Zinc Plating • Heat Treatment • Phosphating in Phra Nakhon Si Ayutthaya
Finishing for small parts — screws, nuts, bolts, washers and all hardware — for factories and shops in Phra Nakhon Si Ayutthaya. ISO 9001:2015 with salt-spray test certificates.
We run one plant, and it is in Samut Sakhon. This page covers collection and delivery for customers in Phra Nakhon Si Ayutthaya — it is not a branch or a facility in Phra Nakhon Si Ayutthaya.
Customers in Phra Nakhon Si Ayutthaya can send work to V.S. Heat Treatment any business day. We specialize in high-volume small parts such as screws, nuts, bolts, washers, pins and rivets, with capacity up to 2,000 tonnes per month and in-house lab quality control on every lot.
Industrial estates & zones we serve
V.S. Heat Treatment serves factories and manufacturers in the industrial estates and zones of Phra Nakhon Si Ayutthaya.
Why factories in Phra Nakhon Si Ayutthaya choose us
Small-part specialists
Processes built specifically for screws, nuts, bolts and washers — minimizing parts sticking together, clogged threads and uneven coating.
Nationwide delivery
Pickup and delivery to plants in Phra Nakhon Si Ayutthaya through partner carriers, on time, with full piece counts on every lot.
Certified results
Every job ships with hardness (HRC) and salt-spray results to ASTM B117, ready to pass on to your end customer.
Tunable specs
Choose plating color, coating thickness and hardness level to match how the part is actually used.
Services for Phra Nakhon Si Ayutthaya customers
Every plating and heat-treatment process under one roof
The distance from Phra Nakhon Si Ayutthaya to our plant in Samut Sakhon is no obstacle. Most customers use parcel freight or their own factory transport. We help coordinate logistics and report job status at every step — contact our team to plan a pickup/delivery cycle that fits your volume.
FAQ — Phra Nakhon Si Ayutthaya
How do you handle work from Phra Nakhon Si Ayutthaya?+
Send parts via parcel freight or your factory transport to Samut Sakhon. Once finished, we ship them back with test certificates. Ask about pickup cycles via LINE or phone.
Do you accept small low-volume jobs?+
Yes — flexible minimums suit both mass production and sample/small lots. Contact us for a quote based on your real volume.
Do you provide quality certificates?+
Yes. Every lot includes hardness and salt-spray (corrosion) results under our ISO 9001:2015 system.
How long does it take?+
It depends on part type and volume, including transit to and from Phra Nakhon Si Ayutthaya — contact our team to agree on a delivery schedule.
Nearby provinces in Central Thailand
About this province
What is manufactured here
The factory mix concentrated in this province decides which finishes get ordered most.
- electronics
- automotive & parts
- general manufacturing & SMEs
- steel & metalworking
Named estates and factory districts
Real place names in the province. IEAT-designated estates are marked.
- Rojana Industrial ParkIEAT-designatedBangkok Port (Khlong Toei)
- Hi-Tech (Ban Wa) Industrial EstateIEAT-designatedBangkok Port (Khlong Toei)
- โรจนะ
- ไฮเทค (บ้านหว้า)
- บางปะอิน
- นครหลวง
- วังน้อย
- แฟคตอรี่แลนด์ วังน้อย
- สวนอุตสาหกรรมโรจนะ 2
Parts we most often take from this area
โบลต์ยานยนต์ · สกรูอิเล็กทรอนิกส์ · พิน · ชิ้นส่วนปั๊ม
What work from this province has to meet
These figures come from the industries concentrated here, not from a national average.
| Property class | Salt spray | Hardness | Materials seen | Standards | |
|---|---|---|---|---|---|
| Automotive & Parts | 8.8 / 10.9 / 12.9 | 240–720 h NSS | 28–45 HRC | SCM435, SCM440, S45C, 10B21 | ISO 898-1 · ISO 4042 · ISO 9227 · JIS |
| Electronics | 4.8 / 8.8 | 48–120 h NSS | ≤ ~40 HRC | carbon steel, stainless | ISO 4042 · RoHS/REACH · ISO 9227 |
| Solar Mounting & Racking Hardware | 8.8 · A2-70 / A4-70 where stainless is specified | 480–1,000 h NSS commonly requested | 22–32 HRC (class 8.8) | S45C, SCM435, SWCH10B21, SUS304 | ISO 898-1 · ISO 4042 · ISO 9227 · ISO 10683 |
Failure modes to watch on this kind of work
Questions we get from this province
- Which estates in Phra Nakhon Si Ayutthaya do you collect from?
- In Phra Nakhon Si Ayutthaya we take work from Rojana Industrial Park, Hi-Tech (Ban Wa) Industrial Estate, and from factory districts such as โรจนะ, ไฮเทค (บ้านหว้า), บางปะอิน, นครหลวง, วังน้อย, แฟคตอรี่แลนด์ วังน้อย. Plants in this area are concentrated in Automotive & Parts, Electronics, Solar Mounting & Racking Hardware, EV & Battery Assembly Fasteners, Fastener Manufacturers — Toll Processing, Steel Structure & Fabrication; parts come to the Samut Sakhon works and go back with a test certificate per lot.
- Do you handle export work from Phra Nakhon Si Ayutthaya?
- Yes. Estates in Phra Nakhon Si Ayutthaya sit near Bangkok Port. Where the end customer needs paperwork, we issue hardness and salt spray certificates to ISO 9227 / ASTM B117 per lot under ISO 9001:2015.
- What specification does work from Phra Nakhon Si Ayutthaya usually have to meet?
- It follows the local industry mix. For Automotive & Parts, common in Phra Nakhon Si Ayutthaya, the usual call-out is property class 8.8 / 10.9 / 12.9, hardness 28–45 HRC and 240–720 h NSS corrosion resistance, on SCM435, SCM440, S45C, 10B21.
- What hardness do the grades from Phra Nakhon Si Ayutthaya reach?
- The grades seen most from this area are SCM435, SCM440, SWCH10B21, SWCH10B33, S45C, S20C. Attainable hardness varies with grade and section, and the value specified in service after tempering is always below the as-quenched ceiling — the per-grade pages carry both numbers.
Route into the plant
Nearest port: Bangkok Port (Khlong Toei)