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FULLERKREG DIN 125A brass flat washers are manufactured from H59 brass (approximately 59% copper, 41% zinc) with a natural (as-machined / bright) finish. Conforming to DIN 125A, ISO 7089, and GB/T 97.1, these washers combine the corrosion resistance, electrical conductivity, and non-magnetic properties of brass with the standard DIN 125A flat washer geometry — making them the preferred choice for electrical, plumbing, instrumentation, and decorative fastening applications where carbon steel or stainless steel is unsuitable.
H59 is the most widely used and cost-effective standard brass in China, offering an excellent balance of mechanical properties, machinability, and affordability. It is extensively used in machinery, hardware, plumbing fixtures, and electrical components. The natural brass finish provides a warm golden appearance that is suitable for decorative and visible fastening applications.
| Standard | DIN 125A ≡ ISO 7089 ≡ GB/T 97.1 |
| Type | Plain flat washer — normal series (Form A), chamfer on one side of inner hole |
| Material | Brass H59 (Cu: 57–60%, Zn: Balance, Fe ≤ 0.3%, Pb ≤ 0.5%) |
| Surface Finish | Natural finish (bright / as-stamped) |
| Size Range | M3 – M20 |
| Hardness | ~120–150 HV (typical for H59 brass) |
| Magnetic | Non-magnetic |
| Electrical Conductivity | ~27.5% IACS |
| Corrosion Resistance | Good in atmospheric, fresh water, and ambient environments; not recommended for seawater or strong acids |
| Recommended Pairing | Brass bolts and nuts for full material compatibility; also compatible with stainless steel fasteners |
| Related Standard | ISO 7089 | GB/T 97.1 | GB/T 5231 (H59 brass material standard) |
| [Product Photo 1] | [Product Photo 2] | [Product Photo 3] | [Product Photo 4] |
All dimensions in millimeters (mm). Data per DIN 125A / ISO 7089 standard.
| Nominal Size (Bolt d) | d1 — Inner Ø (mm) | d2 — Outer Ø (mm) | h — Thickness (mm) | Weight (kg / 1000 pcs) |
|---|---|---|---|---|
| M3 | 3.2 | 7 | 0.5 | 0.08 |
| M4 | 4.3 | 9 | 0.8 | 0.21 |
| M5 | 5.3 | 10 | 1.0 | 0.31 |
| M6 | 6.4 | 12 | 1.6 | 0.77 |
| M8 | 8.4 | 16 | 1.6 | 1.37 |
| M10 | 10.5 | 20 | 2.0 | 2.68 |
| M12 | 13.0 | 24 | 2.5 | 5.35 |
| M14 | 15.0 | 28 | 2.5 | 7.28 |
| M16 | 17.0 | 30 | 3.0 | 10.76 |
| M18 | 19.0 | 34 | 3.0 | 14.15 |
| M20 | 21.0 | 37 | 3.0 | 16.99 |
* d1 = inner diameter (clearance hole); d2 = outer diameter; h = nominal thickness. All dimensions per DIN 125A / ISO 7089. Weights are approximate based on H59 brass density (8.5 g/cm³).
Per GB/T 5231 H59 brass standard. The sum of Cu and all listed elements is ≥ 99.8%.
| Element | Cu (Copper) | Fe (Iron) | Pb (Lead) | Zn (Zinc) |
|---|---|---|---|---|
| Min. | 57% | — | — | Balance |
| Max. | 60% | 0.3% | 0.5% | Balance |
* Iron content in non-magnetic brass applications: ≤ 0.03%. H59 is a leaded free-machining brass. The lead content (≤ 0.5%) improves machinability. Note: H59 may not comply with RoHS Directive (Pb restriction ≤ 0.1%) — specify lead-free brass (e.g. H62 or HPb59-1 alternatives) for RoHS-sensitive applications.
