Custom U-Bolts

Custom U-Bolts — Drawing-Based U-Bolt Manufacturing | Any Size, Any Shape

Custom U-bolts manufactured to customer drawings and specifications. Whether you need non-standard bend radii, special leg lengths, unusual thread configurations, or unique materials, our custom U-bolt manufacturing service delivers precisely engineered fasteners for your specific application. From prototype to production quantities, we provide full engineering support and material certification.

Material & Specifications

Size Range	M6 to M48 (thread) / any bend shape and dimensions
Standard	Custom per customer drawing — DIN 3570 variants, MSS SP-69 variants
Material	Carbon Steel, Alloy Steel (42CrMo), 304 SS, 316 SS, Duplex SS, Inconel, Titanium
Surface / Coating	Hot-Dip Galvanized (HDG), Dacromet, Multi-Element Alloy, PTFE, Electroplated Zinc
Bend Type	Round, square, semi-round, J-bolt, L-bolt, custom geometry
MOQ	500 pcs (standard), 100 pcs (prototype, surcharge applies)

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

• Full custom manufacturing to customer drawings and specifications
• Wide range of materials including exotic alloys for extreme environments
• Engineering support for bend radius optimization and stress analysis
• Rapid prototyping service available (5-7 day turnaround)
• Full material certification (EN 10204 3.1) and dimensional inspection reports
• Custom packaging and private label options available

Applications

• OEM equipment requiring non-standard U-bolt configurations
• Specialized piping systems with non-standard pipe sizes
• Automotive and trailer custom suspension components
• Marine and offshore custom structural connections
• Architectural and decorative metalwork
• Any application requiring custom-shaped U-bolts

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