What Are ISO 1580 & DIN 85?
The global metric standard for slotted pan head machine screws used in threaded holes or paired with metric nuts.
ISO 1580 (and its German standard predecessor DIN 85) specifies the dimensions, mechanical properties, and tolerances for metric slotted pan head machine screws. These screws feature a slightly rounded, low-profile dome head with a flat bearing surface that offers excellent clamping area without damaging softer mating surfaces. The standard covers two primary drive variations:
ISO 1580 / DIN 85
Standard single-slot drive designed for installation using standard flat-blade screwdrivers. Sizes range from M1.6 to M10.
Drive: Slotted (Straight) | Thread: Metric Coarse (ISO 261)
ISO 7045 / DIN 7985
Identical pan head profile featuring a Phillips or Pozidriv cross-recess drive for power-driver assembly lines.
Drive: Phillips / Pozidriv | Thread: Metric Coarse (ISO 261)
Property Classes, Materials & Finishes
Material Grades & Options
- Property Class 4.8 Carbon Steel: Economical low-carbon steel for standard light-duty mechanical and electrical applications. Typically zinc-plated.
- Property Class 8.8 High Tensile Steel: Medium carbon steel quenched and tempered for applications requiring higher shear and tensile holding force.
- Stainless Steel A2-70 (AISI 304): Corrosion-resistant austenitic stainless steel for indoor/outdoor electrical cabinets, food machinery, and architectural fittings.
- Stainless Steel A4-70 / A4-80 (AISI 316): Marine-grade stainless steel with molybdenum for harsh coastal UAE environments, chemical processing, and desalination plants.
- Brass (CuZn): Non-magnetic and highly conductive alloy ideal for electrical terminals, switchgear, and decorative assemblies.
Mechanical Properties (ISO 898-1 / ISO 3506-1)
| Property | Class 4.8 Steel | Class 8.8 Steel | Stainless A2-70 / A4-70 | Brass (CuZn) |
|---|---|---|---|---|
| Tensile Strength (Rm) | 400 MPa | 800 MPa | 700 MPa | ≥ 380 MPa |
| Yield Strength (Rp0.2) | 320 MPa | 640 MPa | 450 MPa | ≥ 200 MPa |
| Elongation (A) | ≥ 14% | ≥ 12% | ≥ 0.4d | ≥ 15% |
| Surface Finish | Zinc Plated / Plain | Zinc Plated / Black | Plain (Passivated) | Plain / Nickel Plated |
Chemical Composition Standards
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Key Elements |
|---|---|---|---|---|---|
| Class 4.8 / 5.8 | ≤ 0.55% | ≥ 0.25% | ≤ 0.050% | ≤ 0.060% | Low Carbon Steel |
| Class 8.8 | 0.25 – 0.55% | ≥ 0.35% | ≤ 0.025% | ≤ 0.025% | Medium Carbon Steel |
| Stainless A2 (304) | ≤ 0.08% | ≤ 2.00% | ≤ 0.045% | ≤ 0.030% | 17.5–19.5% Cr | 8.0–10.5% Ni |
| Stainless A4 (316) | ≤ 0.08% | ≤ 2.00% | ≤ 0.045% | ≤ 0.030% | 16.5–18.5% Cr | 10.0–13.0% Ni | 2.0–2.5% Mo |
| Brass | — | — | ≤ 0.01% | — | 60–63% Cu | Balance Zn |
ISO 1580 / DIN 85 Dimensions
Standard metric dimensions in millimetres (mm) according to ISO 1580 specification.
Metric Slotted Pan Head Dimensions
| Nominal Size (d) | Thread Pitch (P) | Head Diam. dk (max) | Head Height k (max) | Slot Width n (nom) | Slot Depth t (min) |
|---|---|---|---|---|---|
| M2 | 0.40 mm | 4.00 mm | 1.30 mm | 0.50 mm | 0.60 mm |
| M2.5 | 0.45 mm | 5.00 mm | 1.50 mm | 0.60 mm | 0.70 mm |
| M3 | 0.50 mm | 6.00 mm | 1.80 mm | 0.80 mm | 0.85 mm |
| M4 | 0.70 mm | 8.00 mm | 2.40 mm | 1.20 mm | 1.10 mm |
| M5 | 0.80 mm | 10.00 mm | 3.00 mm | 1.20 mm | 1.30 mm |
| M6 | 1.00 mm | 12.00 mm | 3.60 mm | 1.60 mm | 1.60 mm |
| M8 | 1.25 mm | 16.00 mm | 4.80 mm | 2.00 mm | 2.10 mm |
| M10 | 1.50 mm | 20.00 mm | 6.00 mm | 2.50 mm | 2.60 mm |
Where & How to Use ISO 1580 Screws
Electrical & Control Panels
Widely specified for mounting circuit boards, grounding terminals, switchgear, and electrical duct covers in industrial panels across UAE.
Electronics & Instrumentation
Ideal for precision measuring equipment, medical devices, and laboratory enclosures requiring reliable light-duty screw fastening.
HVAC & Ductwork Assemblies
Used to fix access doors, damper controls, and thin sheet metal casings in mechanical building services (MEP).
Corrosive Marine Environments
Stainless steel A4-70 ISO 1580 screws are essential for coastal and marine electrical junction boxes to prevent rust staining.
Easy Field Serviceability
Slotted drives allow simple maintenance and field repair using basic flat-head hand tools without needing specialized driver bits.
Complete RFQ Format
"ISO 1580 Slotted Pan Head Machine Screw, M5 x 20mm, Stainless Steel A2-70, Passivated, Full Thread."
Complementary Fastener Standards
| Standard | Description | Relationship to ISO 1580 |
|---|---|---|
| DIN 85 | Slotted pan head machine screws | Withdrawn German equivalent standard to ISO 1580 |
| ISO 7045 / DIN 7985 | Pan head screws with cross recess (Phillips/Pozidriv) | Cross-recess drive variant with identical head profile |
| ISO 1207 / DIN 84 | Slotted cheese head machine screws | Cylindrical head alternative for deep counterbore holes |
| ISO 2009 / DIN 965 | Slotted countersunk flat head screws | Flush-mounting 90° countersunk variant |
| ISO 1580 Fine | Pan head machine screws with fine pitch thread | Fine thread metric variant for precision tuning |
| DIN 934 / ISO 4032 | Hexagon nuts | Standard mating nut for through-hole assemblies |
| DIN 125 / ISO 7089 | Plain washers | Recommended washer under screw head or nut |
Frequently Asked Questions
Need ISO 1580 / DIN 85 Screws in UAE & GCC?
We supply ISO 1580 and DIN 85 slotted pan head machine screws in Steel (4.8, 8.8), Stainless Steel (A2-70, A4-70/80), and Brass. Full stock range from M1.6 to M10 with zinc-plated, nickel-plated, or passivated finishes. Rapid dispatch from RAK FREEZONE.
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