Stainless Steel Wood Screws (Grade 304 & 316) – Manufacturer, Supplier & Exporter | Conex India
Conex Screws and Fasteners is a premier manufacturer and exporter of Stainless Steel Wood Screws in Grade 304 and Grade 316 from Jamnagar, India. With over 30 years of precision fastener manufacturing experience, we supply stainless steel wood screws to customers in the USA, UK, Australia, Canada, Germany, the Middle East, and 50+ countries worldwide.
What Are Stainless Steel Wood Screws?
Stainless Steel Wood Screws are self-tapping fasteners designed for use in timber, softwood, hardwood, MDF, chipboard, and composite wood panels. They feature a sharp gimlet point, coarse thread for excellent holding power in wood fibres, and are available with countersunk (CSK), round head, pan head, and raised countersunk head styles. Manufactured from austenitic stainless steel (A2 Grade 304 or A4 Grade 316), these screws offer excellent resistance to corrosion, staining, and rust in outdoor and marine environments.
Grade 304 vs Grade 316 Stainless Steel Wood Screws
Grade 304 (A2) contains 18% chromium and 8% nickel. Suitable for outdoor timber, garden furniture, decking, fencing in non-marine/inland environments.
Grade 316 (A4) contains 18% chromium, 10% nickel, and 2-3% molybdenum. Superior chloride and pitting resistance – the only choice for coastal structures, marine boatbuilding, dock hardware, and salt-spray environments.
Material Grades & International Equivalents
| Grade | UNS | EN | DIN | BS | IS | Composition |
|---|---|---|---|---|---|---|
| SS 304 (A2) | S30400 | 1.4301 | X5CrNi18-10 | 304 S31 | 06Cr19Ni10 | 18% Cr, 8% Ni |
| SS 316 (A4) | S31600 | 1.4401 | X5CrNiMo17-12-2 | 316 S31 | 06Cr17Ni12Mo2 | 18% Cr, 10% Ni, 2% Mo |
| SS 316L | S31603 | 1.4404 | X2CrNiMo17-12-2 | 316 S13 | 02Cr17Ni12Mo2 | Low carbon 316 |
Head Styles & Drive Types
| Head Style | Drive Type | Standard |
|---|---|---|
| Countersunk (Flat Head) | Phillips / Slotted / Pozi | DIN 7997 |
| Round Head | Phillips / Slotted | DIN 96 |
| Pan Head | Phillips / Pozi | DIN 7981 |
| Raised Countersunk | Phillips / Slotted | DIN 7995 |
| Hex Head | Hex Wrench | DIN 571 |
Size & Dimensional Chart – Metric (mm)
| Size | Thread Type | Head Dia CSK (mm) | Length Range (mm) |
|---|---|---|---|
| M3 | Coarse | 6.0 | 10–50 |
| M4 | Coarse | 8.0 | 12–70 |
| M5 | Coarse | 10.0 | 16–80 |
| M6 | Coarse | 12.0 | 20–100 |
| M8 | Coarse | 16.0 | 25–150 |
| M10 | Coarse | 20.0 | 40–200 |
Size & Dimensional Chart – Gauge / Imperial
| Gauge | Shank Dia (in) | TPI | Head Dia CSK (in) | Length Range (in) |
|---|---|---|---|---|
| #6 | 0.138 | 18 | 0.270 | 1/2”–2” |
| #8 | 0.164 | 15 | 0.322 | 5/8”–3” |
| #10 | 0.190 | 13 | 0.373 | 3/4”–4” |
| #12 | 0.216 | 11 | 0.425 | 1”–4” |
| 1/4” | 0.250 | 10 | 0.507 | 1”–5” |
| 5/16” | 0.313 | 9 | 0.635 | 1.5”–6” |
Key Features & Performance Metrics
- Grade 304 Corrosion Resistance: Excellent in outdoor/atmospheric environments
- Grade 316 Corrosion Resistance: Superior in coastal, marine, chloride-rich environments
- Tensile Strength: 500 MPa (A2-50/A4-50) to 700 MPa (A2-70/A4-70) per ISO 3506
- Thread Form: Coarse gimlet-point self-tapping thread for wood fibres
- Standards: ISO 1478, DIN 7971, DIN 7972, DIN 7981, DIN 7997, ISO 3506, ASME B18.6.1
- Drive Types: Slotted, Phillips, Pozi, Combination
- Temperature Range: -196°C to +870°C continuous service
Applications
Outdoor timber decking and cladding, marine dock and jetty construction, boat building and yacht fitting, garden furniture and pergola construction, coastal fencing and balustrades, timber frame construction, landscape timber structures, outdoor signage mounting, wooden window and door frames, ACQ-treated timber structures, and food processing plant timber fixtures requiring corrosion-resistant fasteners.
Why Choose Conex Over Other Manufacturers?
- 30+ Years of Experience: Three decades of stainless steel fastener manufacturing from Jamnagar, India
- Faster Turnaround: Standard sizes dispatched within 7–14 working days; urgent orders prioritised
- Superior Customer Support: Dedicated account managers across USA, UK, Australian and European time zones
- Excellent Communication: English-fluent technical team with prompt RFQ responses and proactive updates
- Global Exposure: Active exporters to 50+ countries – USA, UK, Australia, Germany, Canada, UAE and beyond
- Competitive Pricing: Direct manufacturer pricing with no trading margins
- Quality Assurance: ISO 3506 grade certification, MTC and dimensional inspection reports on request
- Custom Capability: Non-standard sizes, special alloys (316L), custom packaging, private labelling
Our Flexibility to Customise
Custom lengths, special diameters, non-standard thread pitches, special head and drive combinations, and surface treatments including passivation and electropolishing. We work from customer drawings. Both small sample quantities and large production runs accommodated.
