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Short answer
Carbon steels, alloy steels, tool steels and stainless steels 416 and 420 are magnetic. Aluminum, brass, copper and stainless steels 303, 304 and 316 are not. All metals conduct electricity: copper conducts best, followed by aluminum and brass; steels and stainless steels conduct much less.
PREMSA Industries team
2 min read
Updated: September 30, 2026
Category: Materials
Carbon steels, alloy steels, tool steels and stainless steels 416 and 420 are magnetic. Aluminum, brass, copper and stainless steels 303, 304 and 316 are not. All metals conduct electricity: copper conducts best, followed by aluminum and brass; steels and stainless steels conduct much less.
| Material | Magnetic? | Electrical conductivity |
|---|---|---|
| Copper C110 | No | Very high |
| Aluminum 6061-T6 and 7075-T6 | No | High |
| Brass C360 | No | Medium |
| Steel 1018, 1045, 1144, 12L14, 4140, 4340, 8620, 9840 and A36 | Yes | Low |
| Tool steel A2, D2 and H13 | Yes | Low |
| Stainless steel 416 and 420 | Yes | Very low |
| Stainless steel 303, 304/304L and 316/316L | No* | Very low |
* Stainless steels 303, 304 and 316 are not magnetic in their original condition, but machining and cold working can make them slightly magnetic.
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