Categories

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
8.87855718
10.998177712
12.9117793212

Torque Data for High Tensile Steel Bolts

Diameter


Tensile

Stress

Area (mm2)

Proof Load(kN)



Approximate Torque (Nm)


Grade 8.8Grade 10.9Grade 12.9Grade 8.8Grade 10.9Grade 12.9
M1284.348.165.578.698134160
M1615789.6122146244331397
M20245140190228476646775
M223031732352826478791054
M2435320127432982211201342
M27459262356428120216341964
M30561320435523163222182667
M33694396539647222130243630
M36817466635761285238864657