What Separates Conex from Other Manufacturers
As a direct manufacturer in Jamnagar – India’s premier fastener hub – Conex controls the entire production process from wire drawing and cold heading through thread rolling. Full batch traceability and complete documentation for every export order: ISO 3506 grade certification, EN 10204 MTCs, RoHS/REACH compliance as standard.
Export-Worthy Packaging
- Inner: Polybags sorted by size, length, grade, and head type
- Outer: Double-wall corrugated export cartons
- Labelling: Grade (304/316), head style, drive, size, quantity, batch, country of origin on every carton
- Moisture protection: Desiccant packs for sea freight
- Palletisation: ISPM-15 heat-treated wooden pallets for FCL shipments
Technical Q&A – Stainless Steel Wood Screws 304 & 316
Q1. What is the difference between Grade 304 and Grade 316?
A: Grade 304 (A2) offers excellent general-purpose corrosion resistance for outdoor/inland applications. Grade 316 (A4) adds 2-3% molybdenum for superior resistance to chloride pitting – essential for coastal, marine, and salt-spray environments. Specify Grade 316 for structures within 1 km of the sea.
Q2. What thread type do stainless wood screws have?
A: Coarse, single-start thread with a sharp gimlet point designed to cut cleanly into wood fibres for maximum pull-out resistance. The unthreaded shank beneath the head clamps two timber pieces together tightly.
Q3. Are Grade 304 wood screws suitable for outdoor use?
A: Yes – Grade 304 is excellent for non-marine outdoor applications: garden furniture, decking, fencing, pergolas in inland locations. For coastal areas, Grade 316 is recommended.
Q4. What standards do your stainless wood screws conform to?
A: ISO 1478, DIN 7971 (slotted CSK), DIN 7972 (slotted round head), DIN 7981 (cross-recessed pan head), ISO 3506 (A2-70 / A4-70 property classes).
Q5. Can I use stainless wood screws with ACQ-treated timber?
A: Yes. Both Grade 304 and Grade 316 are compatible with ACQ and other modern timber preservatives. ACQ is highly corrosive to galvanised/zinc-plated screws, making stainless steel the correct choice.
Q6. What head styles are available?
A: Countersunk (flat), round head, pan head, raised countersunk, and hex head in slotted, Phillips, Pozi, and combination drives.
Q7. Are stainless wood screws magnetic?
A: Generally non-magnetic in the annealed state, but slight magnetism may develop after cold working during manufacturing – normal and does not affect performance.
Q8. What is A2-70 and A4-70?
A: ISO 3506 property classes: A2 = Grade 304, A4 = Grade 316; 70 = minimum tensile strength of 700 MPa. A4-70 is the premium specification for marine-grade wood screws.
Q9. Do you supply stainless decking screws?
A: Yes – Grade 316 countersunk decking screws in Phillips or Pozi drive, standard and custom lengths for various decking board thicknesses.
Q10. What is the minimum order quantity?
A: From 100 pieces for samples; standard production from 1,000 pieces per size. FCL quantities available. Contact us for a tailored quotation.
Q11. Do you provide material test certificates?
A: Yes – EN 10204 MTCs with chemical composition and mechanical properties for all export orders. ISO 3506 grade certification on request.
Q12. Can you supply both metric and imperial sizes?
A: Yes – metric (M3–M10) and imperial/gauge (#6 through 5/16”) to meet British, American, Australian, and international specifications.
Q13. Are your stainless wood screws RoHS compliant?
A: Yes – both 304 and 316 are free from RoHS-restricted substances. Compliance declarations provided on request.
Q14. What is the lead time?
A: Standard sizes: 7–14 working days. Custom dimensions: 3–4 weeks. Urgent requirements can be prioritised – contact our team.
Q15. Do you supply self-drilling stainless wood screws?
A: Yes – both gimlet point for softwood/pre-drilled applications and self-drilling point for hardwood applications are available.
Customer Testimonials
Andrew Morrison, Timber Construction Manager – Melbourne, Australia
“We have been using Conex Grade 316 stainless steel wood screws for coastal decking and dock construction for several years. Quality is outstanding – no staining, no corrosion, perfect dimensional consistency. Their team is responsive and deliveries always on schedule. Highly recommended.”
Sarah Mitchell, Procurement Director – Vancouver, Canada
“Conex supplied Grade 304 and 316 stainless wood screws for a major outdoor timber structure project. Products met all specifications, full documentation provided, pricing was very competitive. Conex will remain our preferred fastener supplier.”
Glossary of Related Terms
Grade 304 (A2): Austenitic stainless steel with 18% Cr and 8% Ni | Grade 316 (A4): Austenitic SS with added molybdenum for marine corrosion resistance | ISO 3506: International standard for stainless fastener mechanical properties | Gimlet Point: Sharp tapered point allowing direct wood penetration | Countersunk (CSK): Flat head sitting flush when fully driven | A4-70: Grade 316 with 700 MPa tensile strength – premium marine specification | ACQ Timber: Alkaline Copper Quaternary treated timber requiring SS fasteners | Passivation: Acid treatment enhancing stainless steel’s corrosion-resistant oxide layer | MTC: Material Test Certificate confirming chemical and mechanical properties
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Request a Quote for Stainless Steel Wood Screws
Ready to source Grade 304 and Grade 316 Stainless Steel Wood Screws from a trusted manufacturer with 30+ years of global export experience? Contact Conex today for competitive pricing, fast delivery, full ISO 3506 documentation, and expert technical support.
📧 Email: sales@conexscrews.com | 📞 Call: +91-22-43449323 | 🌐 Request a Quote Online
