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FULLERKREG Phillips countersunk head machine screws in alloy steel 10B21, property class 8.8 are manufactured to the triple-standard specification of GB819-2016, DIN 965H, and EN ISO 7046-2. The 90° countersunk head with Phillips (Type H) cross recess delivers a flush-mount profile with high tensile strength, making this series the preferred choice for automotive assemblies, structural steel connections, machinery frames, and high-load mechanical joints. The trivalent zinc (Cr3) electroplating provides reliable corrosion protection while meeting RoHS and ELV directives — fully hexavalent-chromium-free.
| Attribute | Detail |
|---|---|
| Product Name | Phillips Countersunk Head Machine Screw |
| Standards | GB819-2016 / DIN 965H / EN ISO 7046-2 |
| Drive Type | Phillips (Cross Recess, Type H) |
| Head Type | Countersunk (Flat Head), 90° included angle |
| Material | Alloy Steel 10B21 (Boron Steel) |
| Property Class | Class 8.8 |
| Tensile Strength | ≥ 800 MPa (min.) |
| Yield Strength | ≥ 640 MPa (min.) |
| Surface Finish | Trivalent Zinc Electroplating (Cr3 / White Zinc) |
| Coating Thickness | 5–12 μm (standard); custom thickness available |
| RoHS / ELV Compliance | Yes — Hexavalent chromium (Cr6) free |
| Thread Type | Metric Coarse Thread (ISO 68-1) |
| Thread Tolerance | 6g per ISO 965-1 |
| Size Range | M3 – M10 |
| Length Range | 6 mm – 80 mm (size-dependent) |
| Head Angle | 90° |
| Recess Type | H (Phillips) per ISO 4757 |
| Brand | FULLERKREG |
| Property | Detail |
|---|---|
| Base Material | 10B21 boron-alloyed steel — excellent hardenability, consistent mechanical properties after heat treatment |
| Heat Treatment | Quenched & tempered to achieve Class 8.8 mechanical properties |
| Plating Type | Trivalent zinc (Cr3) electroplating — bright white appearance |
| Salt Spray Resistance | ≥ 72 hours (white rust) per ISO 9227 at standard 8 μm coating |
| Hydrogen Embrittlement | De-embrittlement baking applied post-plating for Class 8.8 |
| Chromate Passivation | Trivalent chromate (Cr3) — RoHS compliant, no Cr6+ |
| Operating Temperature | -50°C to +150°C (coating integrity maintained) |
All dimensions in millimeters (mm). Verified against GB819-2016 / DIN 965H / EN ISO 7046-2 standard drawings. dk = theoretical sharp head diameter; k = head height; a = thread run-out max; b = minimum thread length (partial thread for lengths > 38 mm).
| Thread Size |
Pitch (mm) |
dk max (mm) |
dk min (mm) |
k max (mm) |
k min (mm) |
a max (mm) |
b min (mm) |
Phillips Recess No. |
Approx. Unit Weight (g/100pcs)* |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.50 | 5.6 | 5.3 | 1.65 | 1.35 | 1.0 | 12 | No.1 | ~86 |
| M3.5 | 0.60 | 6.5 | 6.2 | 1.93 | 1.57 | 1.1 | 14 | No.2 | ~132 |
| M4 | 0.70 | 7.5 | 7.2 | 2.20 | 1.80 | 1.2 | 14 | No.2 | ~188 |
| M5 | 0.80 | 9.2 | 8.9 | 2.50 | 2.10 | 1.5 | 16 | No.2 | ~345 |
| M6 | 1.00 | 11.0 | 10.7 | 3.00 | 2.60 | 1.8 | 18 | No.3 | ~598 |
| M8 | 1.25 | 14.5 | 14.2 | 4.00 | 3.50 | 2.0 | 22 | No.3 | ~1,368 |
| M10 | 1.50 | 18.0 | 17.7 | 5.00 | 4.40 | 2.3 | 26 | No.4 | ~2,835 |
* Unit weights are approximate reference values for alloy steel (density ≈ 7.85 g/cm³) at nominal length, excluding coating. Actual weight varies by length. Contact FULLERKREG for certified weight data on specific lot sizes.
| Thread Size | Available Lengths (mm) | Fully Threaded Up To (mm) |
|---|---|---|
| M3 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40 | ≤ 30 mm |
| M3.5 | 6, 8, 10, 12, 16, 20, 25, 30, 35 | ≤ 30 mm |
| M4 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | ≤ 38 mm |
| M5 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60 | ≤ 38 mm |
| M6 | 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 | ≤ 38 mm |
| M8 | 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80 | ≤ 38 mm |
| M10 | 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80 | ≤ 38 mm |
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength (Rm) | ≥ 800 MPa | ISO 898-1 |
| Yield Strength / Proof Load (Rp0.2) | ≥ 640 MPa | ISO 898-1 |
| Hardness | 22–32 HRC (250–353 HV) | ISO 6507 |
| Elongation at Break | ≥ 12% | ISO 898-1 |
| Stress Under Proof Load | 580 MPa | ISO 898-1 |
| Impact Strength (Charpy) | ≥ 25 J at room temperature | ISO 179 |
| Application Scenario | Recommended Size | Reason |
|---|---|---|
| Automotive body panels & trim | M4 – M6 | High strength, flush head, Cr3 coating meets ELV directive |
| Machinery frames & structural joints | M6 – M10 | Class 8.8 tensile strength handles high shear and tension loads |
| Sheet metal enclosures & cabinets | M3 – M5 | Flush countersunk head, clean zinc finish, vibration-resistant |
| Electronic equipment housings | M3 – M4 | RoHS-compliant Cr3 coating, precise dimensional tolerance |
| Agricultural & construction equipment | M6 – M10 | High load capacity, zinc coating resists outdoor exposure |
| Furniture & fixture assembly | M4 – M6 | Flush head for clean aesthetics, strong clamping force |
| General industrial fastening | M3 – M10 | Versatile Class 8.8 strength, cost-effective vs. stainless |
These screws are manufactured in full compliance with the following international and national standards:
Thread tolerance: 6g per ISO 965-1. Head angle: 90°. Recess type: H (Phillips) per ISO 4757.
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