Torque & tensile data - non-ferrous fasteners

 

 

Non ferrous materials according to ISO 8839

DIN No Material Nominal thread diameter d Tensile strength Rm min. N/mm2 Stress at permanent set limit Rp 0.2 min. N/mm2 Elongation after fracture A min. (%)
Symbol Abbrev. Designation (former)
2.0321 CU2 CuZn37 Brass (Ms 63) d = M6 440 340 11
M6< d = M39 370 250 19
2.0401 CU3 CuZn39Pb3 Brass (Ms 58) d = M6 440 340 11
M6< d = M39 370 250 19
2.102 CU4 CuSn6 Resistin d = M12 470 340 22
M12< d = M39 400 200 33
2.0853 CU5 CuNiSi Kuprodur d = M39 590 540 12
2.3535 AL1 AIMg3   d = M10 270 230 3
250 180 4
M10< d = M39
3.2315 AL3 AISi1MgMn   d = M6 320 250 7
M6< d = M39 310 260 10
 

 

Minimum breaking loads according to ISO 8839

Thread Thread pitch P (mm) Nominal stress area as mm2 Symbols for materials
CU2 CU3 CU4 CU5 AL1 AL3
Min. breaking loads (for nuts: proof load ** As x Rm  (N)
M3 0.5 5.03 2210 2210 2360 2970 1360 1610
M3.5 0.6 6.78 2980 2980 3190 4000 1830 2170
M4 0.7 8.78 3860 3860 4130 5180 2370 2810
M5 0.8 14.2 6250 6250 6670 8380 3830 4540
M6 1 20.1 8840 8840 9450 11860 5430 6430
M7 1 28.9 10690 10690 13580 17050 7800 8960
M8 1.25 36.6 13540 13540 17200 21500 9880 11350
M10 1.5 58 21460 21460 27260 34220 15660 17980
M12 1.75 84.3 31190 31190 39620 49740 21080 26130
M14 2 115 42550 42550 46000 67850 28750 35650
M16 2 157 58000 58000 62800 92630 39250 48670
M18 2.5 192 71040 71040 76800 113300 48000 59520
M20 2.5 245 90650 90650 98000 144500 61250 75950
 

** The tensile test for whole full size bolts according to ISO 898 - 1 must be carried out.

 

 

Min. fracture torque for screws up to M5 according to ISO 8839

Thread d Symbols for materials
CU2 CU3 CU4 CU5 AL1 AL3
Min. breaking torque ** (Nm)
M1.6 0.1 0.1 0.11 0.14 0.06 0.08
M2 0.21 0.21 0.23 0.28 0.13 0.16
M2.5 0.45 0.45 0.5 0.6 0.27 0.3
M3 0.8 0.8 0.9 1.1 0.5 0.6
M3.5 1.3 1.3 1.4 1.7 0.8 0.9
M4 1.9 1.9 2 2.5 1.1 1.4
M5 3.8 3.8 4.1 5.1 2.4 2.8