Key criteria
The right finishing subcontractor cuts scrap, lowers cost and keeps delivery on time. Check five things: a quality standard (ISO 9001), a test certificate on every lot, capacity that matches your volume, lot-to-lot consistency, and clear communication / language.
For exports, watch restricted substances too — zinc plating should be Cr3+ (Cr6-free) with RoHS/REACH documentation.
What foreign factories (Japanese/Chinese/Korean) should ask
Do they support your language (Japanese/Chinese/Korean/English) so specs are clear? Do they have experience with automotive/electronics maker standards? Can they hold a hardness (HRC) band and a salt-spray rating to your spec?
Ask about logistics too: do they pick up and deliver to your industrial estate, and on what cycle?
Red flags to avoid
No test certificates, no in-house lab, refusal to accept a sample, or dodging questions about Cr3+/RoHS.
Best practice: send a sample to be processed and tested first, and review the real report before committing to a large lot.
FAQ
How do I choose a plating subcontractor?+
ISO 9001, a certificate per lot, capacity for your volume, lot-to-lot consistency, and language plus export documentation (Cr3+/RoHS).
What languages can you handle for foreign factories?+
V.S. Heat Treatment supports Thai, English, Japanese, Chinese and Korean — so specs are communicated precisely.
Can I test before a full order?+
Yes — send a sample, we harden or plate it, run lab tests and return it with a report.
