Home » Hex Head Wood Screws (DIN 571) - Stainless Steel (A2)

Hex Head Wood Screws (DIN 571) - Stainless Steel (A2)

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Hex Head Wood Screws — DIN 571

Stainless Steel A2 (SUS304) · Grade A2-70 · Passivated Finish

Heavy-duty hex head lag screws fully conforming to DIN 571 standard. Manufactured in A2 stainless steel (SUS304) with A2-70 strength grade and passivated surface finish. Ideal for structural timber connections, outdoor construction, and corrosion-resistant applications worldwide.

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DIN 571 · A2 Stainless Steel

Key Features

📐

DIN 571 Standard

Fully compliant with DIN 571 hex head wood screw dimensional standard.

🛡️

A2 Stainless Steel (SUS304)

Excellent corrosion resistance for indoor and outdoor applications.

⚡

Grade A2-70

Minimum tensile strength 700 MPa per ISO 3506-1.

✨

Passivated Surface

Clean passivation finish — no coating, natural stainless appearance.

🔧

External Hex Drive

WS8 to WS24 hex drive for high-torque installation.

📏

Wide Size Range

M5 to M16, lengths from 20 mm to 300 mm available.

Dimensional Specifications — DIN 571

Nominal Diameter (d) Thread Pitch (p) Head Height (k) Head Width A/F (s) Wrench Size Point Type
M5 2.0 mm 3.5 mm 8 mm WS8 Gimlet Point
M6 2.5 mm 4.0 mm 10 mm WS10 Gimlet Point
M8 3.0 mm 5.5 mm 13 mm WS13 Gimlet Point
M10 3.5 mm 7.0 mm 17 mm WS17 Gimlet Point
M12 4.0 mm 8.0 mm 19 mm WS19 Gimlet Point
M16 5.0 mm 10.0 mm 24 mm WS24 Gimlet Point

Available Sizes Matrix — A2 Stainless Steel

✓ = Standard stock size  |  MOQ applies for non-standard lengths

Ø \ Length 20 25 30 35 40 45 50 55 60 65 70 75 80 90 100 110 120 130 140 150 160 180 200 220 250 300
M5 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — — — — — — — — — — — — — — —
M6 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — — — — —
M8 — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — — — — — ✓ — — —
M10 — — ✓ ✓ ✓ ✓ ✓ — ✓ — ✓ — ✓ ✓ ✓ — ✓ — — ✓ — ✓ ✓ — — —
M12 — — — — ✓ — ✓ — ✓ — ✓ — ✓ ✓ ✓ — ✓ — — ✓ — ✓ ✓ — ✓ —
M16 — — — — — — — — ✓ — ✓ — ✓ ✓ ✓ — ✓ — — ✓ — ✓ ✓ — ✓ ✓

Mechanical Properties — A2-70 Grade

Property Value Test Standard
Material Grade A2 (SUS304 / 1.4301) ISO 3506-1
Strength Grade A2-70 ISO 3506-1
Min. Tensile Strength 700 MPa ISO 3506-1
Min. Yield Strength (0.2% proof) 450 MPa ISO 3506-1
Min. Elongation 20% ISO 3506-1
Hardness (max) 250 HV ISO 3506-1
Surface Treatment Passivated ASTM A967 / ISO 16048
Magnetic Properties Slightly magnetic (work-hardened) —
Operating Temperature −200°C to +300°C —
Corrosion Resistance Excellent (C3/C4 environment) ISO 12944

Chemical Composition — SUS304 / 1.4301 (A2 Stainless Steel)

Element Min % Max %
Chromium (Cr) 17.5 19.5
Nickel (Ni) 8.0 10.5
Carbon (C) — 0.07
Manganese (Mn) — 2.0
Silicon (Si) — 1.0
Phosphorus (P) — 0.045
Sulfur (S) — 0.015
Nitrogen (N) — 0.11
Iron (Fe) Balance —

Pre-Drilling Recommendations

A pilot hole must be pre-drilled depending on screw diameter and wood type. Pilot hole depth should be at least 2/3 of the screw length.

