Construction nails (wire nails, building nails, structural nails) from ULAMEX are manufactured from low-carbon steel wire and available in both hot-dip galvanized and bright (uncoated) finishes. Our programme covers smooth shank nails (standard wire nails), ring shank nails (annular ring nails for enhanced withdrawal resistance) and roofing nails (clout nails with large flat heads), in diameters from 2.0 to 6.0 mm and lengths from 30 to 200 mm. Sold by the kilogram in 5 kg and 25 kg boxes, construction nails remain the fastest and most economical fastening method for timber construction, formwork and general building applications.
Why Nails Still Matter in Modern Construction
Despite the proliferation of screws, bolts and proprietary connectors, wire nails remain the dominant fastener in timber construction by volume. The reasons are fundamental: nails are driven in seconds with a hammer or pneumatic nailer; they are specified by structural engineers in EN 14592 (Timber structures — Dowel-type fasteners) and EN 1995-1-1 (Eurocode 5 — Design of timber structures) with well-understood load tables; and their shear resistance exceeds that of equivalent-diameter screws due to the higher ductility of nail wire compared to screw thread.
In formwork construction, smooth shank nails are deliberately chosen because they can be extracted (pulled) during formwork stripping without destroying the timber — a critical operational advantage over ring shank nails or screws that would split the timber on extraction.
Nail Types and Applications
Smooth Shank Nails (Wire Nails / Common Nails)
The standard construction nail with a plain, cylindrical shank and flat head. Manufactured by cold-heading from drawn wire, smooth shank nails are the default choice for:
- Concrete formwork — nailing plywood, boards and battens to formwork frames. The smooth shank allows clean extraction after concrete curing
- Temporary fixings — bracing, propping and alignment during construction
- General carpentry — non-structural timber-to-timber connections
- Packaging — nailing crates, pallets and shipping containers
Ring Shank Nails (Annular Ring Nails)
Nails with concentric rings pressed into the shank during manufacture. The rings interlock with timber fibres and provide up to 40–60% higher withdrawal (pull-out) resistance compared to smooth shank nails of the same diameter. Specified for:
- Structural timber connections — rafters, joists, studs and bracing per EN 14592
- Timber-frame wall panel assembly — sheathing board attachment (OSB, plywood) where racking resistance depends on nail withdrawal capacity
- Decking and cladding — permanent timber deck boards and external cladding boards
- Fence construction — securing fence boards and rails to galvanized posts
Roofing Nails (Clout Nails)
Short nails with disproportionately large flat heads (typically 10–12 mm head diameter) designed for fastening thin, flexible materials without pull-through:
- Roofing felt and membranes — fixing bituminous roof felt, underlay and vapour barriers to timber decking
- Flashings and thin sheet metal — securing lead, zinc and copper flashings
- Insulation boards — temporary fixing of rigid insulation panels before rendering
Technical Specifications
| Nail Type | Diameters | Lengths | Head | Finish |
|---|---|---|---|---|
| Smooth shank | 2.0, 2.5, 2.8, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0 mm | 30, 40, 50, 60, 70, 80, 100, 120, 150, 200 mm | Flat, dia. ~2× shank | Bright or HDG |
| Ring shank | 2.5, 2.8, 3.0, 3.5, 4.0 mm | 40, 50, 60, 65, 70, 75, 80, 90 mm | Flat, dia. ~2× shank | Bright or HDG |
| Roofing nails | 2.5, 3.0, 3.5 mm | 20, 25, 30, 35 mm | Large flat, 10–12 mm dia. | HDG (standard) |
| Property | Specification |
|---|---|
| Material | Low-carbon steel wire (SAE 1006/1008) |
| Galvanizing | Hot-dip galvanized per EN ISO 1461 (galvanized variants) |
| Tensile strength (wire) | 450–600 MPa |
| Bending angle | ≥ 90° without fracture (ductility test) |
| Packaging | 5 kg boxes, 25 kg boxes (palletised) |
