V.S. Heat Treatment
Heat treatment & metal finishing experts
Heating up
V.S. Heat Treatment
Heat treatment & metal finishing experts
VSHeat Assistant
AI helper, 24/7
High-volume heat treatment of screws, nuts, bolts, washers and small fasteners on continuous mesh-belt furnaces — plus eco-safe Cr3+ zinc plating, phosphate coating and an in-house testing lab, delivered on time to international standards.
0+
Years of experience
EST 1994
ISO
9001:2015
CERTIFIED
0+
tons / day
CAPACITY
Heat Treatment
Small-parts heat treatment service · 800+ tons/day
Zinc Plating Cr3+
Cr3+ zinc plating service · RoHS-safe
Phosphate Coating
Paint base layer and friction reduction
Testing Laboratory
Precise inspection and certification
We adapt processes to your part — from one-off prototypes to high-volume production.
Continuous mesh-belt furnaces deliver consistent quality on schedule and reduce your cost.
Every batch is tested with Vickers and X-ray instruments and shipped with a quality certificate.
Plating and testing — all under one roof
Trusted by manufacturers across Thailand and beyond
Automotive
Fasteners / Bolts & Nuts
Construction
Industrial Machinery
Agricultural Machinery
Electronics
We migrated entirely to RoHS-compliant Cr3+ in 2020. Here's why it matters.
Cr6+
Hexavalent · Legacy
Cr3+
Trivalent · Eco-safe
✓ V.S. Heat Treatment uses Cr3+ exclusively since 2020
Our engineers reply with a tailored quote within 24 hours.
Insights on metallurgy and surface treatment from our team
Pricing depends on material, part size, quantity and certification needs. Send us a photo and details — we'll quote within 24 hours. Or use the Quote Calculator for a quick estimate range.
Cr3+ (Trivalent Chromium) zinc plating uses chromium-3 ions, which are non-carcinogenic and meet RoHS/REACH directives. It replaces the older, hazardous Cr6+ (Hexavalent). We migrated entirely to Cr3+ in 2020.
Per ASTM B117: Cr3+ Blue passivation reaches 96 hours, Yellow 144 h, Black up to 240 h. We can engineer specs to exceed 280 h on demand.
Carbon steel (S45C, SCM440), alloy steel (SKD11, H13), stainless (SUS304, 316), and other materials by agreement. Send specs to our team for review first.
Yes — Hardness Test Report (HV/HRC), Coating Thickness Report (X-ray), Salt Spray Test Report (ASTM B117), Material Test Certificate. Issued with the order or separately.
Flexible — from a few prototype pieces to mass production of tens of thousands per month.
