Recommended for permanent dry

1/4-28 x 2 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (900)

5/16-18 x 4 1/2 Hex Tap Bolt Silicon Bronze

#40 x 6 High Speed Aircraft Bit Cobalt

5/16-24 x 3 Grade 8 Hex Cap Screw Plain Domestic USA (100)

8-18 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #2 (8000) 1 1/4-7 Socket Cap Screws Alloy Recommended for permanent dry8 18 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #2 (8000). 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 SAE