Screw Diameter Softwood — Pilot Hole Hardwood — Pilot Hole Clearance Hole
M5 3.0 mm 3.5 mm 5.5 mm
M6 3.5 mm 4.5 mm 6.5 mm
M8 5.0 mm 6.0 mm 9.0 mm
M10 6.0 mm 7.5 mm 11.0 mm
M12 7.0 mm 9.0 mm 13.0 mm
M16 10.0 mm 12.0 mm 17.0 mm

Recommended Tightening Torque (Reference Values)

Screw Size Softwood (N·m) Hardwood (N·m) Notes
M5 × 40 3 – 5 4 – 6 Use torque wrench
M6 × 50 6 – 9 8 – 12 —
M8 × 70 15 – 20 18 – 25 —
M10 × 100 30 – 40 35 – 50 —
M12 × 120 55 – 70 65 – 85 —
M16 × 150 120 – 150 140 – 180 —

Typical Applications

🏗️

Structural Timber Framing

Connecting beams, posts, and structural lumber in construction projects.

🌊

Marine & Coastal Construction

Superior corrosion resistance in salt-air and high-humidity environments.

🌿

Outdoor Decking & Pergolas

Weather-resistant fastening for exterior wood structures and garden features.

🏭

Industrial Equipment Mounting

Securing machinery bases and equipment to wooden platforms and pallets.

🏠

Facade & Cladding Systems

Attaching wooden cladding panels and battens to substructures.

♻️

Food & Pharmaceutical Facilities

Hygienic, non-contaminating fasteners for regulated environments.

Packaging & Ordering Information

📦 Standard Packaging

  • M5–M6: 100 / 200 / 500 / 1,000 pcs per box
  • M8–M10: 50 / 100 / 200 pcs per box
  • M12–M16: 10 / 25 / 50 pcs per box
  • Bulk / pallet quantities available on request
  • Custom packaging with FULLERKREG branding available

📋 Ordering Notes

  • MOQ: 1 box (standard sizes)
  • Custom lengths: MOQ 500 pcs, lead time 15–25 days
  • EN 10204 3.1 material certificates available on request
  • RoHS compliant
  • Country of Origin: China (full traceability)
  • Contact us for OEM / private label orders

Standards Compliance & Certifications

📐
DIN 571Hex Head Wood Screws dimensional standard
🔬
ISO 3506-1Mechanical properties of stainless steel fasteners
✅
ISO 9001:2015Quality management system certified
🌿
RoHS DirectiveRestriction of hazardous substances compliant
📄
EN 10204 3.1Material test certificate available on request
🇪🇺
REACH RegulationFully compliant

Frequently Asked Questions

Q1: What is the difference between A2 and A4 stainless steel for wood screws?
A2 (SUS304) offers excellent corrosion resistance suitable for most indoor and outdoor applications in non-marine environments. A4 (SUS316) contains molybdenum for superior resistance to chloride corrosion, recommended for marine or highly corrosive environments. For standard outdoor construction, A2-70 provides an excellent balance of performance and cost.
Q2: Do DIN 571 hex head wood screws require pre-drilling?
Yes, pre-drilling is strongly recommended, especially for hardwoods. The pilot hole prevents wood splitting and ensures proper thread engagement. Refer to our pre-drilling table above for recommended hole sizes based on wood type and screw diameter.
Q3: What wrench size is needed for each diameter?
M5 uses WS8, M6 uses WS10, M8 uses WS13, M10 uses WS17, M12 uses WS19, and M16 uses WS24. All sizes use standard metric hex (AF) wrenches or sockets.
Q4: Are material test certificates (MTC) available?
Yes. EN 10204 3.1 material test certificates are available upon request for all orders. Please specify your requirement when placing your order.
Q5: Can FULLERKREG supply custom lengths not listed in the standard range?
Yes, custom lengths are available with a minimum order quantity of 500 pieces. Lead time is typically 15–25 business days. Please contact our sales team for custom specifications.
Q6: Is A2 stainless steel magnetic?
A2 stainless steel (SUS304) is generally non-magnetic in its annealed state. However, cold working during manufacturing (such as thread rolling) may induce slight magnetism. This does not affect the corrosion resistance or mechanical properties of the fastener.
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