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Compare official labels, inclusions, exclusions, examples, hierarchy, mappings, and practical fit notes.
Use this class for heat treatment of metals when the main activity includes General activities for the heat treatment of metals and Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal). Check exclusions and nearby codes before applying it to a mixed activity.
Use this class for coating of metals when the main activity includes Galvanising, including general (batch) hot-dip galvanising and Phosphate or chromate conversion coating. Check exclusions and nearby codes before applying it to a mixed activity.
Use this class for machining of metals when the main activity includes Boring, turning, milling, eroding, planing, lapping, broaching, levelling, sawing, grinding, sharpening, deburring, sandblasting, tumbling, polishing, buffing, welding, splicing, etc., of metalwork pieces and Cutting of and engraving or writing on metals by means of laser beams. Check exclusions and nearby codes before applying it to a mixed activity.
Use this group for treatment and coating of metals; machining when the main activity includes Coating of metals and Heat treatment of metals. Check exclusions and nearby codes before applying it to a mixed activity.
A short checklist before choosing one code over another.
These codes share C MANUFACTURING > 25 Manufacture of fabricated metal products, except machinery and equipment > 25.5 Treatment and coating of metals; machining before they diverge.
25.52, 25.53 already list another compared code as related or often confused.
25.51, 25.53 include official exclusions that may point to a better-fitting code.
25.52, 25.51, 25.53, 25.5 have non-exact Rev. 2 to Rev. 2.1 mappings; review old records before migration.
| Comparison field | 25.52 | 25.51 | 25.53 | 25.5 |
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| Official title | Heat treatment of metals | Coating of metals | Machining of metals | Treatment and coating of metals; machining |
| Plain-language summary | Use this class for heat treatment of metals when the main activity includes General activities for the heat treatment of metals and Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal). Check exclusions and nearby codes before applying it to a mixed activity. | Use this class for coating of metals when the main activity includes Galvanising, including general (batch) hot-dip galvanising and Phosphate or chromate conversion coating. Check exclusions and nearby codes before applying it to a mixed activity. | Use this class for machining of metals when the main activity includes Boring, turning, milling, eroding, planing, lapping, broaching, levelling, sawing, grinding, sharpening, deburring, sandblasting, tumbling, polishing, buffing, welding, splicing, etc., of metalwork pieces and Cutting of and engraving or writing on metals by means of laser beams. Check exclusions and nearby codes before applying it to a mixed activity. | Use this group for treatment and coating of metals; machining when the main activity includes Coating of metals and Heat treatment of metals. Check exclusions and nearby codes before applying it to a mixed activity. |
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| Official exclusions | Not stated separately in available source data |
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| Parent hierarchy | C MANUFACTURING > 25 Manufacture of fabricated metal products, except machinery and equipment > 25.5 Treatment and coating of metals; machining > 25.52 Heat treatment of metals | C MANUFACTURING > 25 Manufacture of fabricated metal products, except machinery and equipment > 25.5 Treatment and coating of metals; machining > 25.51 Coating of metals | C MANUFACTURING > 25 Manufacture of fabricated metal products, except machinery and equipment > 25.5 Treatment and coating of metals; machining > 25.53 Machining of metals | C MANUFACTURING > 25 Manufacture of fabricated metal products, except machinery and equipment > 25.5 Treatment and coating of metals; machining |
| Rev. 2 mapping |
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