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18 Inch fasteners Marking Product specification Grade 2 Grade 5 Grade 8 Cylinder head screw Alloy Flat head Slotted round head Nominal size range ¼ – ¾ >¾ – 1 ½ ¼ – 1 >1 – 1 ½ ¼ – 1 ½ <½ > ½ – 2 #0 – 1 #0 – 1 Material Low med carbon steel Medium carb steel heat treated Medium carb steel heat treated Alloy steel heat treated Alloy steel heat treated Alloy steel heat treated Tensile strength Minimum [psi] 74 000 60 000 120 000 105 000 150 000 180 000 170 000 145 000 145 000 Yield point Minimum [psi] 57 000 36 000 92 000 81 000 130 000 162 000 153 000 128 000 128 000 Proof load [psi] 55 000 33 000 85 000 74 000 120 000 140 000 135 000 – – Hard - ness Min 70 HRB 25 HRC 33 HRC 39 HRC 39 HRC 39 HRC Max 100 HRB 34 HRC 39 HRC 44 HRC 44 HRC 44 HRC suitable nuts Constrution steel Grade 2 Grade 5 Grade 8 – – – Standard mechanical properties SAE J429 ASTM A574 ASTM F835 ASTM F835 For comparison 145 PSI 1 MPA Mechanical properties – Steel Screws