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Olander (english metric)
olander-Hex Washer Head Standard Screws
hex washer head standard screws english metric
https://www.olander.com/products/machine-screws/?cid=hex-washer-head-standard-screws

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