Ручные и измерительные инструменты Hoffmann Group 2026 - страница 1232

GBP 57 Clamping forces and torques For metric screws. Indicative coefficient of friction of thread μ (minimum values). Screw thread Steel Coefficient of Clamping force Under head Fsp (N) Clamping torque Msp (cNm) blackened or friction of Threads coefficient of Zn phosphated thread μ 6.9 8.8 10.9 12.9 friction μK 6.9 8.8 10.9 12.9 0.10 475 565 795 955 0.10 12.5 14.5 21 25 0.14 440 520 730 875 BM 1.6 0.14 15 18 25 30 galvanized pressed ground ground turned 0.16 420 495 700 840 0.16 16 19 27 32 rolled Nut thread cut 6μ 6μ 0.10 560 665 935 1120 0.10 15.5 18.5 26 31 rolled 0.14 0.10 0.16 0.10 0.10 0.14 520 610 860 1030 M 1.7 0.14 19 22 31 38 0.16 495 585 825 990 0.16 20 24 34 40 ground 0.16 0.10 0.16 0.10 0.10 0.10 790 940 1320 1590 0.10 26 30 43 51 0.14 730 865 1210 1460 M2 0.14 31 37 52 62 rolled Zn phosphate 0.14 0.10 0.16 700 825 1160 1400 0.16 34 40 56 67 ground slightly oiled 0.10 1140 1350 1900 2280 0.10 41 49 69 83 turned 0.10 0.14 1050 1250 1750 2100 M 2.3 0.14 51 60 84 101 ground 0.16 1010 1190 1680 2020 0.16 54 65 91 109 turned Steel 0.10 0.10 0.10 0.10 0.10 1320 1570 2210 2650 0.10 52 62 88 105 ground 0.14 1220 1450 2030 2440 M 2.5 0.14 64 76 107 128 cadmium plated 0.14 0.16 1170 1380 1950 2340 0.16 69 82 115 138 galvanised 0.10 0.10 1460 1730 2440 2930 0.10 59 70 99 119 0.14 1350 1600 2250 2700 M 2.6 0.14 73 86 121 145 6μ cadmium plated 0.10 0.10 0.14 0.16 1290 1530 2150 2580 0.16 78 93 130 156 0.10 2020 2390 3370 4040 0.10 92 109 154 185 dry galvanised 0.10 0.10 0.14 0.14 1860 2210 3110 3730 M3 0.14 113 134 189 225 0.16 1790 2120 2980 3580 0.16 122 145 205 242 Indicative coefficient of friction under head μ 0.10 2710 3210 4520 5420 0.10 142 168 235 285 (minimum values). 0.14 2500 2960 4170 5000 M 3.5 0.14 173 205 290 345 Screw head or Steel 0.16 2400 2840 4000 4790 0.16 187 220 310 375 nut blackened or 0.10 3500 4150 5830 7000 0.10 210 250 350 425 Zn phosphated 0.14 3230 3830 5380 6460 M4 0.14 260 305 430 515 cadmium plated 0.16 3100 3670 5160 6160 0.16 280 330 465 555 galvanized extruded 0.10 5720 6780 9540 11450 0.10 415 490 690 830 ground turned Workpiece surface 0.14 5280 6260 8810 10550 M5 0.14 510 605 850 1020 6μ 6μ planed 0.16 5070 6010 8450 10150 0.16 550 650 915 1100 milled 0.10 0.10 0.10 0.10 Clamping torques turned Msp (Nm) planed 0.10 8080 9570 13450 16150 0.10 7.1 8.5 12 14.5 milled 0.10 Zn phosphate turned 0.14 7450 8830 12400 14900 M6 0.14 8.7 10.5 14.5 17.5 slightly oiled 0.16 7150 8470 11900 14300 0.16 9.4 11 15.5 19 ground 0.14 0.10 0.10 11800 14000 19650 23600 0.10 11.5 14 19.5 23 0.14 10900 12950 18200 21800 M7 0.14 14.5 17 24 29 Steel ground 0.16 0.10 0.16 0.10 0.10 0.16 10450 12400 17450 20900 0.16 15.5 18.5 26 31 0.10 14800 17550 24700 29600 0.10 17 20 29 34 cadmium plated 0.10 0.10 0.10 0.14 0.14 13700 16200 22800 27400 M8 0.14 21 25 35 42 galvanised 0.10 0.10 0.10 0.16 0.16 13150 15550 21900 26300 0.16 23 27 38 46 6μ 0.10 23600 27900 39300 47200 0.10 34 41 57 69 cadmium plated 0.10 0.10 0.16 0.14 21800 25800 36300 43600 M 10 0.14 42 50 71 85 dry 0.16 20900 24800 34900 41800 0.16 46 54 76 92 galvanised 0.10 0.10 0.10 34400 40700 57300 68700 0.10 59 70 99 119 planed 0.14 31800 37700 53000 63500 M 12 0.14 73 87 122 147 slightly oiled milled 0.10 0.10 0.10 0.10 GG turned 