Hardness is Rockwell C32 maximum and proof load is 72

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1/2-20 x 5 1/2 Hex Cap Screw SS 18-8 (A2)

1-14 x 6 Socket Cap Screw Alloy

3/4-16 x 4 1/2 Hex Cap Screw SS 316 (A4)

8 x 1 1/4 Phillips Wafer Self Drilling Cement Board Screws w/ Nibs Ruspert Coated - Carton (5000) 1 3/8-12 Socket Cap Screws Alloy Hardness is Rockwell C32 maximum8 x 1 1 4 Phillips Wafer Self Drilling Cement Board Screws w Nibs Ruspert Coated Carton (5000) . Meets F. I. P. 1000. 7 for torsional strength and drill speed Ceramic coating provides protection from corrosion Designed to work with all backer boards Nibs under head clamp board firmly