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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
