Quality Assurance

Big Bolt's quality assurance department performs dimensional and physical testing in-house, from tensile and hardness testing to a full level III PPAP.

Utilizing a staff of 15 full time quality employees and 2 level II certified NDT inspectors, Big Bolt is equipped to meet your requirements.

Two computer controlled tensile testing machines allow Big Bolt to test fasteners full size from #10 (M4) up to a 1 1/2" (M36) in diameter and 55" (1400mm) long. Larger sizes can be tested

Four automatic Rockwell hardness testers have the capability to check core and surface hardness.

Calibrated thread ring gauges in inch and metric from 1/4" (M6) - 4" (M72)

All gage setting plugs are calibrated in-house. Ensuring that Big Bolt has the calibrated gages your job requires.

Comparators are used to measure the under head fillet radius as well as the thread root radius when applicable.

Automated mounting press along with the grinder / polisher for inspection of thread laps and decarburization.

ISO 9001:2015 Certificate

ITAR Registered

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