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Unbrako High-tensile Fasteners

Established in 1911, Unbrako is the ultimate authority in high tensile industrial fasteners and remains the socket screw by which all others are measured .

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NABL Certified Lab

The NABL ISO/IEC 17025 certified lab facilitates in maintaining consistent high quality. Strict quality checks are done at every stage to meet the needs of most demanding industries.

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Specialized Coatings

A variety of coatings are done in-house: Hot Dip Galvanizing, Mechanical Galvanizing, Zinc / Zinc- Nickel Electroplating, PTFE, Geomet® , Delta Dorken® and Unbrako Wiscoat, among others.

Advantages built into every detail

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Higher Tensile Strength

Unbrako tensile specifications are 10,000 psi higher than industry standard - while maintaining the core hardness range.

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E-CODETM Head Marking

The ultimate in fastener traceability - from its original manufacturing lot, raw material chemistry to performance test results.

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Compound Fillet Radius

This design change alone is responsible for doubling fatigue life at critical head-shank juncture.

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Radiused Root Runout (3R)

Provides a smooth form that distributes stress and increases fatigue life of thread run-out as much as 300% in certain sizes.

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Wide Root Thread Form

An Unbrako development that doubles the fatigue life compared to flat root thread forms.

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Etching for Thread Laps

The only method to detect thread laps is that random samples of rolled threads are etched in heated acid, and then examined under a stereo microscope.

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Forged Heads

The flow lines of the material are continuous, resulting in increased strength, better installation ability, and a longer product life.

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Rolled Threads

Roll threading compresses the material’s grain flow and enhances fatigue resistance.

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