{"title":"DIN 603 Carriage Bolt 4.8 Hot Dip Galvanized","description":"\u003ch1\u003eDIN 603 Carriage Bolt — Grade 4.8 | Hot Dip Galvanized | FULLERKREG\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 603 Hot Dip Galvanized Carriage Bolts are engineered for demanding outdoor, structural, and heavy-duty applications where long-term corrosion resistance is critical. The hot dip galvanizing process deposits a thick, metallurgically bonded zinc coating that provides far superior protection compared to electroplated alternatives — making these bolts the preferred choice for timber construction, civil infrastructure, agricultural structures, and any application exposed to moisture, weather, or corrosive environments.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 603\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommon Name:\u003c\/strong\u003e Carriage Bolt \/ Coach Bolt \/ Round Head Square Neck Bolt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Low Carbon Steel Q195\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class \/ Grade:\u003c\/strong\u003e 4.8 (per DIN EN ISO 898-1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Hot Dip Galvanized (HDG)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Metric coarse thread (ISO 68-1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type:\u003c\/strong\u003e Round (domed) head with square neck\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e FULLERKREG\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat Is a DIN 603 Carriage Bolt?\u003c\/h2\u003e\n\u003cp\u003eThe DIN 603 carriage bolt — also known as a coach bolt or round head square neck bolt — is a specialized fastener defined by three key geometric features that make it uniquely suited to timber and structural applications:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmooth Domed Head:\u003c\/strong\u003e The low-profile, rounded head presents a clean, tamper-resistant appearance on the visible face of the joint. No drive recess is present — the bolt is tightened exclusively from the nut side, providing a smooth, snag-free surface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Neck (Collar):\u003c\/strong\u003e Immediately below the head, a short square section embeds into the timber substrate or a pre-punched square hole when the nut is tightened, preventing the bolt from rotating. This enables single-sided tightening with a wrench on the nut alone — no tool required on the bolt head side.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreaded Shank:\u003c\/strong\u003e The shank carries a metric coarse thread accepting a standard hex nut or flange nut. Shorter lengths may be fully threaded; longer lengths feature an unthreaded grip section.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial: Low Carbon Steel Q195\u003c\/h2\u003e\n\u003cp\u003eQ195 is a Chinese national standard (GB\/T 700) low carbon structural steel with excellent cold-forming characteristics, making it the ideal base material for high-volume carriage bolt production. Its low carbon content ensures outstanding ductility and weldability, while providing sufficient strength for Grade 4.8 mechanical requirements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCarbon Content:\u003c\/strong\u003e ≤ 0.12% C (ultra-low carbon, excellent formability)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManganese:\u003c\/strong\u003e 0.25 – 0.50% Mn\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eYield Strength:\u003c\/strong\u003e ≥ 195 MPa\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTensile Strength:\u003c\/strong\u003e 315 – 430 MPa\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElongation:\u003c\/strong\u003e ≥ 33%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeldability:\u003c\/strong\u003e Excellent — suitable for welded structural assemblies\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCold-Heading:\u003c\/strong\u003e Excellent — ideal for high-volume bolt production\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHDG Compatibility:\u003c\/strong\u003e Low carbon content minimizes risk of hydrogen embrittlement and ensures excellent zinc adhesion during galvanizing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMechanical Properties — Grade 4.8\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eStandard Reference\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMaterial\u003c\/td\u003e\n      \u003ctd\u003eLow Carbon Steel Q195\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProperty Class\u003c\/td\u003e\n      \u003ctd\u003e4.8\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNominal Tensile Strength (Rm)\u003c\/td\u003e\n      \u003ctd\u003e≥ 420 MPa\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProof Load Stress (Sp)\u003c\/td\u003e\n      \u003ctd\u003e310 MPa\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYield Strength (Rp0.2)\u003c\/td\u003e\n      \u003ctd\u003e≥ 340 MPa (80% of Rm)\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHardness (Vickers)\u003c\/td\u003e\n      \u003ctd\u003e130 – 220 HV\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eElongation after fracture\u003c\/td\u003e\n      \u003ctd\u003e≥ 14%\u003c\/td\u003e\n      \u003ctd\u003eDIN EN ISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSurface Treatment\u003c\/td\u003e\n      \u003ctd\u003eHot Dip Galvanized (HDG)\u003c\/td\u003e\n      \u003ctd\u003eISO 1461 \/ EN ISO 10684\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eZinc Coating Thickness\u003c\/td\u003e\n      \u003ctd\u003e≥ 45 µm (typical 50 – 85 µm)\u003c\/td\u003e\n      \u003ctd\u003eISO 1461\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCorrosion Resistance (NSS)\u003c\/td\u003e\n      \u003ctd\u003e≥ 1,000 hours neutral salt spray\u003c\/td\u003e\n      \u003ctd\u003eISO 9227\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHot Dip Galvanizing: Process \u0026amp; Performance\u003c\/h2\u003e\n\u003cp\u003eHot dip galvanizing (HDG) is the most robust zinc coating process available for carbon steel fasteners. Unlike electroplating, which deposits a thin zinc layer through electrical current, HDG immerses the cleaned steel in a bath of molten zinc at approximately 450°C, forming a series of zinc-iron alloy layers topped by a pure zinc outer layer. The result is a coating that is metallurgically bonded to the steel — not merely adhered — providing exceptional durability and self-healing properties.\u003c\/p\u003e\n\n\u003ch3\u003eHDG Process Steps\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDegreasing:\u003c\/strong\u003e Removal of oils, grease, and organic contaminants\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePickling:\u003c\/strong\u003e Acid cleaning to remove mill scale and rust\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFluxing:\u003c\/strong\u003e Application of zinc ammonium chloride flux to prevent oxidation before galvanizing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGalvanizing:\u003c\/strong\u003e Immersion in molten zinc bath at ~450°C for controlled dwell time\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuenching \u0026amp; Inspection:\u003c\/strong\u003e Cooling, visual inspection, and coating thickness verification per ISO 1461\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eHDG Coating Structure\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGamma layer (Γ):\u003c\/strong\u003e ~5 µm — zinc-iron alloy (innermost, highest iron content)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDelta layer (δ):\u003c\/strong\u003e ~20 µm — zinc-iron alloy (intermediate)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZeta layer (ζ):\u003c\/strong\u003e ~15 µm — zinc-iron alloy (columnar crystals)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEta layer (η):\u003c\/strong\u003e ~10–20 µm — pure zinc (outermost, provides cathodic protection)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Performance Advantages vs. Electroplating\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eHot Dip Galvanized (HDG)\u003c\/th\u003e\n      \u003cth\u003eZinc Electroplate (CR3)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCoating Thickness\u003c\/td\u003e\n      \u003ctd\u003e45 – 85 µm\u003c\/td\u003e\n      \u003ctd\u003e5 – 12 µm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBond Type\u003c\/td\u003e\n      \u003ctd\u003eMetallurgical (alloy bond)\u003c\/td\u003e\n      \u003ctd\u003eMechanical adhesion\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n      \u003ctd\u003e≥ 1,000 hours\u003c\/td\u003e\n      \u003ctd\u003e24 – 48 hours (Grade 4.8)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOutdoor Service Life\u003c\/td\u003e\n      \u003ctd\u003e20 – 50+ years (rural\/urban)\u003c\/td\u003e\n      \u003ctd\u003e2 – 5 years (exposed)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCathodic Protection\u003c\/td\u003e\n      \u003ctd\u003eYes — sacrificial zinc protects exposed steel\u003c\/td\u003e\n      \u003ctd\u003eLimited\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSelf-Healing\u003c\/td\u003e\n      \u003ctd\u003eYes — zinc oxide\/carbonate forms at scratches\u003c\/td\u003e\n      \u003ctd\u003eNo\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAppearance\u003c\/td\u003e\n      \u003ctd\u003eMatte grey \/ spangled\u003c\/td\u003e\n      \u003ctd\u003eBright silver \/ blue-clear\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eThread Fit\u003c\/td\u003e\n      \u003ctd\u003eRequires oversize tapping (coating adds bulk)\u003c\/td\u003e\n      \u003ctd\u003eStandard thread fit\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBest For\u003c\/td\u003e\n      \u003ctd\u003eOutdoor, structural, heavy-duty\u003c\/td\u003e\n      \u003ctd\u003eIndoor, light-duty, precision fit\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Reference — DIN 603 Key Parameters\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eNote: Hot dip galvanizing adds 45–85 µm of coating per surface. Nuts must be tapped oversize (typically one tolerance class) to accommodate the coating thickness on threaded sections.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread Size\u003c\/th\u003e\n      \u003cth\u003ePitch (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Diameter dk (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Height k (mm)\u003c\/th\u003e\n      \u003cth\u003eSquare Neck Width f (mm)\u003c\/th\u003e\n      \u003cth\u003eSquare Neck Height m (mm)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e3.6\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e4.8\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e26.