MATERIAL TALK

Metals for Model Making

Choosing the right material can make or break a model making project. Metals offer strength, precision and a look you just can't get from plastic or wood. This guide runs through the metals we stock, how they perform, and which K&S and 4D products to reach for.

Why Alloy Matters for Modellers

Knowing the specific alloy of a metal isn't just technical jargon: it's crucial for understanding how the material will behave and perform. An alloy is a blend of metals (or a metal and another element), designed to bring out characteristics that pure metals lack.

  • Workability: different alloys have unique hardnesses (tempers) and compositions that dictate how easily they can be cut, bent, formed, soldered or machined.
  • Performance and durability: the alloy influences a metal's strength, stiffness, flexibility and resistance to corrosion or wear, all vital for structural integrity and longevity.
  • Appearance: alloys offer distinct colours and finishes, adding to the aesthetic realism or decorative quality of your model.
  • Specialised functions: some alloys are engineered for specific tasks, such as high electrical conductivity, spring properties or chemical resistance.

Overview
Metal
Characteristics
Common Uses
Brass
CharacteristicsDurable, corrosion-resistant, good workability, classic aesthetic, conductive.
Common UsesIntricate components, decorative elements, architectural features, miniature electronics.
Aluminium
CharacteristicsLightweight, corrosion-resistant, adaptable, good workability.
Common UsesAerospace models, lightweight structures, custom fixtures, decorative elements.
Copper
CharacteristicsExcellent electrical conductivity, flexible, corrosion-resistant, attractive patina.
Common UsesElectrical circuits, delicate artistic pieces, architectural details, etching.
Stainless Steel
CharacteristicsHigh strength, excellent durability, superior corrosion and stain resistance.
Common UsesRobust structural components, medical device models, durable decorative elements, outdoor models.
Tin Coated (Tinplate)
CharacteristicsCorrosion-resistant coating, easily solderable, bright finish, good workability.
Common UsesMiniature electronics, custom packaging, architectural details, soldered structures.
Music Wire
CharacteristicsHigh carbon steel, spring-tempered, excellent elasticity, phosphate-coated.
Common UsesSprings, linkages, rigging, control rods, precise mechanisms.

Note: All tolerance information provided on our product pages applies to SKU products and does not apply to any custom cut job or service.

Brass

Brass is a real workhorse for model makers: durable, corrosion-resistant and easy to shape into intricate components, decorative elements and architectural features. It also takes solder well, which makes it a favourite for marine models and outdoor railway layouts.

K&S Specifics

K&S brass products predominantly use Alloy 260 (Cartridge Brass), and for tubing sometimes Alloy 272 (Yellow Brass), both copper-zinc alloys.

  • Alloy 260: around 70% copper and 30% zinc. Excellent cold-working properties, ductile and good for bending and forming.
  • Alloy 272: around 65% copper and 35% zinc. Slightly harder than 260 but still workable.
  • Tubing: 1/2 to 3/4 hard temper, seamless, mill finish (ASTM B135).
  • Rod: 1/4 hard temper, mill finish (ASTM B134).
  • Sheet and strip: 1/2 hard temper, mill finish (ASTM B36).
Brass Sheet (Imperial) Brass Sheet (Imperial) From £4.30 Brass Round Rod (Metric) Brass Round Rod (Metric) From £3.65 Brass Strip (Metric) Brass Strip (Metric) From £4.10 Brass Mesh, Square Hole Brass Mesh, Square Hole From £15.80

Aluminium

Aluminium is prized for being lightweight and corrosion-resistant, which makes it a natural choice for intricate components, lightweight parts, decorative elements and fine architectural fixtures. It's also easy on the hands during handling and installation.