0.16 30500 36100 50800 61000 0.16 79 94 132 159 0.10 47200 55900 78600 94300 0.10 94 112 157 189 GTS ground 0.16 0.10 0.16 0.10 0.10 0.14 43600 51700 72700 87300 M 14 0.14 117 138 195 235 0.16 41900 49600 69800 83800 0.16 126 150 210 250 Clamping forces and clamping torques 0.10 64800 76800 108000 129500 0.10 144 170 240 285 Clamping forces Fsp and clamping torques Msp for screws 0.14 60100 71200 100000 120000 M 16 0.14 179 210 300 360 with metric coarse pitch threads to DIN 13 , and head 0.16 57700 68400 96100 115500 0.16 194 230 325 385 contact dimensions to DIN 6912, DIN 7984, DIN 7990, 0.10 78900 93500 131500 157500 0.10 199 235 330 395 DIN EN ISO 4762, DIN EN ISO 4014, DIN EN ISO 24032. 0.14 73000 86500 121500 146000 M 18 0.14 245 290 410 490 The table values Fsp and Msp are based on the SI unit N 0.16 70100 83000 117000 140000 0.16 265 315 445 530 (Newton). 0.10 101500 120000 169000 202500 0.10 280 330 465 560 0.14 93900 111000 156500 187500 M 20 0.14 350 410 580 695 1 N = 0.102 kP, 1 Ncm = 0.102 kPcm, 0.16 90100 107000 150000 180500 0.16 375 445 625 755 1 Nm = 0.102 kPm, 1 kp = 9.81 N, 0.10 126500 150000 211000 253000 0.10 375 445 625 755 1 kPcm = 9.81 cNm, 1 kPm = 9.81 Nm. 0.14 117500 139000 195500 235000 M 22 0.14 470 555 785 940 The clamping forces Fsp shown in the left-hand table 0.16 112500 133500 188000 225000 0.16 510 605 850 1020 generate a screw extension 90% of the elastic limit σ0.2 0.10 146000 173000 243000 292000 0.10 480 570 800 965 0.14 135000 160000 225000 270000 M 24 0.14 560 710 1000 1200 (DIN 267 sheet. 3) by means of the comparative tension 0.16 130000 154000 216000 260000 0.16 650 770 1080 1300 σred1 in conjunction with the relevant thread friction factor µ. 0.10 192000 227000 320000 384000 0.10 710 840 1180 1420 The clamping force table shows which screw size and tensile 0.14 178000 211000 297000 356000 M 27 0.14 890 1050 1480 1780 grade is required to achieve the specified assembly force FM 0.16 171000 203000 285000 342000 0.16 965 1140 1610 1930 (Fsp ≥ FM). 0.10 233000 276000 385000 466000 0.10 965 1140 1610 1930 The clamping torques Msp are calculated from the clamping 0.14 216000 256000 361000 433000 M 30 0.14 1200 1430 2010 2410 forces Fsp, assuming μ = μK = μtot1 . 0.16 208000 246000 346000 416000 0.16 1310 1550 2180 2610 The clamping torque Msp required to achieve 90% of the 0.10 291000 34400 484000 581000 0.10 1300 1540 2170 2600 elastic limit of a screw of given dimensions and grade is 0.14 270000 320000 450000 539000 M 33 0.14 1630 1940 2720 3270 found in the right-hand table, depending on the under-head 0.16 259000 307000 432000 518000 0.16 1770 2100 2950 3540 coefficient of friction (μK), which is taken to be the same as 0.10 341000 404000 568000 682000 0.10 1680 1990 2790 3350 0.14 216000 375000 527000 633000 M 36 0.14 2100 2490 3500 4200 the thread coefficient of friction. 0.16 304000 360000 507000 608000 0.16 2300 2700 3790 4550 The nominal torque used in practice should be the clamping 0.10 410000 485000 663000 819000 0.10 2170 2570 3610 4330 torque Msp value shown in the table less half the spread of 0.14 380000 451000 634000 761000 M 39 0.14 2720 3220 4540 5440 the intended torque wrench. 0.16 366000 433000 610000 731000 0.16 2960 3500 4930 5910 i Calculation of table values and instructions for use according to VDI 2230. 1232