Screws with a diameter over 1 ½ inches have a hardness rating of HRB 95 - HRC 35

The third generation of this patented wall anchor comes with these improvements:

5/8-11 x 2 Flat Socket Cap Screw 18-8 (A2) Stainless Steel

3/4-10 x 2 Socket Set Screw Cup Point Alloy

7/8-9 x 1 1/2 Hex Cap Screw SS 18-8 (A2)

M30-3.50 x 120 Socket Cap Screw 12.9 Alloy Plain DIN 912 1-8 Socket Cap Screws Alloy Screws with a diameter overM30 3. 50 x 120 Socket Cap Screw 12. 9 Alloy Plain DIN 912 . Alloy Socket Head Cap Screws from Brighton Best. Hardness of RC 38 43, meets or exceeds DIN 912. Manufactured from heat treated alloy steel, 1960 series.