
Testing
Tensile test
Torsion test
The purpose of the torsion test is to determine the breaking torque MB for bolts that can not be tested in tension.
Application
This procedure applies to bolts with the following technical specifications:
- Screws with head stronger than the threaded part
- Diameter of the threadless shank: dShank ≥ dThread
- Thread length: b ≥ 1 x d + 2 x P
- Thread: 1.6 mm ≤ d ≤ 10 mm
- Strength classes: 4.6 to 12.9
Test method
The screw must be clamped in a test fixture over a thread length of at least 1 x d with a free thread length of at least 2 x P from the head to the thread run-out or from the thread-free shank to the thread run-out. The torque is applied continuously in an ascending manner.
In the event of a complaint, the following procedure generally applies:
- Bolts that cannot be tested for tension ==> hardness value decisive for acceptance
- For bolts that can be tested for tension ==> tensile strength decisive for acceptance
Sources:
DIN ISO 898-7 - Mechanical properties of fasteners; Part 7: Torsion test and minimum breaking torques for bolts M1 to M10
Vickers hardness test (HV)
Hardness test according to Brinell (HB)
Hardness test according to Rockwell (HRC)
Hardness comparison table
Tensile strength | Vickers hardness | Brinell hardness | Rockwell hardness |
---|---|---|---|
MPa | HV10 | HB | HRC |
255 | 80 | 76,0 | - |
270 | 85 | 80,7 | - |
285 | 90 | 85,5 | - |
305 | 95 | 90,2 | - |
320 | 100 | 95,0 | - |
335 | 105 | 99,8 | - |
350 | 110 | 105 | - |
370 | 115 | 109 | - |
385 | 120 | 114 | - |
400 | 125 | 119 | - |
415 | 130 | 124 | - |
430 | 135 | 128 | - |
450 | 140 | 133 | - |
465 | 145 | 138 | - |
480 | 150 | 143 | - |
495 | 155 | 147 | - |
510 | 160 | 152 | - |
530 | 165 | 156 | - |
545 | 170 | 162 | - |
560 | 175 | 166 | - |
575 | 180 | 171 | - |
595 | 185 | 176 | - |
610 | 190 | 181 | - |
625 | 195 | 185 | - |
640 | 200 | 190 | - |
660 | 205 | 195 | - |
675 | 210 | 199 | - |
690 | 215 | 204 | - |
705 | 220 | 209 | - |
720 | 225 | 214 | - |
740 | 230 | 219 | - |
755 | 235 | 223 | - |
770 | 240 | 228 | 20,3 |
785 | 245 | 233 | 21,3 |
800 | 250 | 238 | 22,2 |
820 | 255 | 242 | 23,1 |
835 | 260 | 247 | 24,0 |
850 | 265 | 252 | 24,8 |
865 | 270 | 257 | 25,6 |
880 | 275 | 261 | 26,4 |
900 | 280 | 266 | 27,1 |
915 | 285 | 271 | 27,8 |
930 | 290 | 276 | 28,5 |
950 | 295 | 280 | 29,2 |
965 | 300 | 285 | 29,8 |
995 | 310 | 295 | 31,0 |
1030 | 320 | 304 | 32,2 |
1060 | 330 | 314 | 33,3 |
1095 | 340 | 323 | 34,4 |
1125 | 350 | 333 | 35,5 |
1155 | 360 | 342 | 36,6 |
1190 | 370 | 352 | 37,7 |
1220 | 380 | 361 | 38,8 |
1255 | 390 | 371 | 39,8 |
1290 | 400 | 380 | 40,8 |
1320 | 410 | 390 | 41,8 |
1350 | 420 | 399 | 42,7 |
1385 | 430 | 409 | 43,6 |
1420 | 440 | 418 | 44,5 |
1455 | 450 | 428 | 45,3 |
1485 | 460 | 437 | 46,1 |
Source: DIN EN ISO 18265 - Metallic materials - Conversion of hardness values |
Impact test
Mix-up test (X-ray fluorescence analysis)
Crack testing
Crack testing of materials and finished components belongs to the so-called non-destructive testing (NDT). These tests are characterized by the fact that the workpiece is not affected by the test in its subsequent use. As a rule, the defects detected here cannot be detected by a normal visual inspection.
Magnetic particle testing (MT)
Dye penetrant testing (PT)
Ultrasonic testing (UT)
Eddy current testing (ET)
X-ray testing (RT)
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