High Tensile Fastener Materials

Identification

Grade 8.8 bolts are identified through a horizontally forged 8.8 in one corner, grade 8 nuts are identified by an indented line in the 8 o'clock position with a dot to signify the 12 o'clock position.

Physical Properties of High Tensile Steel Bolts

Grade

Minimum Ultimate

Tensile Stress (N/mm2)

Stress Under Proof

Load (N/mm2)

Recommended Grade of Nut
8.8 785 571 8
10.9 981 777 12
12.9 1177 932 12

Torque Data for High Tensile Steel Bolts

Diameter


Tensile

Stress

Area (mm2)

Proof Load(kN)



Approximate Torque (Nm)


Grade 8.8 Grade 10.9 Grade 12.9 Grade 8.8 Grade 10.9 Grade 12.9
M12 84.3 48.1 65.5 78.6 98 134 160
M16 157 89.6 122 146 244 331 397
M20 245 140 190 228 476 646 775
M22 303 173 235 282 647 879 1054
M24 353 201 274 329 822 1120 1342
M27 459 262 356 428 1202 1634 1964
M30 561 320 435 523 1632 2218 2667
M33 694 396 539 647 2221 3024 3630
M36 817 466 635 761 2852 3886 4657

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