Trapezoidal Threaded Rods

Trapezoidal Threaded Rods DIN 103 — ACME/Trapezoidal Lead Screws | Tr8–Tr52

Trapezoidal threaded rods manufactured to DIN 103 feature trapezoidal thread profiles (similar to ACME threads) designed for power transmission and linear motion applications. Unlike standard V-threads, trapezoidal threads offer higher load-carrying capacity, reduced friction, and improved wear resistance for screw jacks, actuators, and machine tool lead screws. Available in Tr8 to Tr52 sizes with precision-ground or rolled thread options.

Material & Specifications

Size Range	Tr8 to Tr52 (Tr8, Tr10, Tr12, Tr16, Tr20, Tr24, Tr28, Tr32, Tr40, Tr52)
Standard	DIN 103, ISO 2901/2902, ANSI B1.5 (ACME equivalent)
Material	Carbon Steel (C45), Alloy Steel (42CrMo), 304 SS, Bronze (for nut pairing)
Surface / Coating	Black Oxide, Hardened/Quenched, Electroplated Zinc, Dacromet
Thread Type	Single-start (standard), multi-start (for faster linear speed)
Lead Accuracy	±0.05mm per 300mm (rolled), ±0.02mm per 300mm (ground)

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

• Trapezoidal thread profile offers superior axial load capacity vs. standard V-threads
• Lower friction coefficient for efficient power transmission
• Precision ground threads available for high-accuracy positioning applications
• Multi-start option for increased linear travel per revolution
• Compatible with bronze nuts for low-friction, long-wear sliding assemblies
• Hardened surfaces available for extended wear life in continuous-duty applications

Applications

• Screw jacks and mechanical actuators
• Machine tool lead screws and positioning systems
• Valve stems and gate valve actuators
• Adjustable height columns and lifting platforms
• 3D printer and CNC machine Z-axis drive systems
• Custom linear motion and power transmission assemblies

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