UNC A2 Stainless Steel Hexagen Plain Full Hex Nuts Coarse Thread. UNC Coarse thread plain hex nuts. A2 stainless steel for increased corrotion resistance. 4-40 1/4" 1/32" 40. 5/16" 1/2" 9/32" 18. 1/2" 3/4" 7/16" 13.
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