{"title":"DIN 125A \/ ISO 7089 \/ GB\/T 97.1 Flat Washers — 140HV Carbon Steel Q235, Black Oxide","description":"\u003ch1\u003eDIN 125A \/ ISO 7089 \/ GB\/T 97.1 Flat Washers — 140HV Carbon Steel Q235, Black Oxide\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 125A 140HV flat washers are manufactured from carbon steel Q235 (mild steel, equivalent to S235 \/ A36) with a black oxide surface finish. Conforming to DIN 125A, ISO 7089, and GB\/T 97.1, these general-purpose washers distribute bolt and nut bearing loads over a larger surface area, protect the joint surface from damage during tightening, and provide a cost-effective bearing face for general fastening applications with low to medium strength bolts.\u003c\/p\u003e\n\n\u003cp\u003eQ235 carbon steel provides good weldability, machinability, and formability at low cost, making these washers the standard choice for general construction, fabrication, and industrial assembly applications where corrosion resistance is not a primary requirement. The black oxide finish provides a clean appearance and an oil-retentive surface for indoor and protected environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e 140HV soft washers are suitable for use with Grade 4.6, 4.8, 5.6, and 6.8 bolts. For Grade 8.8, 10.9, or 12.9 high-tensile bolts, specify FULLERKREG 300HV hardened washers to prevent embedding and preload loss.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN 125A ≡ ISO 7089 ≡ GB\/T 97.1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlain flat washer — normal series (Form A), chamfer on one side of inner hole\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel Q235 (S235 \/ A36 \/ mild steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeat Treatment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone — as-stamped (cold formed)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHardness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~140 HV (typical for Q235 mild steel, ≤ 200 HV per ISO 7089 normal grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack Oxide (Blackened)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM3 – M36\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Bolt Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGrade 4.6, 4.8, 5.6, 6.8 (low to medium strength bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorrosion Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMinimal — black oxide provides light protection; apply oil for storage and indoor service\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMagnetic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelated Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eISO 7089 (normal washer, 200 HV grade)  |  GB\/T 97.1  |  DIN 125B (ISO 7090, double chamfer)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensions — DIN 125A \/ ISO 7089 \/ GB\/T 97.1\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 125A \/ ISO 7089 standard.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eNominal Size (Bolt d)\u003c\/th\u003e\n      \u003cth\u003ed1 — Inner Ø (mm)\u003c\/th\u003e\n      \u003cth\u003ed2 — Outer Ø (mm)\u003c\/th\u003e\n      \u003cth\u003eh — Thickness (mm)\u003c\/th\u003e\n      \u003cth\u003eWeight (kg \/ 1000 pcs)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.06\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e0.18\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e0.27\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e0.68\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.21\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.37\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e4.73\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e6.43\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e8.98\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM18\u003c\/td\u003e\n\u003ctd\u003e19.0\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e11.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e37\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e14.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM22\u003c\/td\u003e\n\u003ctd\u003e23.0\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e15.6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e25.0\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e27.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e35.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e31.0\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e45.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM33\u003c\/td\u003e\n\u003ctd\u003e34.0\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e64.3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e37.0\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e83.2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* d1 = inner diameter (clearance hole); d2 = outer diameter; h = nominal thickness. All dimensions per DIN 125A \/ ISO 7089. Weights are approximate based on carbon steel density (7.85 g\/cm³).\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWasher Grade Selection Guide — Matching Washer to Bolt Grade\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBolt Property Class\u003c\/th\u003e\n      \u003cth\u003eRecommended Washer Grade\u003c\/th\u003e\n      \u003cth\u003eWasher Hardness\u003c\/th\u003e\n      \u003cth\u003eFULLERKREG Product\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e4.6 \/ 4.8 \/ 5.6 \/ 6.8\u003c\/td\u003e\n\u003ctd\u003eNormal (200 HV)\u003c\/td\u003e\n\u003ctd\u003e~140 HV Q235\u003c\/td\u003e\n\u003ctd\u003eThis product — DIN 125A 140HV Black\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003eNormal or Hardened (200–300 HV)\u003c\/td\u003e\n\u003ctd\u003e300 HV recommended\u003c\/td\u003e\n\u003ctd\u003eDIN 125A 300HV Black \/ Zinc CR3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e10.9\u003c\/td\u003e\n\u003ctd\u003eHardened (300 HV minimum)\u003c\/td\u003e\n\u003ctd\u003e300 – 370 HV\u003c\/td\u003e\n\u003ctd\u003eDIN 