Tie Rods

Tie Rods — Formwork Tie Rods for Construction | M12–M20 | Reusable Concrete Formwork

Construction tie rods are threaded steel rods designed for formwork and concrete placement applications. These reusable rods serve as through-ties connecting formwork panels, resisting the hydrostatic pressure of fresh concrete during placement and curing. Available in M12 to M20 sizes with various lengths and配套 wing nuts and washers.

Material & Specifications

Size Range	M12 to M20 (thread) / custom lengths 1m to 6m
Standard	DIN 975 (thread), custom formwork specifications
Material	Carbon Steel (Grade 4.6/4.8), Galvanized Carbon Steel
Surface / Coating	Black/Plain, Hot-Dip Galvanized, Electroplated Zinc
Tensile Strength	≥ 400 MPa (Grade 4.6)
Accessories	Wing nuts, flat washers, water stop discs

Surface Treatment & Zinc Coating Quality

At BoltNutsPlus, we understand that surface treatment is critical to fastener longevity and performance. Our products undergo rigorous coating processes to ensure maximum corrosion resistance and durability. We offer five premium coating options, each tested to international standards:

• Hot-Dip Galvanizing (HDG) — Thick zinc layer (50-120μm) providing superior long-term corrosion protection for outdoor, marine, and industrial environments. Compliant with ISO 1461 / ASTM A153 standards. Salt spray resistance: 500-1,000+ hours. Ideal for structural steel assemblies exposed to harsh weather.
• Electroplated Zinc Blue-White (Zn Blue/White) — Bright, clean silver-blue appearance with 5-15μm zinc layer. Cr3+ passivation technology, fully RoHS compliant. Ideal for indoor machinery, electronics, and general-purpose applications requiring aesthetic appeal and moderate corrosion resistance.
• Color Zinc / Yellow Zinc (Iridescent Passivation) — Multi-colored iridescent passivation film offering enhanced corrosion resistance (100-200 hours salt spray) with a distinctive golden finish. Widely preferred in automotive, agricultural equipment, and construction machinery sectors for its balanced protection and visual appeal.
• Dacromet Coating — Advanced water-based zinc-chromium coating technology with NO hydrogen embrittlement risk. Provides 1,000+ hours salt spray resistance, making it the preferred choice for high-strength fasteners in extreme environments. Environmentally friendly (no heavy metal discharge), RoHS/ELV compliant, ideal for automotive and wind energy applications.
• Multi-Element Alloy Co-Permeation — Zinc-aluminum-rare earth alloy layer offering 2-3x the corrosion resistance of traditional galvanizing. Features self-healing properties at scratch points, ensuring long-term protection even in damaged areas. Ideal for critical infrastructure, power transmission towers, coastal projects, and marine installations.

Key Features

• Reusable design reduces formwork cost per pour cycle
• Full-length threading allows adjustable formwork panel spacing
• Galvanized finish provides corrosion resistance for repeated outdoor use
• High tensile strength resists concrete hydrostatic pressure during placement
• Compatible with standard wing nuts and formwork hardware
• Custom lengths available for various wall thicknesses

Applications

• Concrete formwork panel connection and tie
• Bridge pier and abutment formwork
• Retaining wall and basement wall formwork
• Column and beam formwork systems
• Water tank and silo construction formwork
• General concrete placement requiring through-tie formwork

Why Choose BoltNutsPlus?

• ISO 9001:2015 Certified Manufacturing — consistent quality you can trust on every batch
• 15+ Years of Export Experience — serving 40+ countries across 6 continents
• Full Traceability — material certificates (EN 10204 3.1) and comprehensive test reports included
• Custom Packaging & OEM/ODM — your brand identity, your specifications, our precision manufacturing
• Third-Party SGS / Bureau Veritas Inspection Available upon request
• 24-Hour Quote Response — same-day reply for urgent requirements; standard 24-hour turnaround