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Zinc-Plated Low Carbon Steel · Grade 4.8 · Zinc Cr3 (Trivalent Chromium)
Cost-effective hex head lag screws conforming to DIN 571 standard. Manufactured from low carbon steel with trivalent chromium zinc plating (Zinc Cr3), providing reliable corrosion protection for general construction, interior structural applications, and dry indoor environments. The economical choice for high-volume structural timber fastening.
Request a QuoteFully compliant with DIN 571 hex head wood screw dimensional standard.
RoHS-compliant trivalent chromium zinc coating — no hexavalent chromium (Cr6+). Minimum 5–8 µm zinc layer.
Tensile strength 420 MPa min., suitable for general structural timber connections.
Low carbon steel construction offers excellent value for high-volume construction and interior applications.
WS8 to WS24 hex drive for efficient high-torque installation with standard metric wrenches.
M5 to M16, lengths from 20 mm to 300 mm. Custom lengths available on request.
Trivalent chromium zinc plating (Zinc Cr3) per ISO 4042 / DIN EN ISO 4042. RoHS compliant — contains no hexavalent chromium (Cr6+).
| Property | Value | Standard |
|---|---|---|
| Coating Type | Electrolytic Zinc + Trivalent Chromate Passivation | ISO 4042 |
| Chromium Type | Cr3 (Trivalent) — RoHS Compliant | RoHS Directive 2011/65/EU |
| Min. Zinc Layer Thickness | 5 µm (standard) / 8 µm (available) | ISO 4042 / DIN 267-28 |
| Salt Spray Resistance | ≥ 72 hours (white rust) / ≥ 120 hours (red rust) | ISO 9227 |
| Coating Appearance | Silver-blue iridescent | — |
| Operating Temperature | Up to +150°C (coating integrity) | — |
| Hexavalent Chromium (Cr6+) | None — fully RoHS compliant | RoHS / REACH |
⚠️ Not recommended for direct outdoor exposure, marine environments, or contact with treated timber (ACQ/CCA). For such applications, use stainless steel grades.
All dimensions conform to DIN 571 standard. Tolerances per ISO 4759-1.
| Nominal Diameter (d) | Thread Pitch (p) | Head Height (k) | Head Width A/F (s) | Wrench Size | Min. Length | Max. Length | Point Type |
|---|---|---|---|---|---|---|---|
| M5 | 2.0 mm | 3.5 mm | 8 mm | WS8 | 20 mm | 60 mm | Gimlet Point |
| M6 | 2.5 mm | 4.0 mm | 10 mm | WS10 | 20 mm | 140 mm | Gimlet Point |
| M8 | 3.0 mm | 5.5 mm | 13 mm | WS13 | 25 mm | 200 mm | Gimlet Point |
| M10 | 3.5 mm | 7.0 mm | 17 mm | WS17 | 30 mm | 200 mm | Gimlet Point |
| M12 | 4.0 mm | 8.0 mm | 19 mm | WS19 | 40 mm | 250 mm | Gimlet Point |
| M16 | 5.0 mm | 10.0 mm | 24 mm | WS24 | 60 mm | 300 mm | Gimlet Point |
✓ = Standard stock size | — = Available on request (MOQ applies)
| 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 | — | — | — | — | — | — | — | — | ✓ | — | ✓ | — | ✓ | ✓ | ✓ | — | ✓ | — | — | ✓ | — | ✓ | ✓ | — | ✓ | ✓ |
All values per ISO 898-1 for carbon steel fasteners, property class 4.8.
| Property | Value | Standard |
|---|---|---|
| Material | Low Carbon Steel (C ≤ 0.55%) | ISO 898-1 |
| Property Class | 4.8 | ISO 898-1 |
| Min. Tensile Strength (Rm) | 420 MPa | ISO 898-1 |
| Min. Yield Strength (Re / Rp0.2) | 340 MPa | ISO 898-1 |
| Min. Elongation (A) | 14% | ISO 898-1 |
| Hardness | 130–220 HV | ISO 898-1 |
| Surface Treatment | Zinc Cr3 (Electrolytic Zinc + Trivalent Chromate) | ISO 4042 |
| Coating Thickness | Min. 5 µm zinc | ISO 4042 |
| Salt Spray Resistance | ≥ 72 h (white rust) / ≥ 120 h (red rust) | ISO 9227 |
| Operating Temperature | −40°C to +150°C | — |
| Magnetic | Yes (ferromagnetic) | — |
Choose the right material grade for your application environment.
Pre-drilling is strongly recommended for all wood types to prevent splitting and ensure proper thread engagement. Pilot hole depth ≥ 2/3 of 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 |
| 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 | — |
Connecting beams, joists, and structural lumber in dry indoor construction environments.
Fastening roof trusses, purlins, and timber frame components in sheltered applications.
Heavy-duty furniture assembly, cabinet installation, and interior joinery work.
Securing wooden pallets, storage racking bases, and warehouse timber structures.
High-volume structural fastening in residential and commercial building projects.
Sheltered garden structures, pergolas, and landscaping timber in low-humidity environments.
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