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Six ASTM A-574 steel cap screws from a hydraulic coupling failed after 3 months in service. The screws were replacements for smaller-diameter cap screws that had been installed during an outage. Six new cap screws were examined along with the failed screws. Eight fracture locations were identified—three at the head-to-shank fillet, four at the eighth thread root from the cap, and one at the sixth thread root from the cap. Fracture surfaces were examined using a stereomicroscope and SEM, and the fracture mode was shown to be transgranular. EDS on the fracture surfaces showed sulfur and chlorine in the...

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