This class includes activities of the iron and steel industry as defined in the ECSC treaty:
- production of pig iron and steel resulting from ore or scrap reduction:
. production of foundry pig iron and steel making pig iron
. production of ferrous products obtained by direct reduction of iron ore, and other spongy ferrous products in lumps, pellets or similar forms
. production of steel in a converter or electric or other furnace
- production of high-carbon ferro-manganese and spiegeleisen
- production of hot rolled or cold rolled steel products (including those obtained by continuous casting):
. production of ingots, other primary forms and semi-finished products
. production and/or continuous coating of hot rolled wide strip, narrow strip, plates and sheets and wide flats
. production and/or continuous coating of cold rolled wide strip, plates and sheets
. production of tin-plate, electrolytically chromium coated sheet, black plate
. production of hot rolled steel bars and rod
. production of hot rolled heavy and light sections and sheet piling
. production of rails and other hot rolled railway materials

This class also includes:
- production of hot rolled products and cold rolled wide strip and sheet, coated or uncoated, further worked than simply surface-treated, but not thereby classified to another heading

This class excludes:
production of cold rolled narrow strip, coated or uncoated, of a width up to 500 mm (non-ECSC) by cold reduction of hot rolled flat products or by slitting cold rolled flat products (ECSC), coated or uncoated cf. 27.32
- production of granules and powders of pig iron, iron or steel cf. 27.35
- production of ferro-alloys other than high-carbon ferro-manganese cf. 27.35
- production of forged semi-finished products, blanks and bars cf. 27.35
- production of iron and steel castings cf. 27.5

This class includes:
- manufacture of cast iron tubes and cast iron or steel centrifugally cast tubes
- manufacture of cast iron fittings: manufacture of non-malleable and malleable cast iron fittings and cast steel fittings for which connection is obtained by screwing for threaded fittings, by contact for socket fittings or by bolting for flange fittings

This class includes:
- manufacture of seamless tubes, by hot rolling, hot extrusion or hot drawing, or by cold drawing or cold rolling
- manufacture of welded tubes by cold or hot forming and welding, by forming and cold drawing, or by hot forming and reducing
- manufacture of steel tube fittings:
. flat flanges and flanges with forged collars of steel
. butt welding fittings of steel
. threaded fittings and other fittings of steel

This class excludes:
- manufacture of seamless tubes of centrifugally cast steel cf. 27.21

This class includes:
- manufacture of steel bars or sections by cold drawing, grinding or peeling

This class excludes:
- wire drawing or stretching cf. 27.34

This class includes:
- manufacture of coated or uncoated flat rolled steel products in coils or in straight lengths of a width less than 500 mm (non-ECSC) by cold re-rolling of hot rolled flat products

This class includes:
- manufacture of open sections by progressive forming on a roll mill or folding on a press of flat rolled products of steel

This class includes:
- manufacture of steel wire by cold drawing or stretching

This class includes:
- production of ferro-alloys except high-carbon ferro-manganese and of ferro-phosphor production of granular iron and iron powder; production of iron of exceptional purity by electrolysis or other chemical processes
- production of permanent way material except rails
- production of metal sand for sandblasting

This class includes:
- production of basic precious metals:
. production and refining of unwrought precious metals: gold, silver, platinum, etc.
- production of precious metal alloys
- production of precious metal semi-products
- production of silver rolled onto base metals
- production of gold rolled onto base metals or silver
- production of platinum and platinum group metals rolled onto gold, silver or base metals

This class excludes:
- manufacture of precious metal watch cases cf. 33.50
- manufacture of precious metal jewellery cf. 36.22

This class includes:
- production of aluminium from alumina
- production of aluminium from electrolytic refining of aluminium waste and scrap
- production of aluminium alloys
- semi-manufacturing of aluminium

This class also includes:
- production of aluminium oxide (alumina)

This class includes:
- production of lead, zinc and tin from ores
- production of lead, zinc and tin from electrolytic refining of lead, zinc and tin waste and scrap
- production of lead, zinc and tin alloys
- semi-manufacturing of lead, zinc and tin

This class includes:
- production of copper from ores
- production of copper from electrolytic refining of copper waste and scrap
- production of copper alloys
- manufacture of fuse wire or strip
- semi-manufacturing of copper

This class includes:
- production of chrome, manganese, nickel, etc., from ores or oxides
- production of chrome, manganese, nickel, etc., from electrolytic and aluminothermic refining of chrome, manganese, nickel, etc., waste and scrap
- production of chrome, manganese, nickel, etc., alloys
- semi-manufacturing of chrome, manganese, nickel, etc.

This class also includes:
- production of mattes of nickel

This group includes:
- manufacture of semi-finished products and various castings produced for third parties according to their specifications

This group excludes:
- manufacture of finished cast products such as pipes and related items cf. 27.21, boilers and radiators cf. 28.2 and 28.3, cast household items cf. 28.75, etc.

