The Model 640.20B Fracture Mechanics Grips are manufactured per ASTM E-399 specifications. They are the most popular grips used for fracture toughness and fatigue crack growth rate tests. They are constructed from high-strength, aircraft-quality 4340 steel and are machined to the exacting tolerances required by ASTM. The package includes two grips, two .4W pins, and four spring retainers. 

Model 640 Fracture Mechanics Clevis Grips

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