SKF
Bolts and Tightening Systems
SKF bolts and tightening systems provide controlled, high-precision bolt tensioning and torque solutions for critical flange joints, machine foundations, and structural connections in heavy industry, marine, and wind energy. The range includes hydraulic bolt tensioners (for simultaneous, uniform bolt elongation), hydraulic torque wrenches, and the SKF Quickgrip bolting system for hydraulic nuts. These tools and bolts ensure that bolted joints achieve the exact preload specified by the designer, eliminating the uncertainty of torque-and-angle methods caused by friction scatter. Correct bolt preload prevents flange leaks, baseplate shifting, and fatigue failures on mill stands, turbine casings, propeller shaft flanges, and wind turbine tower connections. SKF also supplies SKF Superbolt multi-jackbolt tensioners, which replace a single large bolt with multiple smaller jackbolts that can be tightened with a simple hand tool, drastically reducing the time and equipment needed for large bolting operations.
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Trusted by Industry Leaders
Precise Preload Control
Hydraulic tensioning achieves ±2% accuracy on bolted joint clamping force.
Simultaneous Tensioning
Multiple bolt tensioners linked to one pump for uniform flange compression.
Reduced Bolting Time
SKF Superbolt reduces day-long tensioning to minutes with hand tools.
Eliminates Galling
Smooth, controlled elongation avoids thread seizure during tightening.
Leak-Free Flanges
Correct gasket seating prevents fugitive emissions and oil/water leaks.
Safety and Accessibility
Eliminate heavy sledging and hazardous torque multiplication equipment.
SKF Superbolt Multi-Jackbolt Tensioners
A Superbolt replaces a conventional large hex nut with a body containing multiple small jackbolts. Each jackbolt is tightened to a modest torque with a hand torque wrench, but combined they generate the immense preload of the single large bolt. This system enables safe, fast bolting of steam turbine casings, forge press columns, and ship engines without large, heavy hydraulic tooling — a game-changer for plant maintenance and confined-space operations.
Hydraulic Tensioning for Wind Turbine Foundation Bolts
Wind turbine tower and foundation anchor bolts require precise preload to ensure structural integrity under dynamic wind loads. SKF hydraulic tensioners, powered by a common pump, simultaneously tension all bolts on a flange circumference, achieving uniform load and eliminating the scatter associated with sequential torque tightening. The system includes documentation for quality assurance and lifetime structural integrity records.