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FULLERKREG DIN 433 small outer diameter flat washers are manufactured to DIN 433 / ISO 7092 standards in H59 brass (approximately 59% copper, 41% zinc) with a natural cleaned finish. H59 is the most widely used and cost-effective standard brass alloy, offering an excellent balance of mechanical strength, machinability, and corrosion resistance. These washers are ideal for plumbing, electrical, decorative hardware, and precision instrument applications where a non-ferrous, corrosion-resistant fastener is required.
All dimensions in millimeters (mm). Tolerances per DIN 433 / ISO 7092.
| Nominal Size (d) | Inner Dia. d1 (min) | Inner Dia. d1 (max) | Outer Dia. d2 (max) | Thickness h (min) | Thickness h (max) |
|---|---|---|---|---|---|
| M1.6 | 1.7 | 1.84 | 3.5 | 0.25 | 0.35 |
| M2 | 2.1 | 2.24 | 4.5 | 0.25 | 0.35 |
| M2.5 | 2.6 | 2.74 | 5.0 | 0.35 | 0.45 |
| M3 | 3.1 | 3.28 | 6.0 | 0.45 | 0.55 |
| M3.5 | 3.6 | 3.78 | 7.0 | 0.45 | 0.55 |
| M4 | 4.1 | 4.28 | 8.0 | 0.55 | 0.70 |
| M5 | 5.1 | 5.28 | 9.0 | 0.55 | 0.70 |
| M6 | 6.1 | 6.28 | 11.0 | 0.8 | 1.0 |
| M8 | 8.1 | 8.28 | 15.0 | 1.1 | 1.4 |
| M10 | 10.1 | 10.28 | 18.0 | 1.6 | 2.0 |
| M12 | 12.1 | 12.28 | 20.0 | 1.6 | 2.0 |
| M14 | 14.1 | 14.28 | 24.0 | 1.6 | 2.0 |
| M16 | 16.1 | 16.28 | 28.0 | 1.6 | 2.0 |
| M20 | 20.1 | 20.28 | 34.0 | 2.0 | 2.5 |
| M24 | 24.1 | 24.28 | 39.0 | 2.5 | 3.0 |
* All dimensions conform to DIN 433 / ISO 7092. Please verify with your engineering team for critical applications.
H59 is the most widely used and cost-effective standard brass, containing approximately 59% copper and 41% zinc. It is a leaded, free-machining brass that offers an excellent balance of mechanical properties, machinability, and affordability. It is extensively used in machinery, hardware, plumbing fixtures, and electrical components.
| Property | Value |
|---|---|
| Material Grade | Brass H59 (GB/T 5231) |
| Copper (Cu) Content | ≈57 – 60% |
| Zinc (Zn) Content | Balance (≈40 – 43%) |
| Lead (Pb) Content | ≤ 1.0% (free-machining grade) |
| Density | 8.5 g/cm³ |
| Tensile Strength | ≥ 390 MPa |
| Yield Strength | ≥ 150 MPa |
| Elongation | ≥ 20% |
| Hardness (HB) | 80 – 120 HB |
| Electrical Conductivity | ≈26% IACS |
| Thermal Conductivity | ≈87 W/(m·K) |
| Melting Point | ≈885 – 895°C |
| Operating Temperature | -40°C to +150°C |
| Element | Cu | Zn | Pb (max) | Fe (max) | Others (max) |
|---|---|---|---|---|---|
| Content (%) | 57.0 – 60.0 | Balance | 1.0 | 0.5 | 0.5 |
These washers are supplied in a natural, cleaned bare brass finish — no electroplating, no coating. The surface is cleaned and degreased after manufacturing to reveal the characteristic warm golden-yellow color of H59 brass. Key notes:
Real product images — FULLERKREG DIN 433 Small O.D. Flat Washer, Brass H59 Natural finish:
| [ Photo 1 ] | [ Photo 2 ] | [ Photo 3 ] | [ Photo 4 ] |
| Size | Standard Pack (pcs) | Bulk Carton (pcs) | Weight per 1000 pcs (approx.) |
|---|---|---|---|
| M3 | 200 | 10,000 | ~0.22 kg |
| M4 | 200 | 5,000 | ~0.43 kg |
| M5 | 100 | 3,000 | ~0.68 kg |
| M6 | 100 | 2,000 | ~1.35 kg |
| M8 | 50 | 1,000 | ~3.40 kg |
| M10 | 50 | 500 | ~6.70 kg |
| M12 | 25 | 500 | ~8.80 kg |
* Brass density ≈8.5 g/cm³ (vs. steel ≈7.85 g/cm³) — brass washers are approximately 8% heavier than equivalent steel washers. Custom packaging and labeling available for OEM / wholesale orders. Contact FULLERKREG for bulk pricing.
Q: What is the difference between DIN 433 and DIN 125 brass washers?
A: DIN 433 has a smaller outer diameter than DIN 125, designed specifically for use with pan head and cheese head screws where the washer must fit within the head recess area. DIN 125 is the standard flat washer for general-purpose use.
Q: Why choose brass over steel for DIN 433 washers?
A: Brass offers superior corrosion resistance in fresh water and atmospheric environments, is non-magnetic and non-sparking, and provides an attractive golden appearance. It is preferred in plumbing, electrical, and decorative applications where steel would corrode or cause galvanic issues.
Q: Is H59 brass suitable for marine or seawater applications?
A: H59 brass is not recommended for seawater or highly corrosive environments due to its susceptibility to dezincification. For marine applications, consider higher-grade brass (H62, H65) or copper-nickel alloys.
Q: Will the brass washers tarnish or change color over time?
A: Yes. Natural brass develops a patina over time in ambient conditions. This is a normal characteristic of bare brass. If a consistently bright finish is required, apply a clear lacquer coating after installation.
Q: Are these washers RoHS compliant?
A: Yes. FULLERKREG H59 brass washers are RoHS and REACH compliant. Full compliance documentation is available upon request.
Q: Can I order mixed sizes in one shipment?
A: Yes. FULLERKREG supports mixed-size wholesale orders. Please contact us with your size breakdown and quantities for a custom quotation.
Q: Do you provide material test certificates?
A: Yes. Mill certificates, chemical composition reports, and dimensional inspection reports are available for all orders upon request.
FULLERKREG Fasteners — Precision DIN Standard Fasteners, Direct from Manufacturer.
For wholesale inquiries, technical questions, or custom orders, please contact our sales team.
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