| Approximate count (3.0×70 mm) | ~330 nails per kg |
| Approximate count (4.0×100 mm) | ~110 nails per kg |
Standards and Compliance
- EN 14592 — Timber structures — Dowel-type fasteners — Requirements (defines characteristic withdrawal and lateral load capacity for structural nailing)
- EN 1995-1-1 — Eurocode 5 — Design of timber structures (references nail connection design methods)
- EN 10230-1 — Steel wire nails — General requirements and test methods
- DIN EN ISO 1461 — Hot dip galvanized coatings (for galvanized finish variants)
- DIN 1151 — Wire nails (legacy German standard, still commonly referenced in trade)
- DIN 1160 — Roofing nails (legacy German standard)
Bright vs. Galvanized: Selection Guide
Bright (uncoated) nails are suitable for:
- Indoor construction where no moisture exposure occurs
- Temporary formwork (stripped within days/weeks)
- Applications where the nail will be fully embedded in concrete
Hot-dip galvanized nails should be specified for:
- All permanent outdoor timber connections (roofing, cladding, decking, fencing)
- Structural connections per EN 14592 in exposure class 2 and 3
- Agricultural buildings exposed to moisture and animal waste
- Pressure-treated (CCA/ACQ) timber, which accelerates corrosion of uncoated nails
- Coastal and marine-adjacent environments
Important: Never use electro-galvanized (electroplated) nails as a substitute for hot-dip galvanized nails in outdoor applications. The electro-galvanized zinc layer (5–15 µm) provides minimal protection and will fail within 2–5 years outdoors.
Why ULAMEX for Construction Nails
- Three nail types from one supplier — smooth shank, ring shank and roofing nails in one order
- Full size range — 2.0×30 mm to 6.0×200 mm covering every construction application
- Both finishes — bright and hot-dip galvanized from stock
- Sold by weight — 5 kg and 25 kg boxes, palletised for efficient site delivery
- Consistent quality — manufactured from certified wire per EN 10230-1
- EN 1090 certified supply chain — view certifications
- Combine with wire and band irons — add tying wire, galvanized wire and band irons to the same delivery
- European wholesale since 1988 — stock programme serving contractors and distributors across Europe
Frequently Asked Questions
How many nails are in 1 kg?
The number of nails per kilogram depends on the nail size. Approximate counts: 2.5×50 mm ≈ 820/kg, 3.0×70 mm ≈ 330/kg, 3.5×80 mm ≈ 190/kg, 4.0×100 mm ≈ 110/kg, 5.0×120 mm ≈ 55/kg, 6.0×200 mm ≈ 20/kg. These are approximate values for smooth shank nails; ring shank nails weigh slightly more due to the material displaced by the ring forming process.
What is the structural load capacity of a nail connection?
Nail connection capacity is calculated per EN 1995-1-1 (Eurocode 5) using the Johansen yield model. Characteristic values depend on nail diameter, timber density, penetration depth, loading direction and number of shear planes. As a rough guide, a single 3.1×80 mm ring shank nail in C24 timber provides approximately 0.8 kN lateral shear capacity and 0.5 kN withdrawal capacity per EN 14592. Always verify with your structural engineer for project-specific loading.
Can I use galvanized nails with pressure-treated timber?
Yes — in fact, hot-dip galvanized nails are mandatory when using pressure-treated (preservative-treated) timber. The copper-based preservatives (CCA, ACQ, copper azole) used in modern timber treatment are corrosive to plain steel, causing rapid nail failure. Hot-dip galvanized nails resist this chemical attack. For the most aggressive preservative treatments or marine environments, stainless steel nails may be required. Never use bright (uncoated) or electro-galvanized nails with treated timber.
Request a Quote
ULAMEX is your construction nail wholesale partner. From formwork nails to structural ring shank nails and roofing clouts, we supply the full range in bright and galvanized finishes from stock across Europe. Request a quote for your project quantities. Browse our complete wire and band iron catalogue for complementary products.