304 and 305 series stainless steels so 18-8 is used at times to designate any and all of those alloy groups

5/8-18 x 3 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25)

1 1/2-6 x 5 1/2 A307A Hex Bolt Plain Steel

5/8-11 x 1 1/4 Grade 5 Hex Cap Screw Plain Domestic USA (225)

1 1/8-7 x 2 1/2 Socket Set Screw Cup Point Alloy

8-18 x 1-1/2 Hex Washer Head Self Drilling Screw Zinc Plated Tek #2 (5000) 2-4 1/2 Socket Cap Screws Alloy 304 and 305 series stainless8 18 x 1 1 2 Hex Washer Head Self Drilling Screw Zinc Plated Tek #2 (5000). A tapping screw with an integrally formed hex washer head , spaced or unified threads, and a #2 or #3 drill point. Designed to drill through steel. AISI 1022 or equivalent steel. Rockwell C50 56. Meets F. I. P. 1000. 7 for torsional strength & drill speed. Meets ASTM A 510 for carbon steel manufacturing. Zinc plating meets ASTM B 117 for salt spray corrosion. Manufactured to