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e7.2\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e35.0\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e40.0\u003c\/td\u003e\n\u003ctd\u003e9.6\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e9.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e50.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e20.0\u003c\/td\u003e\n\u003ctd\u003e11.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eStandard lengths range from 16 mm to 300 mm depending on thread size. Full dimensional tables per DIN 603. Custom lengths available upon request.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Application Sectors\u003c\/h2\u003e\n\n\u003ch3\u003e🏗️ Structural Timber \u0026amp; Heavy Construction\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eTimber frame and post-and-beam structural connections\u003c\/li\u003e\n  \u003cli\u003eGlulam beam and engineered timber (LVL, CLT) assembly\u003c\/li\u003e\n  \u003cli\u003eBridge decking and boardwalk timber fastening\u003c\/li\u003e\n  \u003cli\u003eRetaining wall timber crib and sleeper connections\u003c\/li\u003e\n  \u003cli\u003eFormwork and falsework structural joints\u003c\/li\u003e\n  \u003cli\u003eScaffold and temporary works connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🌳 Outdoor \u0026amp; Landscape Structures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDecking, pergola, gazebo, and garden structure assembly\u003c\/li\u003e\n  \u003cli\u003eFence post, rail, and gate hardware fastening\u003c\/li\u003e\n  \u003cli\u003eOutdoor furniture — park benches, picnic tables, and seating\u003c\/li\u003e\n  \u003cli\u003ePlayground equipment — climbing frames, swing sets, and slides\u003c\/li\u003e\n  \u003cli\u003eJetty, pontoon, and marine timber structure fastening\u003c\/li\u003e\n  \u003cli\u003eOutdoor signage and display structure mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🌾 Agricultural \u0026amp; Rural Infrastructure\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFarm building and barn structural connections\u003c\/li\u003e\n  \u003cli\u003eLivestock pen, stable, and yard fencing\u003c\/li\u003e\n  \u003cli\u003eGrain store and silo structural fastening\u003c\/li\u003e\n  \u003cli\u003eAgricultural machinery guards and covers\u003c\/li\u003e\n  \u003cli\u003eIrrigation system support structures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚡ Civil \u0026amp; Infrastructure Projects\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRailway sleeper and track infrastructure fastening\u003c\/li\u003e\n  \u003cli\u003eUtility pole and transmission tower base connections\u003c\/li\u003e\n  \u003cli\u003eCoastal and marine infrastructure — piers, jetties, and sea walls\u003c\/li\u003e\n  \u003cli\u003eHighway noise barrier and crash barrier structural joints\u003c\/li\u003e\n  \u003cli\u003eWater treatment and wastewater facility structural fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eKey Features \u0026amp; Design Advantages\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🛡️ \u003cstrong\u003eMaximum Corrosion Protection:\u003c\/strong\u003e HDG zinc coating of 45–85 µm provides decades of outdoor service life — far exceeding electroplated alternatives. Ideal for permanently exposed structural joints.\u003c\/li\u003e\n  \u003cli\u003e🔒 \u003cstrong\u003eAnti-Rotation Square Neck:\u003c\/strong\u003e The square collar embeds into timber or a pre-punched square hole, preventing bolt rotation during nut tightening — enabling single-sided assembly.\u003c\/li\u003e\n  \u003cli\u003e❤️ \u003cstrong\u003eCathodic (Sacrificial) Protection:\u003c\/strong\u003e Even if the zinc coating is scratched or damaged, the surrounding zinc acts as a sacrificial anode, protecting the exposed steel from rusting — a unique self-healing property not available with paint or electroplate.\u003c\/li\u003e\n  \u003cli\u003e📏 \u003cstrong\u003eTamper-Resistant Smooth Head:\u003c\/strong\u003e The domed head has no drive recess, providing a clean appearance and resistance to unauthorized removal without nut-side access.\u003c\/li\u003e\n  \u003cli\u003e⚙️ \u003cstrong\u003eMetallurgical Bond:\u003c\/strong\u003e Unlike adhesive coatings, the HDG zinc-iron alloy layers are bonded at the atomic level — the coating cannot peel, flake, or delaminate under mechanical stress.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eLong Service Life:\u003c\/strong\u003e In rural atmospheric conditions, HDG fasteners typically provide 50+ years of maintenance-free service. In urban or industrial environments, 20–30 years is typical.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eInstallation Notes for HDG Carriage Bolts\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNut Selection:\u003c\/strong\u003e Always use HDG nuts (tapped oversize) with HDG bolts. Standard-tolerance nuts will not fit due to the additional coating thickness on the thread. Specify HDG nuts when ordering.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHole Preparation:\u003c\/strong\u003e Drill clearance holes to the nominal bolt diameter. The HDG coating adds minimal bulk to the shank — standard clearance holes are generally acceptable.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Neck Embedding:\u003c\/strong\u003e Insert the bolt from the front face and tap lightly with a mallet to seat the square neck into the timber. The HDG coating on the square neck provides additional grip in the timber substrate.