{"title":"Carriage Bolts (DIN 603) - Stainless Steel (A2)","description":"\u003ch1\u003eDIN 603 Carriage Bolt — Stainless Steel A2 (SUS304) | Grade A2-70 | FULLERKREG\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 603 Stainless Steel A2 Carriage Bolts combine the classic round-head square-neck design of DIN 603 with the inherent corrosion resistance of A2 austenitic stainless steel (SUS304). Finished with acid washing and passivation to maximize the natural oxide layer, these bolts deliver a clean, bright appearance and reliable corrosion resistance for indoor, outdoor, food-adjacent, and light marine applications — without any applied coating that can chip, peel, or wear away.\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 A2 Stainless Steel (SUS304 \/ 1.4301)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class \/ Grade:\u003c\/strong\u003e A2-70 (per ISO 3506-1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Finish:\u003c\/strong\u003e Acid Washed + Passivated\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:\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, leaving 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.\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: A2 Stainless Steel (SUS304 \/ 1.4301)\u003c\/h2\u003e\n\u003cp\u003eA2 stainless steel — designated SUS304 in JIS, 1.4301 in EN, and commonly known as 18-8 stainless steel — is the most widely used austenitic stainless steel in the world. Its combination of chromium and nickel content provides excellent corrosion resistance through the formation of a self-repairing passive oxide layer on the surface.\u003c\/p\u003e\n\n\u003ch3\u003eChemical Composition (Typical)\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eElement\u003c\/th\u003e\n      \u003cth\u003eContent (%)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChromium (Cr)\u003c\/td\u003e\n\u003ctd\u003e17.5 – 19.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNickel (Ni)\u003c\/td\u003e\n\u003ctd\u003e8.0 – 10.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCarbon (C)\u003c\/td\u003e\n\u003ctd\u003e≤ 0.07\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eManganese (Mn)\u003c\/td\u003e\n\u003ctd\u003e≤ 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSilicon (Si)\u003c\/td\u003e\n\u003ctd\u003e≤ 1.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePhosphorus (P)\u003c\/td\u003e\n\u003ctd\u003e≤ 0.045\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSulfur (S)\u003c\/td\u003e\n\u003ctd\u003e≤ 0.015\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIron (Fe)\u003c\/td\u003e\n\u003ctd\u003eBalance\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eKey Material Properties\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e Excellent in atmospheric, freshwater, and mild chemical environments. The chromium content forms a self-repairing passive oxide layer (Cr₂O₃) that regenerates when damaged.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-Magnetic:\u003c\/strong\u003e Austenitic structure — non-magnetic in the annealed condition (may become slightly magnetic after cold working)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHygienic:\u003c\/strong\u003e Smooth, non-porous surface — suitable for food-adjacent and pharmaceutical environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Suitable for continuous service from −196°C to +800°C (intermittent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeldability:\u003c\/strong\u003e Excellent — all standard welding methods applicable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWork Hardening:\u003c\/strong\u003e Moderate — cold working increases strength but reduces ductility\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecycling:\u003c\/strong\u003e 100% recyclable — environmentally responsible material choice\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMechanical Properties — Grade A2-70\u003c\/h2\u003e\n\u003cp\u003ePer ISO 3506-1, the grade designation for stainless steel fasteners uses a material class (A2) combined with a minimum tensile strength indicator (70 = 700 MPa). A2-70 is the standard grade for austenitic stainless steel bolts and screws.\u003c\/p\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\u003eA2 Stainless Steel (SUS304 \/ 1.4301)\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProperty Class\u003c\/td\u003e\n      \u003ctd\u003eA2-70\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMinimum Tensile Strength (Rm)\u003c\/td\u003e\n      \u003ctd\u003e≥ 700 MPa\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e0.2% Proof Stress (Rp0.2)\u003c\/td\u003e\n      \u003ctd\u003e≥ 450 MPa\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eElongation after fracture\u003c\/td\u003e\n      \u003ctd\u003e≥ 20%\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHardness (Vickers, max)\u003c\/td\u003e\n      \u003ctd\u003e≤ 250 HV\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSurface Finish\u003c\/td\u003e\n      \u003ctd\u003eAcid Washed + Passivated\u003c\/td\u003e\n      \u003ctd\u003eASTM A967 \/ EN 2516\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n      \u003ctd\u003eInherent — no coating required; self-repairing passive layer\u003c\/td\u003e\n      \u003ctd\u003eISO 3506-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eSurface Finish: Acid Washing + Passivation\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG A2 stainless steel DIN 603 carriage bolts are finished with a two-stage acid washing and passivation process. This is not a coating — it is a surface treatment that enhances the inherent corrosion resistance of the stainless steel itself.