support.

Bolting Tips What happens to preload and clamp force when external loads are applied? We generally apply torque via a wrench to the bolt or nut to generate the required tightening load. This tightening load is called preload. Preload is defined as the tension created in a fastener w... Více informací

Bolting Tips The Experts: The making or breaking of bolted joints What is Hooke’s Law and why is it crucial to bolted joints? Hooke’s Law relates to the accurate tightening of bolted joints. When examining a bolt’s behaviour, the axial force is plotted against th... Více informací

Knowledge Coupling Challenges & the Evolution What are the challenges with couplings and how they evolved over the years. Bolting experts at Nord-Lock Group share useful insights into the application. Více informací

SIMPLE TOOLS, SUPER RESULTS

The ease of torquing with the accurate bolt elongation of tensioning - explore standard solutions

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Superbolt mechanical tensioners are accurate within 10% of preload.

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THE SUPERBOLT TECHNOLOGY

How does a mechanical tensioner work?

EXPANSION SLEEVE COUPLING BOLTS

BOLTED INSIGHTS

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