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HYDRAULICS-FITTINGS, Q2758-PRELIMINARY CHECK OF ANTI GALL FINISHES
GENERAL DYNAMICS/FORT WORTH TEX
Pagination or Media Count:
Galling characteristics of Q2758 fittings were investigated in order to evaluate proposed surface finishes. Six Q2758-893-5 fittings were submitted as specimens. Two of these specimens were treated per Convair surface finish A, change 3, Q-2758 Standard, two were treated per Convair surface finish B, anodized, and two were as delivered. One specimen of each surface finish was mated with an Al tee, and one specimen of each surface finish was mated with a steel tee which had been stripped of Cd plating and plated with Ni. Only the threads and lip at the end of the fittings were plated. Each specimen was torqued up to specified values 19 times and the breakaway torque was noted as the fitting was removed each time. No excessive breakaway torques were recorded. The Al tees showed slight signs of wear, but no fitting or tee developed sufficient roughness to noticeably interfere with removal or installation. The plated lip on the steel tees showed some tendency to peel. All specimens and fittings were in usable condition at the completion of the test. Author
APPROVED FOR PUBLIC RELEASE