Superbolt® Flexnuts

Enhance bolt or stud longevity by alleviating stress concentrations with Superbolt Flexnuts, increasing fatigue life and ensuring long-term reliability.

REACTIVE SIDE SOLUTIONS

Superbolt developed the Flexnut for through-hole applications. Flexnuts bring the advantages of MJT-type elasticity to the reactive side of the joint.

Flexnuts are designed to flex out at the bottom and flex in toward the top of the nut. This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads.

Flexnuts are reactive nuts, designed to be applied opposite Superbolt tensioners. They are never torqued directly to achieve preload.

Additional information

Advantages

Specifications

Flexnut type	Specifications
SX8 Standard Flexnut	Dimension range: M20 - M160 (3/4″ - 6″) Approx. bolt stress depending on size: 450 to 700 N/mm2 (60 to 100 ksi) Temperature range: -10 to 250ºC (0 to 500ºF)
SX12 High-strength Flexnut	Dimension range: M20 - M160 (3/4″ - 6″) Approx. bolt stress depending on size: 500 to 900 N/mm2 (70 to 130 ksi) Temperature range: -10 to 250ºC (0 to 500ºF)

Technical drawings

Download

View

Superbolt Tensioners Dimension Sheet - SX12 Metric.pdf
Superbolt Tensioners Dimension Sheet - SX12 UNC.pdf
Superbolt Tensioners Dimension Sheet - SX8 Metric.pdf
Superbolt Tensioners Dimension Sheet - SX8 UNC.pdf
Tensioning application checklist.pdf

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