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Zinc Plated Extension Springs Manufacturer | Seme Hardware
Zinc Plated Extension Springs – Custom Electro-Galvanized Tension Springs
ISO 9001 certified manufacturer of custom zinc plated extension springs. In-house electro-plating, fast sample turnaround (5-7 days), and competitive factory pricing.
What Are Zinc Plated Extension Springs?
Zinc plated extension springs (electro-galvanized tension springs) are helical springs that exert pulling force when stretched, with a protective zinc coating applied via electroplating.
At Dongguan Seme Precision Hardware Co., Ltd., we manufacture custom zinc plated extension springs to your exact specifications – used in automotive, industrial equipment, home appliances, and consumer products.
Key Advantages
| Advantage | Benefit |
Corrosion Resistance | 48-120 hours salt spray protection |
Cost-Effective | Affordable alternative to stainless steel |
Smooth Surface | Uniform bright finish |
Extended Life | 2-3x longer than uncoated springs |
Custom Colors | Blue, yellow, black, clear chromate available |
Options
| Parameter | Options |
Material | 65Mn, SWP-B, Alloy Steel，Stainless Steel |
Wire Diameter | 0.3mm – 8.0mm |
Outer Diameter | 3mm – 80mm |
Body Length | 5mm – 300mm |
End Configuration | Full loop, half loop, V-hook, extended hook, custom |
Zinc Plating Options
| Plating Type | Thickness Plating Type | Salt Spray Test | Best For |
Standard Zinc | 5-8 μm | 24-48 hours | Indoor, dry |
Medium Zinc | 8-12 μm | 48-72 hours | General industrial |
Thick Zinc | 12-25 μm | 72-120 hours | Outdoor, humid |
Zinc + Chromate | 8-15 μm | 96-200 hours | Enhanced protection |
Surface colors: Bright Zinc / Blue Zinc / Yellow Zinc / Black Zinc / Clear Chromate
Applications
Automotive – Brake pedals, clutches, door latches, seats
Industrial – Packaging machines, conveyors, valves
Home Appliances – Washing machines, refrigerators, ovens
Consumer Products – Power tools, fitness equipment, toys
We have supplied to tier 1 automotive suppliers in Europe and North America, and OEMs across 15+ countries.*
Quality Control – Every Batch Tested
| Test | Standard | Frequency |
Salt Spray Test | ASTM B117 | Per batch |
Plating Thickness | ASTM B487 | Per batch |
Load/Deflection | Custom spec | 100% |
Dimensional Check | Per drawing | 100% |
Test reports included with every shipment
Why Choose Seme Hardware?
✅ In-house plating – Full control, no outsourcing
✅ Fast samples – 5-7 days for prototypes
✅ Low MOQ – 500-1,000 pcs for standard sizes
✅ Direct pricing – No trading markup
✅ ISO 9001 certified
How to Order
Send your drawing or specification
Engineering review & DFM feedback
Sample production (5-7 days)
Mass production (10-20 days)
Quality inspection & shipping
FAQ
Zinc plated vs stainless steel – which to choose?
Zinc plated for indoor/general use. Stainless steel for marine, medical, or harsh outdoor environments.
What plating thickness do I need?
5-8μm for indoor dry use / 8-12μm for general industrial / 12-25μm for outdoor.
What is your MOQ?
Standard sizes: 500-1,000 pcs. Custom: 1,000-5,000 pcs. Samples: 10-50 pcs available.
How fast can I get samples?
5-7 days after drawing approval.
Contact Us
Ready to start your zinc plated extension spring project?
📧 Email: [email protected]
📞 WhatsApp / WeChat: +86 138 2726 4669
🌐 Website: www.semehardware.com
→ Send your drawing for a free quote. Response within 2 hours.