This class includes:
- casting of finished or semi-finished iron products
- casting of grey iron castings
- casting of spheroidal graphite iron castings
- casting of malleable cast iron products

This class excludes:
- casting carried out in connection with the manufacture of metal products cf. divisions 27.36

This class includes:
- casting of finished or semi-finished steel products
- casting of steel castings

This class excludes:
- casting carried out in connection with the manufacture of metal products cf. divisions 27.36

This class includes:
- casting of finished or semi-finished products of aluminium, magnesium, titanium, beryllium, scandium and yttrium
- casting of light metal castings

This class excludes:
- casting carried out in connection with the manufacture of metal products cf. divisions 27.36

This class includes:
- casting of finished or semi-finished heavy and precious metal products
- casting of heavy metal castings
- casting of precious metal castings

This class excludes:
- casting carried out in connection with the manufacture of metal products cf. divisions 27.36

This class includes:
- manufacture of ossature in metal for construction
- manufacture of industrial ossature in metal (ossature for blast furnaces, lifting and handling equipment, etc.)
- manufacture of prefabricated buildings mainly of metal:
. construction site huts, modular exhibition elements, etc.

This class excludes:
- manufacture of sections of ships cf. 35.11

This class includes:
- manufacture of reservoirs, tanks, and similar containers of metal, of a capacity exceeding 300 litres
- manufacture of metal containers for compressed or liquefied gas

This class excludes:
- manufacture of metal casks, drums, cans, pails, boxes, etc. of a capacity less than 300 litres cf. 28.7
- manufacture of transport containers cf. 34.20/2

This class includes:
- manufacture of steam or other vapour generators
- manufacture of auxiliary plant for use with steam generators: condensers, economizers, super-heaters, steam collectors and accumulators
- manufacture of nuclear reactors

This class also includes:
- pipe system construction comprising further processing of tubes generally to make pressure pipes or pipe systems together with the associated design and construction work

This class excludes:
- manufacture of isotope separators cf. 29.56

This class includes:
- forging, pressing, stamping and roll-forming of metal
- powder metallurgy: production of metal objects directly from metal powders by heat treatment (sintering) or under pressure

This class excludes:
- production of finely ground metal powder cf. 27

This class includes:
- plating, anodizing, etc. of metal
- heat treatment of metal
- deburring, sand blasting, tumbling, cleaning of metals
- colouring, engraving, printing of metal
- non-metallic coating of metal: plastifying, enamelling, lacquering, etc.
- hardening, buffing of metal

This class includes:
- boring, turning, milling, eroding, planing, lapping, broaching, levelling, sawing, grinding, sharpening, welding, splicing, etc. of metal work pieces

This class includes:
- manufacture of domestic cutlery such as knifes, forks, spoons, etc.
- manufacture of various cutting articles:
. razors and razor blades
. scissors and hair clippers

This class excludes:
- manufacture of cutting blades for machines cf. 28.62
- manufacture of hollowware, dinnerware or flatware cf. 28.75
- manufacture of cutlery of precious metal cf. 36.22

This class includes:
- manufacture of knifes and cutting blades for machines or for mechanical appliances
- manufacture of hand tools such as pliers, screwdrivers, etc.
- manufacture of saws and saw blades, including circular sawblades and chainsaw blades
- manufacture of interchangeable tools for hand tools, whether or not power operated, or for machine tools: drills, punches, dies, milling cutters
- manufacture of blacksmiths' tools: forges, anvils, etc.
- manufacture of vices, clamps

This class excludes:
- manufacture of power driven hand tools cf. 29.40/9

This class includes:
- manufacture of padlocks, locks, keys, hinges and similar hardware for buildings, furniture, vehicles, etc.

This class includes:
- manufacture of iron or steel boxes of a capacity less than 300 litres
- manufacture of pails, cans, drums, buckets

This class excludes:
- manufacture of tanks and reservoirs cf. 28.21

This class includes:
- manufacture of tins and cans for food products, collapsible tubes and boxes
- manufacture of metallic closures

This class includes:
- manufacture of metal cable, plaited bands and similar articles
- manufacture of articles made of wire: barbed wire, wire fencing, grill, netting, cloth, etc.
- manufacture of nails and pins

This class includes:
- manufacture of rivets, washers and similar non-threaded products
- manufacture of screw machine products: bolts, screws, nuts
- manufacture of springs:
. leaf springs, helical springs, torsion bar springs
. leaves for springs
- manufacture of chain, except power transmission chain

This class excludes:
- manufacture of power transmission chain cf. 29.14
- manufacture of clock or watch springs cf. 33.50

This class includes:
- manufacture of metal household articles:
. sauce-pans, frying pans and other non-electrical utensils for use at the table or in the kitchen
. base metal flat ware
. small kitchen appliances and accessories
. metal scouring pads
- manufacture of soldering equipment
- manufacture of baths, sinks, wash basins and similar articles of base metal
- manufacture of small metal goods for office use
- manufacture of safes, strong-boxes, armoured doors, etc.
- manufacture of cutlasses, swords, bayonets, etc.
- manufacture of ships' propellers
- manufacture of various articles in base metal:
. metal safety headgear
. clasps, buckles, hooks
. sign plates