Full Thread Hex Bolts

Full Thread Hex Bolts — DIN 933 / ISO 4017 | Fully Threaded Hexagon Head Bolts | M3–M64

Full thread hex bolts, manufactured to DIN 933 and ISO 4017 standards, feature complete threading along the entire shank length. This design provides maximum nut engagement and grip length flexibility, making them ideal for applications requiring full-strength threading through mating components. Available in M3 to M64 sizes with carbon steel, stainless steel, and alloy steel options, our fully threaded hex bolts are precision-forged and thread-rolled for superior tensile strength and fatigue resistance.

Material & Specifications

Size Range	M3 to M64 / 1/8″ to 2-1/2″
Standard	DIN 933, ISO 4017, ANSI B18.2.1, GB/T 5783
Material	Carbon Steel (4.8, 8.8, 10.9, 12.9), 304 SS (A2-70), 316 SS (A4-80), Alloy Steel
Surface / Coating	Hot-Dip Galvanized (HDG), Electroplated Zinc Blue/White, Color Zinc, Dacromet, Multi-Element Alloy Co-Permeation
Tensile Strength	400-1220 MPa (varies by grade)
Thread Type	Metric coarse (standard), metric fine (on request), UNC/UNF (on request)

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-length threading allows flexible positioning and maximum nut engagement
• Hexagonal head provides excellent wrenching surface for high-torque applications
• Thread-rolled for superior fatigue strength and surface finish
• Cold-forged heads ensure grain flow continuity for maximum strength
• Available in all strength grades from 4.8 to 12.9 for diverse load requirements
• Full traceability with heat numbers and material certificates (EN 10204 3.1)

Applications

• Structural steel connections and general construction assemblies
• Machinery and equipment manufacturing requiring full thread engagement
• Automotive, truck, and trailer chassis fastening
• Piping flange connections and pressure vessel assembly
• Agricultural and construction equipment manufacturing
• Maintenance, repair, and operations (MRO) applications

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