Hex Bolts - Fastener Mart
It is advisable to match materials and finishes of bolts, washers and nuts. If, say, you are using a zinc plated hex bolt, use a zinc plated washer and zinc plated nut. Likewise for stainless steel: use a stainless steel bolt along with a stainless steel washer and nut. Stainless steel hex bolts are susceptible to thread galling and seizing.
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