\u003c\/p\u003e\n\n\u003ch3\u003eStage 1 — Acid Washing (Pickling)\u003c\/h3\u003e\n\u003cp\u003eThe bolts are immersed in a controlled acid solution (typically a mixture of nitric and hydrofluoric acid) to:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemove heat tint, scale, and oxide discoloration from the manufacturing process\u003c\/li\u003e\n  \u003cli\u003eDissolve any free iron contamination on the surface that could initiate rust spots\u003c\/li\u003e\n  \u003cli\u003eRestore a uniform, bright, clean stainless steel surface\u003c\/li\u003e\n  \u003cli\u003eExpose a fresh, chromium-rich surface layer ready for passivation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eStage 2 — Passivation\u003c\/h3\u003e\n\u003cp\u003eFollowing acid washing, the bolts undergo passivation — a chemical treatment (typically nitric acid or citric acid solution) that:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAccelerates and thickens the natural chromium oxide (Cr₂O₃) passive layer on the surface\u003c\/li\u003e\n  \u003cli\u003eMaximizes the corrosion resistance of the A2 stainless steel\u003c\/li\u003e\n  \u003cli\u003eRemoves any remaining free iron or contaminants that could cause rust staining\u003c\/li\u003e\n  \u003cli\u003eProduces a consistent, bright, silver-white appearance across the entire batch\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eResult\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAppearance:\u003c\/strong\u003e Bright, uniform silver-white — clean and aesthetically superior to unfinished or electroplated fasteners\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Coating Thickness:\u003c\/strong\u003e Zero added coating — thread dimensions remain at nominal tolerance, no oversize tapping required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-Repairing:\u003c\/strong\u003e If the surface is scratched, the passive layer regenerates automatically in the presence of oxygen\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Peeling or Flaking:\u003c\/strong\u003e Unlike zinc coatings, there is no applied layer to chip, peel, or wear away\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFood-Safe:\u003c\/strong\u003e Passivated A2 stainless steel is suitable for food contact applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eCorrosion Resistance: A2 vs Other Finishes\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eFinish \/ Material\u003c\/th\u003e\n      \u003cth\u003eCorrosion Mechanism\u003c\/th\u003e\n      \u003cth\u003eSalt Spray Resistance\u003c\/th\u003e\n      \u003cth\u003eOutdoor Service Life\u003c\/th\u003e\n      \u003cth\u003eSelf-Repairing\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eA2 Stainless (Passivated)\u003c\/td\u003e\n      \u003ctd\u003ePassive Cr₂O₃ layer — inherent\u003c\/td\u003e\n      \u003ctd\u003e≥ 500 hours (no red rust)\u003c\/td\u003e\n      \u003ctd\u003e20–50+ years (atmospheric)\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHot Dip Galvanized (HDG)\u003c\/td\u003e\n      \u003ctd\u003eSacrificial zinc anode\u003c\/td\u003e\n      \u003ctd\u003e≥ 1,000 hours\u003c\/td\u003e\n      \u003ctd\u003e20–50+ years (structural)\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes (zinc)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eZinc CR3 Electroplate\u003c\/td\u003e\n      \u003ctd\u003eBarrier + limited sacrificial\u003c\/td\u003e\n      \u003ctd\u003e24 – 48 hours (Grade 4.8)\u003c\/td\u003e\n      \u003ctd\u003e2 – 5 years (exposed)\u003c\/td\u003e\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePlain Carbon Steel\u003c\/td\u003e\n      \u003ctd\u003eNone — rusts immediately\u003c\/td\u003e\n      \u003ctd\u003e\u0026lt; 24 hours\u003c\/td\u003e\n      \u003ctd\u003eMonths (exposed)\u003c\/td\u003e\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eNote: A2 stainless steel is not suitable for chloride-rich marine environments (seawater, salt spray zones). For marine applications, A4 (SUS316) stainless steel is recommended.