| Grade | Typical properties | Typical parts | Tolerance | surface finishing |
| 45# carbon steel | Good overall properties after quenching and tempering, widely used | Shafts, gears, flanges, tooling | ±0.002 | Quenching and tempering, hardening, blackening, chrome plating |
| Q235/A3 | Plain carbon structural steel, low cost | Welded structures, bases, backing plates | ±0.02 | Sand blasting, painting (outsourced) |
| 40Cr | Quenched and tempered steel, stronger than 45# | Drive shafts, gears, connecting rods | ±0.002 | Quenching and tempering, induction hardening, blackening |
| 42CrMo | High strength, good hardenability | Heavy-duty shafts, large gears, mould parts | ±0.002 | Quenching and tempering, nitriding |
| GCr15 | Bearing steel, high hardness and wear resistance | Bearing sleeves, rollers, precision guide bushes | ±0.002 | Hardening + low tempering, mirror grinding |
| 20# steel | Low carbon, surface hardened by carburising | Wear-resistant surface parts, pins | ±0.01 | Carburising and hardening, blackening |
| H59/H62 brass | Free-machining, conductive, decorative | Electrodes, connectors, decorative parts, inserts | ±0.002 | Passivation, nickel/tin plating, polishing |
| T2 copper | Excellent electrical and thermal conductivity, soft | Electrodes, terminals, heat sinks | ±0.01 | Tin/silver plating (outsourced), polishing |
| TA2/TC4 titanium | High strength-to-weight ratio, corrosion resistant, difficult to machine | Aerospace / medical structural parts, corrosion-resistant parts | ±0.01 | Anodising (natural/coloured) |
| HT250 cast iron | Cast blank, vibration damping and wear resistant | Machine bases, finish machining of housing blanks | ±0.02 | Ageing, coating (outsourced) |
Tolerance in mm; values are the standard stably achievable range. Critical dimensions follow drawing tolerances. For grades not listed, please send drawings.