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BS SP 18+AND 19:2025 AEROSPACE SERIES. Washers, plain. BA, BSF and BSW threaded parts. Carbon (cadmium-plated) or corrosion-resisting steel. Specification
standard byBSI Group , 10/29/2025
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This British Standard specifies the materials, dimensions and protective finish of carbon (cadmium-plated) steel and corrosion-resisting steel washers, generally used with timber on aircraft. The washers are primarily for use with BA, BSF and BSW threaded fasteners.