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Materials

Parts grouped by what they are made of. A material appears here only where the maker published it: grade, alloy or layup as stated, never inferred from what a part looks like or what it usually is.

12,603 of 109,316 parts carry a material — 11.5%. That number is low and it is meant to be. Almost no retail listing says what an alloy is, and a catalogue that guessed would look far more complete while being worth far less. A brake disc is probably cast iron and a hose is probably rubber; neither guess belongs in a field somebody might rely on.

Why the distinctions matter

The distinctions kept here are the ones that change a decision: carbon by layup, because prepreg and wet lay-up differ by about a third in weight; titanium by grade, because Ti-6Al-4V gives up where Ti-6242 keeps going; nickel superalloys separately from steel, because that is what survives a turbine inlet.

Material register

Browse by family

Open one family at a time; every material keeps its source-linked example parts.

01Steel11 materials · 3817 records

Stainless Steel (grade not disclosed)3299

and 3293 more

Stainless Steel 304L241

and 235 more

Steel (grade not disclosed)180

Use when a vendor says only "steel". Most OEM 993 brackets and carriers are stamped mild steel.

and 174 more

Chromoly Steel42

and 36 more

Stainless Steel 32124

Titanium-stabilised; resists sensitisation at exhaust temperatures better than 304.

and 18 more

9310 Alloy Steel19

Case-hardening gear steel.

and 13 more

4340 Alloy Steel5

Through-hardening steel used for conrods, crankshafts and stub axles.

Mild Steel4

Maraging Tool Steel 1.27091

EN40B nitriding steel1

Chromium-molybdenum steel intended to be nitrided. Used for crankshafts where a hard case over a tough core matters more than outright tensile strength.

Tool Steel (grade not disclosed)1

Use when a primary source states tool steel but does not publish a grade.

02Trim and upholstery4 materials · 2768 records

Leather2529

Includes Alcantara where the seller names it.

and 2523 more

Foam114

Seat and sound-deadening foam.

and 108 more

Textile108

Felt, carpet and woven trim.

and 102 more

Cork17

Gaskets and seals on the older cars.

and 11 more

03Aluminium6 materials · 2614 records

Aluminium (alloy not disclosed)2256

and 2250 more

6061-T6 Aluminium327

and 321 more

7075-T6 Aluminium18

Considerably stronger than 6061 but poor weldability and lower corrosion resistance — a machined-part alloy, not a fabricated one.

and 12 more

Forged Aluminium10

and 4 more

Proprietary high-strength aluminum alloy2

Vendor-specific composition not publicly disclosed.

Alusil (AlSi17Cu4Mg)1

Hypereutectic cylinder alloy used by Porsche where the bore runs directly on etched silicon.

04Composites8 materials · 1804 records

Carbon Fibre (layup not disclosed)1279

Use when a vendor says only "carbon fibre". Do not assume prepreg.

and 1273 more

Carbon / Aramid Hybrid279

Carbon with Kevlar, usually for impact and penetration resistance rather than stiffness — hence its use in seat shells.

and 273 more

Glass Fibre Reinforced Plastic (GRP)118

Heavier and far more flexible than carbon. Most cheap "carbon-look" body panels are GRP underneath.

and 112 more

Carbon Fibre (prepreg, autoclave cured)98

"Dry carbon". Typically 30–40% lighter than the same part in wet lay-up, and the only route that reliably holds OEM panel gaps.

and 92 more

Composite (type not disclosed)17

and 11 more

Aramid (Kevlar)10

and 4 more

Forged Carbon (chopped tow compression moulded)2

Chopped tow pressed in a matched mould. Distinctive marbled appearance, isotropic rather than directional — do not assume woven-prepreg properties.

DuraForm HST Composite1

Proprietary 3D Systems SLS composite. The reviewed public material page names the grade and its performance class but does not publish a complete formulation, so no fibre or matrix chemistry is inferred.

05Polymers11 materials · 1168 records

Rubber730

For OEM mounts and bushings where the compound is not published.

and 724 more

Elastomer175

and 169 more

Polymer (type not disclosed)125

and 119 more

TPU56

and 50 more

Polycarbonate29

Roughly half the mass of the glass it replaces, and it scratches. A track answer, not a road one.

and 23 more

Delrin / POM19

and 13 more

ABS19

and 13 more

Polyamide 127

and 1 more

PTFE6

Low-friction fluoropolymer. In brake lines it is the core that carries the fluid; the stainless braid only stops it expanding.

TPU / polyurethane lattice1

BASF Forward AM Ultrasint TPU011

Flexible TPU powder used for Multi Jet Fusion lattice structures; recorded only where the product manufacturer states the exact grade.

06Titanium2 materials · 901 records

Titanium (grade not disclosed)845

Use when a vendor markets a part as titanium without publishing the alloy. Do not guess a grade.

and 839 more

Ti-6Al-4V (Grade 5)56

and 50 more

07Glass1 materials · 383 records

Glass383

Laminated or toughened; the listing rarely says which.

and 377 more

08Ceramics3 materials · 236 records

Ceramic233

Brake friction material and coatings. Distinct from carbon-ceramic, which is a composite.

and 227 more

Carbon Ceramic (C/SiC)2

Carbon fibre reinforced silicon carbide, as used in PCCB and aftermarket equivalents.

Ceramic Matrix Composite1

09Nickel superalloys3 materials · 234 records

Inconel (grade not disclosed)123

and 117 more

Inconel 62592

and 86 more

Inconel 71819

and 13 more

10Magnesium2 materials · 70 records

Magnesium Alloy58

About a third lighter than aluminium. Corrodes readily and is difficult to weld, which is why Porsche abandoned it for crankcases and why period cases crack.

and 52 more

Forged Magnesium12

Forging raises strength and stability over cast magnesium; the basis of current motorsport wheels.

and 6 more

11Copper alloys2 materials · 61 records

Copper35

Chosen for conduction, in washers and electrical joints.

and 29 more

Brass26

Used where a fitting has to seal and not seize.

and 20 more

12Carbon1 materials · 34 records

Graphite34

Bearings, seals and brushes. Not a carbon fibre composite.

and 28 more

13Iron2 materials · 21 records

Cast Iron20

and 14 more

Cast Iron1

Heavy and stable under heat, which is why brake discs stayed with it long after everything else moved on.

14Coatings and platings2 materials · 13 records

Nickel Silicon Carbide plating8

Hard, low-friction bore plating. The functional surface of a billet aluminium cylinder — the aluminium is the structure, the plating is the wear face.

and 2 more

Nikasil coating5

Nickel-silicon carbide bore plating used on the 993 engine. Its sensitivity to high-sulphur fuel is the origin of the 993 bore-wear reputation.