German tool and mold makers face a bottleneck: domestic high-end shops are booked or expensive, but tolerance, hardness, and finish are non-negotiable. Taiwan offers a credible alternative — decades of experience with JIS tool steels widely used internationally.
Key tool steel grades — JIS vs. DIN
- Cold work: SKD11 ↔ 1.2379 (X153CrMoV12); SKS3 ↔ 1.2510
- Hot work: SKD61 ↔ 1.2344 (X40CrMoV5-1); SKD7 ↔ 1.2367
- HSS: SKH51 ↔ 1.3343 (HS6-5-2)
- Pre-hardened: NAK80 (close to 1.2767); HPM38 (corrosion-resistant)
Heat treatment integration
Taiwan's heat treatment infrastructure is dense — many shops work with hardening houses within miles, reducing turnaround. Experienced suppliers coordinate this as an integrated service.
Polish quality (SPI standards)
NAK80 and HPM38 polish to SPI A1. SKD61 typically reaches B-class without coating.
Key checks when outsourcing to Taiwan
- Material origin (Daido, Hitachi, Uddeholm) documented in mill cert
- Hardness tolerance specification (typically ±2 HRC)
- Dimensional stability after heat treatment
- Polish finish per SPI class
- FAI with hardness verification at multiple points
Typical lead times
- SKD11 stamping tool, ground to ±0.01mm: 4-6 weeks
- SKD61 die-cast mold with conformal cooling: 8-12 weeks
- NAK80 plastic injection mold, SPI A2 polish: 6-10 weeks
