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FULLERKREG DIN 439 thin hexagon nuts in brass (HPb56-4 free-cutting brass) combine excellent machinability, good electrical conductivity, and natural corrosion resistance in a compact, reduced-height jam nut profile. Manufactured to DIN 439 / ISO 4035 standards, these brass thin nuts are widely used in electrical assemblies, instrumentation, plumbing fittings, and precision mechanical applications where non-magnetic, non-sparking, or conductive fasteners are required. Available in natural brass finish and whitened (bright) finish.
| Attribute | Details |
|---|---|
| Standard | DIN 439 / ISO 4035 |
| Type | Thin Hexagon Nut (Jam Nut / Half Nut) |
| Material | Brass HPb56-4 (Free-Cutting Leaded Brass) |
| Surface Treatment | Natural Brass Finish / Whitened (Bright) Finish |
| Size Range | M3 – M16 |
| Thread | Metric Coarse Thread (per ISO 261) |
| Key Properties | Non-magnetic, non-sparking, electrically conductive, excellent machinability |
| RoHS Note | HPb56-4 contains lead (Pb ~3.5–4.5%); confirm RoHS exemption applicability for your end use |
Width Across Flats (s), Width Across Corners (e), Nut Height (m) — per DIN 439B standard. Unit weight (g) is theoretical reference value for HPb56-4 brass (density 8.50 g/cm³).
| Thread Size | Pitch (mm) | s max (mm) | s min (mm) | e min (mm) | m max (mm) | m min (mm) | Unit Weight (g/pc) |
|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.50 | 5.30 | 6.01 | 1.80 | 1.55 | 0.37 |
| M3.5 | 0.6 | 6.00 | 5.80 | 6.01 | 2.00 | 1.75 | 0.47 |
| M4 | 0.7 | 7.00 | 6.78 | 7.66 | 2.20 | 1.95 | 0.77 |
| M5 | 0.8 | 8.00 | 7.78 | 8.79 | 2.70 | 2.45 | 1.26 |
| M6 | 1 | 10.00 | 9.78 | 11.05 | 2.70 | 2.45 | 1.90 |
| M8 | 1.25 | 13.00 | 12.73 | 14.38 | 4.00 | 3.70 | 4.12 |
| M10 | 1.5 | 17.00 | 16.73 | 18.90 | 5.00 | 4.70 | 7.70 |
| M12 | 1.75 | 19.00 | 18.67 | 21.10 | 6.00 | 5.70 | 12.60 |
| M14 | 2 | 22.00 | 21.67 | 24.49 | 7.00 | 6.42 | 19.70 |
| M16 | 2 | 24.00 | 23.67 | 26.75 | 8.00 | 7.42 | 28.60 |
* Unit weight values are theoretical reference based on HPb56-4 brass density (8.50 g/cm³). Actual weights may vary slightly. Standard size range for brass DIN 439 is M3–M16; larger sizes available on request.
| Property | Value |
|---|---|
| Tensile Strength (min) | 390 N/mm² |
| Yield Strength (0.2% offset, min) | 150 N/mm² |
| Elongation (min) | 20% |
| Hardness (Vickers) | HV 80 – 130 |
| Density | 8.50 g/cm³ |
| Electrical Conductivity | ~26% IACS |
| Machinability Rating | ~80% (vs free-cutting steel = 100%) |
| Element | Cu (Copper) | Pb (Lead) | Fe (Iron) | Zn (Zinc) |
|---|---|---|---|---|
| Content % | 54.0–58.0 | 3.5–4.5 | ≤ 0.5 | Remainder |
* HPb56-4 is a Chinese national standard (GB/T 4423) free-cutting leaded brass. The lead content provides exceptional chip-breaking during machining, enabling high-speed CNC production with tight tolerances.
| Property | Brass HPb56-4 | A2 SS304 | A4 SS316 |
|---|---|---|---|
| Electrical Conductivity | Excellent (~26% IACS) | Poor (~2.5% IACS) | Poor (~2.5% IACS) |
| Machinability | Excellent | Moderate | Moderate |
| Non-Magnetic | Yes | Yes | Yes |
| Non-Sparking | Yes | No | No |
| Corrosion Resistance | Good (atmospheric) | Excellent | Superior |
| Marine / Saltwater | Not recommended | Limited | Recommended |
| Tensile Strength | ~390 N/mm² | 700 N/mm² | 700 N/mm² |
| Typical Applications | Electrical, plumbing, instruments | General industrial | Marine, chemical |
| Application | Recommended Size | Notes |
|---|---|---|
| Electrical / electronics assemblies | M3 – M8 | Conductive; ideal for grounding and bonding applications |
| Plumbing & gas fittings | M6 – M16 | Corrosion-resistant in water; compatible with brass fittings |
| Instrumentation & precision equipment | M3 – M10 | Non-magnetic; no interference with sensitive instruments |
| Explosive / flammable environments | M4 – M12 | Non-sparking brass is required in ATEX-rated zones |
| Locking / Jam applications | M3 – M16 | Pair with standard brass hex nut; tighten jam nut first |
| Decorative / architectural hardware | M4 – M12 | Natural brass finish provides warm golden aesthetic |
These thin hexagon nuts conform to DIN 439 Part B (equivalent to ISO 4035). Material conforms to GB/T 4423 HPb56-4 free-cutting leaded brass. Thread tolerance is per ISO 965-2 (6H).
DIN 439 Thin Hexagon Nuts — Brass HPb56-4 — FULLERKREG
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🏭 Direct Manufacturer — Factory-direct pricing with no middlemen, ensuring competitive wholesale rates.
🔩 Genuine HPb56-4 Brass — Verified free-cutting brass composition; not substituted with lower-grade alloys.
📐 Precision to Standard — Every nut manufactured and inspected to DIN 439 / ISO 4035 dimensional tolerances.
⚡ Electrically Conductive — Ideal for grounding, bonding, and electrical assembly applications.
🔥 Non-Sparking — Safe for use in explosive or flammable environments (ATEX applications).
📦 Bulk & Wholesale Ready — Flexible MOQ, bulk packaging, and custom labeling available for distributors.
🚢 Global Shipping — Reliable international logistics with experience in B2B export to 50+ countries.
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