125A 300HV Black \/ Zinc CR3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e12.9\u003c\/td\u003e\n\u003ctd\u003eHardened (300 HV minimum)\u003c\/td\u003e\n\u003ctd\u003e300 – 370 HV\u003c\/td\u003e\n\u003ctd\u003eDIN 125A 300HV Black \/ Zinc CR3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eA2-70 \/ A4-70 (stainless)\u003c\/td\u003e\n\u003ctd\u003eA2 \/ A4 stainless (≤ 200 HV)\u003c\/td\u003e\n\u003ctd\u003e≤ 200 HV\u003c\/td\u003e\n\u003ctd\u003eDIN 125A A2 \/ A4 Stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBase Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel Q235 (S235 \/ A36 \/ mild steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCarbon Content\u003c\/td\u003e\n\u003ctd\u003e≤ 0.22% (low carbon, mild steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength\u003c\/td\u003e\n\u003ctd\u003e≥ 235 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e370 – 500 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Treatment\u003c\/td\u003e\n\u003ctd\u003eNone — as-stamped (cold formed)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e~140 HV (typical; ≤ 200 HV per ISO 7089 normal grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eBlack Oxide (alkaline blackening) — 1–2 μm, oil-retentive\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eMinimal — oil or grease recommended for storage and service\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Limit\u003c\/td\u003e\n\u003ctd\u003eUp to +150°C (black oxide service limit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003e7.85 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eManufacturing Process\u003c\/td\u003e\n\u003ctd\u003eCold stamped from Q235 mild steel strip\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeldability\u003c\/td\u003e\n\u003ctd\u003eExcellent (low carbon content)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏗️ \u003cstrong\u003eGeneral construction \u0026amp; fabrication\u003c\/strong\u003e — standard flat washers for structural connections with Grade 4.6 \/ 4.8 bolts in general building and fabrication work\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eGeneral mechanical assembly\u003c\/strong\u003e — load distribution and surface protection in general-purpose bolted joints in machinery, equipment, and fixtures\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eIndustrial plant — indoor equipment\u003c\/strong\u003e — general fastening in indoor industrial environments where corrosion is not a concern\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eFurniture \u0026amp; shelving\u003c\/strong\u003e — flat washers for furniture assembly, shelving systems, and light structural applications\u003c\/li\u003e\n  \u003cli\u003e🛠️ \u003cstrong\u003eMaintenance \u0026amp; repair\u003c\/strong\u003e — general-purpose replacement washers for maintenance, repair, and overhaul (MRO) applications\u003c\/li\u003e\n  \u003cli\u003e🏠 \u003cstrong\u003eLight construction\u003c\/strong\u003e — timber framing, light steel framing, and general construction fastening with low-strength bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is Q235 carbon steel?\u003c\/strong\u003e\u003cbr\u003e\nA: Q235 is a Chinese national standard (GB\/T 700) designation for a low-carbon mild steel with a minimum yield strength of 235 MPa. It is equivalent to S235 (EN 10025, European standard) and approximately equivalent to ASTM A36 (US standard). Q235 is widely used for general structural and fabrication applications due to its good weldability, formability, and low cost. It is not suitable for heat treatment to high hardness levels — for hardened washers, FULLERKREG uses carbon steel 45# (C45).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use 140HV soft washers with Grade 8.8 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: For non-critical, low-load applications with Grade 8.8 bolts, 140HV soft washers may be acceptable. However, for structural, high-load, or precision applications with Grade 8.8 bolts, 300HV hardened washers are strongly recommended to prevent embedding and preload loss. For Grade 10.9 and 12.9 bolts, 300HV hardened washers are mandatory.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does black oxide provide corrosion protection?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide provides only minimal corrosion protection (1–2 μm conversion coating). It is primarily used for appearance and to provide an oil-retentive surface that slows surface oxidation. Always apply a light oil or anti-corrosion grease to black oxide washers during storage and installation. Do not use in outdoor, marine, or corrosive environments without additional protection. For outdoor use, specify Zinc CR3 or hot dip galvanised washers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between DIN 125A 140HV Black and DIN 125A 300HV Black?\u003c\/strong\u003e\u003cbr\u003e\nA: Both products have identical DIN 125A dimensions and black oxide surface finish. The key difference is hardness and base material: 140HV uses Q235 mild steel (as-stamped, no heat treatment) suitable for low-strength bolts; 300HV uses carbon steel 45# with quench and temper heat treatment, suitable for Grade 8.8\/10.9\/12.9 high-tensile bolts. Always match the washer hardness grade to the bolt property class.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between DIN 125A and ISO 7089?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 125A and ISO 7089 are equivalent standards with identical dimensions. ISO 7089 additionally defines two hardness grades: 200 HV (normal — this product falls within this grade) and 300 HV (hardened). DIN 125A is the German national standard; ISO 7089 is the international equivalent. GB\/T 97.1 is the Chinese national standard with the same dimensions.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-125a-iso-7089-gb-t-97-1-flat-washer-140hv-zinc-black.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}