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Reference — DIN 603 Key Parameters\u003c\/h2\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 200 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🏗️ Construction \u0026amp; Architectural Timber\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eExposed timber frame connections where aesthetics matter — visible bolt heads in architectural woodwork\u003c\/li\u003e\n  \u003cli\u003eInterior structural timber joints in public buildings, hotels, and retail spaces\u003c\/li\u003e\n  \u003cli\u003eHardwood decking and cladding fastening where staining from carbon steel rust is unacceptable\u003c\/li\u003e\n  \u003cli\u003eStaircase, handrail, and balustrade structural connections\u003c\/li\u003e\n  \u003cli\u003eGlazing and curtain wall timber sub-frame fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🌿 Outdoor \u0026amp; Landscape (Non-Marine)\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGarden furniture, pergolas, and outdoor seating structures\u003c\/li\u003e\n  \u003cli\u003ePlayground equipment in urban and suburban environments\u003c\/li\u003e\n  \u003cli\u003eOutdoor signage and display structure mounting\u003c\/li\u003e\n  \u003cli\u003eFence and gate hardware in residential and commercial settings\u003c\/li\u003e\n  \u003cli\u003eBicycle rack and street furniture fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🍽️ Food, Beverage \u0026amp; Pharmaceutical\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFood processing equipment structural fastening\u003c\/li\u003e\n  \u003cli\u003eCommercial kitchen and catering equipment assembly\u003c\/li\u003e\n  \u003cli\u003eBrewery, winery, and dairy facility structural connections\u003c\/li\u003e\n  \u003cli\u003ePharmaceutical and cleanroom equipment fastening\u003c\/li\u003e\n  \u003cli\u003eCold storage and refrigeration unit structural joints\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🏥 Healthcare \u0026amp; Hygienic Environments\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eHospital and medical facility furniture and equipment fastening\u003c\/li\u003e\n  \u003cli\u003eLaboratory bench and equipment structural connections\u003c\/li\u003e\n  \u003cli\u003eHygienic wall panel and partition fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚡ Electrical \u0026amp; Electronics\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eElectrical enclosure and panel assembly where non-magnetic fasteners are required\u003c\/li\u003e\n  \u003cli\u003eSwitchgear and control cabinet structural fastening\u003c\/li\u003e\n  \u003cli\u003eSolar panel mounting structure connections (non-coastal)\u003c\/li\u003e\n  \u003cli\u003eTelecommunications equipment enclosure 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\u003eInherent Corrosion Resistance — No Coating Required:\u003c\/strong\u003e A2 stainless steel resists corrosion through its passive oxide layer — not through an applied coating. There is nothing to chip, peel, or wear away, making it ideal for applications where coating integrity cannot be guaranteed.\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 with no tool access required on the bolt head side.\u003c\/li\u003e\n  \u003cli\u003e📏 \u003cstrong\u003eBright, Aesthetic Finish:\u003c\/strong\u003e Acid washing and passivation produce a uniform, bright silver-white surface — ideal for visible, architectural, and design-conscious applications where appearance matters.\u003c\/li\u003e\n  \u003cli\u003e🧪 \u003cstrong\u003eNon-Magnetic:\u003c\/strong\u003e Austenitic A2 stainless steel is non-magnetic in the annealed condition — suitable for applications sensitive to magnetic interference.\u003c\/li\u003e\n  \u003cli\u003e♻️ \u003cstrong\u003eEnvironmentally Responsible:\u003c\/strong\u003e No zinc, chromate, or other coating chemicals — 100% recyclable stainless steel with no hazardous surface treatment waste.\u003c\/li\u003e\n  \u003cli\u003e🌡️ \u003cstrong\u003eWide Temperature Range:\u003c\/strong\u003e Suitable from cryogenic temperatures (−196°C) to elevated service temperatures (+800°C intermittent) — far exceeding the range of zinc-coated carbon steel fasteners.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eStandard Thread Fit:\u003c\/strong\u003e No coating thickness — standard-tolerance nuts fit without modification. No oversize tapping required (unlike HDG).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eImportant Limitations — When NOT to Use A2\u003c\/h2\u003e\n\u003cp\u003eA2 stainless steel provides excellent corrosion resistance in most environments, but has known limitations that engineers and specifiers should be aware of:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e⚠️ \u003cstrong\u003eChloride Environments:\u003c\/strong\u003e A2 (SUS304) is susceptible to pitting and crevice corrosion in chloride-rich environments — including seawater, coastal salt spray zones, and de-icing salt exposure. For these applications, A4 (SUS316) stainless steel is required.\u003c\/li\u003e\n  \u003cli\u003e⚠️ \u003cstrong\u003eGalling Risk:\u003c\/strong\u003e Stainless steel fasteners are prone to galling (thread seizure) during tightening, especially at high speeds. Always lubricate threads with an anti-galling compound (e.g., molybdenum disulfide paste or PTFE-based lubricant) before assembly.\u003c\/li\u003e\n  \u003cli\u003e⚠️ \u003cstrong\u003eGalvanic Corrosion:\u003c\/strong\u003e When A2 stainless steel contacts dissimilar metals (e.g., carbon steel, aluminium, copper) in the presence of an electrolyte, galvanic corrosion may occur. Use isolation washers or sleeves where necessary.