| Property | Value |
|---|---|
| Density | 8.5 g/cm³ |
| Melting Range | 880 – 900°C (solidus to liquidus) |
| Specific Heat Capacity | 0.385 kJ/(kg·°C) |
| Thermal Conductivity | ~120 W/(m·K) |
| Coefficient of Linear Expansion (20–200°C) | ~20.6 × 10⁻⁶ /°C |
| Electrical Resistivity (20°C) | ~0.062 μΩ·m |
| Electrical Conductivity | ~27.5% IACS |
| Elastic Modulus | ~105 GPa |
| Magnetic Properties | Non-magnetic |
| Hardness (typical) | ~120–150 HV (annealed to half-hard) |
| Tensile Strength (annealed) | ~390–440 MPa |
| Hot Workability | Excellent — suitable for hot forging, hot extrusion, and hot rolling |
| Cold Workability | Moderate — cold bending and cold heading feasible; complex cold forming requires intermediate annealing |
| Machinability | Good — free-machining brass (Pb content improves chip breaking) |
| Welding & Brazing | Good |
| Corrosion Resistance | Good in atmospheric, fresh water, and ambient environments; fair in seawater, strong acids, or prolonged humid conditions (susceptible to dezincification) |
| Property | Brass H59 (This Product) | A2 Stainless (SUS304) | Carbon Steel Q235 |
|---|---|---|---|
| Magnetic | Non-magnetic | Slightly magnetic | Magnetic |
| Electrical conductivity | ~27.5% IACS — Good | ~2.5% IACS — Poor | ~17% IACS — Moderate |
| Thermal conductivity | ~120 W/(m·K) — Good | ~16 W/(m·K) — Low | ~50 W/(m·K) — Moderate |
| Corrosion resistance | Good (atmospheric & fresh water) | Excellent | Poor (requires coating) |
| Appearance | Warm golden — decorative | Silver — clean | Depends on coating |
| Density | 8.5 g/cm³ | 7.93 g/cm³ | 7.85 g/cm³ |
| Cost | Medium-high (Cu content) | Medium | Low |
| Best for | Electrical, plumbing, non-magnetic, decorative | Corrosive environments, food-grade | General construction (with coating) |
Q: What is H59 brass?
A: H59 is a Chinese national standard (GB/T 5231) designation for a leaded alpha-beta brass containing approximately 57–60% copper and 41% zinc, with small additions of iron (≤ 0.3%) and lead (≤ 0.5%). It is the most widely used and cost-effective standard brass in China, offering an excellent balance of mechanical properties, machinability, and affordability. The lead content improves machinability (free-machining brass). H59 is equivalent to CuZn40Pb (DIN/EN) and approximately C28000 (ASTM).
Q: Are brass washers non-magnetic?
A: Yes. H59 brass is non-magnetic (magnetic permeability ≈1). This makes brass washers the preferred choice for applications where magnetic interference must be avoided, such as electrical equipment, sensitive instruments, MRI-adjacent environments, and precision measurement devices. Note: for non-magnetic applications, specify iron content ≤ 0.03% — contact FULLERKREG if this is a requirement.
Q: Can I use brass washers in outdoor or marine environments?
A: H59 brass provides good corrosion resistance in atmospheric conditions and fresh water. However, it is susceptible to dezincification (selective leaching of zinc) in seawater, strong acids, and prolonged humid or corrosive conditions. For marine or outdoor structural applications, A4 stainless steel (SUS316) washers are recommended. Brass is suitable for above-waterline marine hardware in low-salinity environments.
Q: Is H59 brass RoHS compliant?
A: H59 brass contains up to 0.5% lead (Pb), which exceeds the RoHS Directive limit of 0.1% Pb for homogeneous materials in electrical and electronic equipment. H59 brass washers are therefore not RoHS compliant for use in electrical and electronic equipment subject to the EU RoHS Directive. For RoHS-sensitive applications, specify lead-free brass alternatives. Contact FULLERKREG for lead-free brass washer availability.
Q: What is the difference between DIN 125A and ISO 7089 for brass washers?
A: DIN 125A and ISO 7089 are equivalent standards with identical dimensions. The material and hardness requirements differ: ISO 7089 specifies a maximum hardness of 200 HV for normal washers. H59 brass washers typically fall within this range (~120–150 HV). 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.
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