On diameters over 1 inch to 1 1/2 hardness will range from HRC 19-30

1/4-20 Drop-In Anchor Zinc Plated (100)

Coarse threads run approximately 2/3 up the shank to draw the decking tightly to the substrate

3/4 x 7 Hex Lag Screw Zinc Plated

5/8-11 x 3 3/4 Hex Cap Screw SS 18-8 (A2)

25/64 x 12 High Speed Aircraft Bit Cobalt (3) 1-14 Socket Cap Screws Alloy On diameters over 1 inch25 64 x 12 High Speed Aircraft Bit Cobalt . Manufactured to NAS 907 Type J specifications Heavy duty construction for portable or machine drilling For use in drilling in high tensile strength alloy steels, stainless steels, titanium and other difficult to machine materials Made in the USA