\u003c\/li\u003e\n  \u003cli\u003e⚠️ \u003cstrong\u003eHigh-Strength Applications:\u003c\/strong\u003e A2-70 (700 MPa) is lower in tensile strength than carbon steel Grade 8.8 (800 MPa) or Grade 10.9 (1040 MPa). For high-strength structural joints, verify that A2-70 meets the required load capacity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLubricate the thread:\u003c\/strong\u003e Apply an anti-galling lubricant (molybdenum disulfide paste, PTFE tape, or anti-seize compound) to the thread before assembly to prevent galling and thread seizure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrepare the substrate:\u003c\/strong\u003e Drill a clearance hole equal to the bolt diameter. For timber, the square neck will self-embed; for metal, punch or drill a square hole matching the neck dimensions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert the bolt:\u003c\/strong\u003e Push the carriage bolt through the hole from the front (visible) face.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmbed the square neck:\u003c\/strong\u003e Tap the bolt head lightly with a mallet to seat the square neck fully into the timber or square hole.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApply washer and nut:\u003c\/strong\u003e Use A2 stainless steel flat washer and hex nut to maintain material compatibility and avoid galvanic corrosion.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTighten from the nut side:\u003c\/strong\u003e Tighten slowly with a wrench — avoid impact tools or high-speed tightening to minimize galling risk. Tighten to the recommended torque for A2-70 and the thread size.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Tightening Torque — A2-70\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\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6.8\u003c\/td\u003e\n\u003ctd\u003e5.1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e16.5\u003c\/td\u003e\n\u003ctd\u003e12.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e33\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003ctd\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e140\u003c\/td\u003e\n\u003ctd\u003e105\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e272\u003c\/td\u003e\n\u003ctd\u003e204\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eTorque values are indicative for A2-70 bolts at 70% proof load with lubricated threads. Always use lubrication with stainless steel fasteners to prevent galling. 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 A2 Stainless DIN 603 Carriage Bolts?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFull DIN 603 \u0026amp; ISO 3506-1 Compliance:\u003c\/strong\u003e Every batch manufactured to DIN 603 dimensional standards and ISO 3506-1 A2-70 mechanical requirements.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eAcid Washed \u0026amp; Passivated:\u003c\/strong\u003e Superior surface finish maximizes the inherent corrosion resistance of A2 stainless steel — bright, clean, and consistent across every batch.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFull Traceability:\u003c\/strong\u003e Material certificates (MTC), mechanical test reports, and chemical composition reports available per shipment.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNo Coating — No Compromise:\u003c\/strong\u003e Inherent stainless steel corrosion resistance — no coating to chip, peel, or fail. Ideal for applications where coating integrity is critical.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWide Size Range:\u003c\/strong\u003e M5 through M20, lengths from 16 mm to 200 mm — covering the full DIN 603 range in stainless steel.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eMatched A2 Nuts \u0026amp; Washers Available:\u003c\/strong\u003e Complete A2 stainless steel fastener sets (bolt + nut + washer) available for simplified procurement and guaranteed material compatibility.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFlexible Packaging:\u003c\/strong\u003e Bulk, box, and custom packaging options available.\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\u003eISO 3506-1\u003c\/strong\u003e — Mechanical properties of corrosion-resistant stainless steel fasteners: bolts, screws and studs (A2-70)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEN 10088-1\u003c\/strong\u003e — Stainless steels — list of stainless steels (1.4301 \/ A2)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eASTM A967 \/ ASTM A380\u003c\/strong\u003e — Standard practice for passivation of stainless steel\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\u003eJIS G4303\u003c\/strong\u003e — Stainless steel bars (SUS304 material standard)\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 A2-70 stainless steel 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., 30 mm, 60 mm, 100 mm)\u003c\/li\u003e\n  \u003cli\u003eFully threaded or partially threaded shank preference\u003c\/li\u003e\n  \u003cli\u003eWhether matched A2 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 (material certificates, mechanical test reports, chemical composition 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 — Precision Stainless Steel Fasteners. Clean, Bright, and Built to Last.\u003c\/em\u003e\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/carriage-bolts-din-603-stainless-steel-a2.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}