K&S Specifics

  • Alloy 3003 (H14): an aluminium-manganese alloy with very good corrosion resistance and workability. Used for tubing (.014"/.016" wall) and sheet (.016", .032", .064").
  • Alloy 6061 (T6): aluminium-magnesium-silicon, heat-treatable, giving high strength for demanding structural applications. Used for thicker tubing, rod (1/8" to 1/2") and heavier sheet.
  • Alloy 1100 (O, annealed): commercially pure aluminium, soft and very easy to shape. Used for thin rod (1/32" to 3/32") and non-colour foil.
  • Alloy 1235 (O, annealed): very high purity with exceptional malleability, used for colour foil.
Aluminium Sheet (Imperial) Aluminium Sheet (Imperial) From £2.60 Aluminium Sheet (Metric) Aluminium Sheet (Metric) From £2.00 Aluminium Round Tube (Imperial) Aluminium Round Tube (Imperial) From £1.70 Aluminium Strip (Metric) Aluminium Strip (Metric) From £3.35

Copper

Copper's natural corrosion resistance and warm, distinctive colour make it a lovely material for intricate components in electronics, electrical circuits, decorative elements and architectural fixtures. It's also a favourite for etching and forming.

K&S Specifics

  • Alloy 122 (DHP copper): Deoxidised High Phosphorus copper, highly resistant to hydrogen embrittlement during welding or brazing, with good formability. Used for tubing (ASTM B251).
  • Alloy 110 (ETP copper): 99.9% pure, with excellent electrical and thermal conductivity plus good ductility. Used for rod (ASTM B249), sheet and strip (ASTM B152), and foil (soft/annealed).
Copper Sheet Copper Sheet From £8.75 Soft Bendable Copper Tube Soft Bendable Copper Tube (assorted) From £5.45 Copper Wire Mesh (Flexible) Copper Wire Mesh (Flexible) From £6.05 Copper, Square Tube Copper, Square Tube From £8.55

Stainless Steel

When a model needs to stand up to wear and the elements, stainless steel is the answer. Its strength and corrosion resistance make it well suited to load-bearing components, miniature machinery parts, rigging, and models exposed to harsh or damp environments.

K&S Specifics

  • Alloy 304/304L: the standard austenitic stainless, roughly 18% chromium and 8% nickel. Used for welded tubing (ASTM A269).
  • Alloy 302: similar to 304, used for smaller rod diameters (1/16" to 1/8").
  • Alloy 303: free-machining, with added sulphur to improve machinability. Used for larger rod diameters (3/16" and up).
  • Alloy 430: ferritic and magnetic, with less nickel but good formability. Used for sheet and strip, with a 2BA bright-annealed finish and a clear PVC protective coating.
Stainless Steel Sheet Stainless Steel Sheet From £4.95 Stainless Steel Round Rod (Imperial) Stainless Steel Round Rod (Imperial) From £2.75 Stainless Steel Strip Stainless Steel Strip From £1.30 Stainless Steel Round Tube (Imperial) Stainless Steel Round Tube (Imperial) From £5.99

Tin Coated Steel

Tinplate is steel with an electrolytic tin coating, giving it enhanced corrosion resistance and making it easy to solder. It's handy for custom packaging, architectural elements and soldered structures where you want a bright, clean finish.

K&S Specifics

Electrolytic tin-coated carbon steel, per ASTM B545.

  • 0.008" thickness: standard electrolytic tin coating, with a polished, bright and clean appearance.
  • 0.013" thickness: a dull matte finish, subdued and non-reflective, with reduced glare and fingerprint resistance.
Tin Coated Steel Sheet (Imperial) Tin Coated Steel Sheet (Imperial) From £5.30 Steel Tinplate Steel Tinplate From £2.80

Music Wire (Piano Wire)

Also known as piano wire, this high-carbon steel is celebrated for its exceptional tensile strength and flexibility. It's a go-to for springs, linkages, rigging, control rods, instrument strings, jewellery and stop-motion animation armatures.

K&S Specifics

Conforms to ASTM A228: high-carbon steel (0.80% to 1.00% carbon), spring-tempered for elasticity and tensile strength, and phosphate-coated for durability and corrosion resistance.

Music/Piano Wire (Imperial) Music/Piano Wire (Imperial) From £1.50 Music/Piano Wire (Metric) Music/Piano Wire (Metric) From £2.10