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General Mechanical Properties for bolts

Property 4.8 5.8 6.8 8.8 10.9 12.9
<= 16mm > 16mm
Tensile Strength
Rm in MPa (N/mm2) minimum 420 520 600 800 830 1040 1220
Brinell Hardness minimum 124 152 181 219 242 295 353
HB F=30D2 maximum 209 238 285 319 363 412
Rockwell Hardness HR minimum HRB 71 82 89
minimum HRC 20 23 31 38
maximum HRB 95 95
maximum HRC 30 34 39 44
Surface Hardness maximum 320 356 402 454
HV 0.3
Yield Stress nominal value 320 400 480
Rel in MPa(N/mm2) minimum 340 420 480
0.2% elongation limit nominal value 640 640 900 1080
Rp0.2 in Mpa (N/mm2) minimum 640 660 940 1100
Test stress Sp Sp/Rel or Rp0.2 0.91 0.91 0.91 0.91 0.91 0.88 0.88
MPA (N/mm2) 310 380 440 580 600 830 970
Elongation after fracture minimum 14 10 8 12 12 9 8
A5 in %
Minimum notch impact energy in Joules 30 30 20 15
Maximum Height of the Thread Zone Not Decarburized E 1/2H1 1/2H1 2/3H1 3/4H1
Maximum Depth of Decarburization Gmm 0.015 0.015 0.015 0.015

Proof Loads For Nuts
According to DIN 934 and DIN 985
(Ref. DIN 267/4)

Thread Pitch Nominal Stress Area of Test Mandrel As mm2 Property Class
Size P(mm) 4 5 6 8 10 12
Proof Load (As * Sp), in N
M3  0.50 5.03 2500 3000 4000 5000 6000
M3.5  0.60 6.78 3400 4050 5400 6800 8150
M4  0.70 8.78 4400 5250 7000 8750 10500
M5  0.80 14.2 7100 8500 11400 11400 17000
M6  1.00 20.1 10000 12000 16000 20000 24000
M7  1.00 28.9 14500 17300 23000 29000 34700
M8  1.25 36.6 18300 22000 29000 36500 43000
M10  1.50 58 29000 35000 46000 58000 69500
M12 1.75 84.5 42100 50500 67000 84000 100000
M14  2.00 115 57500 69000 92000 115000 138000
M16  2.00 157 78500 94000 126000 157000 188000
M18  2.50 192 76800 96000 115000 154000 192000 230000
M20  2.50 245 98000 122000 147000 196000 245000 294000
M22  2.50 303 121000 151000 182000 242000 303000 364000
M24  3.00 353 141000 176000 212000 282000 353000 423000
M27  3.00 459 184000 230000 276000 367000 459000 550000
M30  3.50 561 224000 280000 336000 448000 561000 673000
M33  3.50 694 277000 347000 416000 555000 694000 833000
M36  4.00 817 327000 408000 490000 653000 817000 980000
M39  4.00 976 390000 488000 585000 780000 976000 1170000

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