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWasher Recommendation:\u003c\/strong\u003e Use HDG flat washers under the nut to prevent pull-through in timber and to protect the timber surface from the nut bearing face.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTightening:\u003c\/strong\u003e Tighten from the nut side only. Do not use impact tools at excessive torque — the HDG coating on the thread may be damaged by overtightening.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGalvanic Compatibility:\u003c\/strong\u003e When fastening aluminium or copper components, use isolation washers or sleeves to prevent galvanic corrosion between dissimilar metals.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Tightening Torque — Grade 4.8\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread Size\u003c\/th\u003e\n      \u003cth\u003eTightening Torque (Nm) — Dry\u003c\/th\u003e\n      \u003cth\u003eTightening Torque (Nm) — Lubricated\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e7.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e88\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e172\u003c\/td\u003e\n\u003ctd\u003e129\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eTorque values are indicative for Grade 4.8 bolts at 70% proof load. Always verify with your structural engineer for safety-critical applications.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG HDG DIN 603 Carriage Bolts?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFull DIN 603 \u0026amp; ISO 1461 Compliance:\u003c\/strong\u003e Every batch manufactured to DIN 603 dimensional standards, Grade 4.8 mechanical requirements, and ISO 1461 hot dip galvanizing specifications.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eThick, Durable HDG Coating:\u003c\/strong\u003e Minimum 45 µm zinc coating — providing decades of outdoor corrosion protection far beyond electroplated alternatives.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFull Traceability:\u003c\/strong\u003e Material certificates (MTC), mechanical test reports, coating thickness inspection records, and salt spray test data available per shipment.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHigh-Volume Production Capability:\u003c\/strong\u003e Consistent lot-to-lot quality for construction, civil engineering, and infrastructure procurement programs.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWide Size Range:\u003c\/strong\u003e M5 through M20, lengths from 16 mm to 300 mm — covering the full DIN 603 range.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eMatched HDG Nuts \u0026amp; Washers Available:\u003c\/strong\u003e Complete HDG fastener sets (bolt + nut + washer) available for simplified procurement.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFlexible Packaging:\u003c\/strong\u003e Bulk, box, and pallet options available to suit construction site and project requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplicable Standards \u0026amp; References\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 603\u003c\/strong\u003e — Round head square neck bolts (metric coarse thread)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN EN ISO 898-1\u003c\/strong\u003e — Mechanical properties of fasteners: bolts, screws and studs (property class 4.8)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 1461\u003c\/strong\u003e — Hot dip galvanized coatings on fabricated iron and steel articles — specifications and test methods\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEN ISO 10684\u003c\/strong\u003e — Fasteners — hot dip galvanized coatings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 9227\u003c\/strong\u003e — Corrosion tests in artificial atmospheres — neutral salt spray (NSS) test\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGB\/T 700\u003c\/strong\u003e — Carbon structural steels (Q195 material standard)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 4014 \/ ISO 4016\u003c\/strong\u003e — Hexagon head bolts (referenced for thread and shank geometry)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eOrdering \u0026amp; Customization\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG supplies DIN 603 Grade 4.8 Hot Dip Galvanized carriage bolts in standard and custom configurations. Please specify the following when placing an inquiry:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread diameter and pitch (e.g., M8 × 1.25, M12 × 1.75)\u003c\/li\u003e\n  \u003cli\u003eNominal length (e.g., 40 mm, 80 mm, 150 mm)\u003c\/li\u003e\n  \u003cli\u003eFully threaded or partially threaded shank preference\u003c\/li\u003e\n  \u003cli\u003eWhether matched HDG nuts and washers are required\u003c\/li\u003e\n  \u003cli\u003eRequired quantity and packaging format (bulk \/ box \/ pallet)\u003c\/li\u003e\n  \u003cli\u003eCertification requirements (ISO 1461 coating reports, material certificates, mechanical test reports)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eContact our technical sales team for datasheets, samples, and volume pricing.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cem\u003eFULLERKREG — Reliable Fasteners Built to Last. Hot Dip Galvanized for Decades of Outdoor Performance.\u003c\/em\u003e\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-603-carriage-bolt-4-8-hot-dip-galvanized.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}