Industries We Serve
Finishing and heat treatment for small metal parts across many industries
We provide hardening and finishing of small metal parts to manufacturers across many industries — from screw, nut and bolt makers to automotive, construction, machinery and electronics plants. With high-volume capacity, lot-by-lot quality control, test certificates and nationwide delivery, we understand each sector's specifications and consistently deliver work that meets requirements.
Sector comparison at a glance
The same screw geometry is specified very differently depending on where it ends up. This is what changes between sectors — the class, the coating system and the failure mode the specification is written to prevent.
| Sector | Typical parts | Typical class | Typical coating | Key risk |
|---|---|---|---|---|
| Automotive & Parts | Bolts, nuts, screws, washers, springs | 8.8 / 10.9 / 12.9 | Zn + Cr3+, 5–12 µm | Vibration loosening, fatigue, hydrogen embrittlement on 10.9 / 12.9 |
| Construction & Structural | Anchor bolts, structural bolts, nuts, washers | 4.6 / 4.8 / 8.8 | Zn + Cr3+ + sealer, 8–25 µm | Galvanic corrosion, outdoor exposure, thread fit after coating |
| Machinery | Bolts, pins, screws, springs | 8.8 / 10.9 / 12.9 | Zn phosphate + oil | Shock overload, thread galling, pin wear, spring relaxation |
| Agricultural Machinery | Bolts, nuts, screws, pins | 8.8 / 10.9 | Zn + Cr3+ + sealer, 8–15 µm | Abrasive wear, fertiliser crevice corrosion, shock loading |
| Electronics | Screws, washers, nuts, pins | 4.8 / 8.8 | Zn + Cr3+ clear, 3–8 µm | Contamination, plating blisters, burrs, thread fit on thin deposits |
| Solar Mounting & Racking Hardware | Racking bolts, T-bolts, module clamp screws, rail nuts, washers | 8.8 · A2 / A4 | Zn + Cr3+ + sealer, 8–25 µm | Decades of outdoor exposure, aluminium-to-steel joints, preload loss under wind cycling |
| EV & Battery Assembly Fasteners | Pack and module bolts, enclosure screws, washers, pins | 8.8 / 10.9 / 12.9 | Zn + Cr3+, hexavalent-free, 5–12 µm | Delayed fracture at high preload, hexavalent-free compliance, particles inside a sealed pack |
| Furniture & Knock-Down Hardware | Furniture screws, KD connector bolts, cam fittings, decorative washers | no class stated | Zn + Cr3+ clear / black · black oxide | Colour drift between batches, coverage in the recess, drive strength on tapping screws |
| Fastener Manufacturers — Toll Processing | Whole production lots — screws, bolts, nuts, washers | 4.8 – 12.9 · nuts 8 / 10 / 12 | barrel Zn + Cr3+ · phosphate + oil | Class conformance of the lot, decarburisation, traceability, re-work of a reject |
| Steel Structure & Fabrication | Anchor bolts, structural bolts, nuts, washers, roof screws | 8.8 / 10.9 | Zn + Cr3+ + sealer, 8–25 µm | Assembly integrity, coating friction versus tightening method, embrittlement on class 10.9 |
| Marine & Fishing Industry | Deck bolts, nuts, washers, pins, gear fittings | 4.8 / 8.8 · A4-70 | Zn + Cr3+ + sealer, 12–25 µm | Chloride attack, crevice and galvanic corrosion, hydrogen from the service environment |
The bands on this page are typical industry values, not a guarantee for any specific part. The governing drawing, customer specification and standard always take precedence, and every value is confirmed against your part before production. V.S. Heat Treatment operates under ISO 9001:2015; no other certification or sector approval is claimed.