All fasteners made from austenitic stainless steels are generally non-magnetic; a certain magnetisability may occur after cold processing.
Each material, including stainless steel, is labelled by its ability to be magnetisable. In all probability only vacuums will be fully non-magnetic. The gauge for the material permeability in a magnetic field is the magnetic permeability value µr for this material in relation to a vacuum. The material has a low magnetic permeability when µr near is equal to 1.
Examples: A2: µr ~ 1.8 / A4: µr ~ 1.015 / A4L: µr ~ 1.005 / AF1: µr ~ 5
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International comparison of material |
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Mat. no. |
Short name |
AISI1 |
UNS2 |
SS3 |
AFNOR4 |
BS5 |
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1.4006 |
X12Cr13 |
410 |
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2302 |
Z 10 C 13 |
410 S 21 |
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1.4016 |
X6Cr17 |
430 |
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2320 |
Z 8 C 17 |
430 S 17 |
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1.4301 |
X5CrNi18-10 |
304 |
S 30400 |
2332 |
Z 6 CN 18.09 |
304 S 15 |
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1.4303 |
X10CrNiS18-9 |
305 |
S 30500 |
x |
Z5CNI 8-11FF |
305 S 17/19 |
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1.4305 |
X 10 CrNiS 18-9 |
303 |
S 30300 |
2346 |
Z 8 CNF 18.09 |
304 S 31 |
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1.4306 |
X 2 CrNi 19-11 |
304 L |
S 30403 |
2352 |
Z 2 CN 18.10 |
304 S 11 |
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1.4307 |
X2CrNi18-9 |
304L |
S 30403 |
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1.4310 |
X 12 CrNi 177 |
301 |
S 30100 |
2331 |
Z 12 CN 18.08 |
301 S 22 |
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1.4567 |
X3CrNiCu18-9-4 |
304 |
x |
x |
x |
x |
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1.4541 |
X6CrNiTi18-10 |
321 |
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1.4401 |
X5CrNiMo17-12-2 |
316 |
S 31600 |
2347 |
Z 7 CND 17.02.02 |
316 S 31 |
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1.4404 |
X2CrNiMo17-12-2 |
316 L |
S 31603 |
2353 |
Z 3 CND 18.14.03 |
316 S 11 |
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1.4578 |
X3CrNiCuMo17-11-3-2 |
x |
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1.4571 |
X6CrNiMoTi17-12-2 |
316Ti |
S 31635 |
2350 |
Z 6 CNDT 17.12 |
320 S 31 |
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1.4439 |
X2CrNiMoN17-13-5 |
317 LMN |
S 31726 |
2562 |
Z 1 NCDU 25.20 |
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1.4541 |
X6CrNiTi 18-10 |
321 |
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2337 |
Z 6 CNT 18-10 |
x |
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1.4362 |
X2CrNiN32-4 |
2304 |
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1.4462 |
X2CrNiMoN22-5-3 |
2205 |
S 31600 |
2377 |
(Z 5 CNDU 21.08) |
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1.4539 |
X1NiCrMoCu25-20-5 |
904 L |
N 08904 |
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1.4565 |
X2CrNiMnMoNbN25-18-5-4 |
x |
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1.4529 |
X1NiCrMoCuN25-20-7 |
x |
N 08926 |
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1 AISI = American Iron and Steel Institute
2 UNS = Unified Numbering System
3 SS = Swedish Standard
4 AFNOR = Association Francaise de Normalisation (French National Standards Institute)
5 BS = British Standard
ASTM = American Society for Testing and Materials