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Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
washer head hex standard english
http://www.accuratescrew.com/catalog/washer-head-hex-standard

Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
hex standard machine self-sealing washer english
http://www.accuratescrew.com/catalog/ssms-hex-head-sswo