GB70.1 / DIN 912 / ISO 4762 Socket Cap Screw Grade 12.9 Material ML40Cr

FULLERKREG DIN 912 / ISO 4762 / GB70.1 Grade 12.9 Socket Cap Screws — ML40Cr Economy Series

FULLERKREG offers DIN 912 / ISO 4762 / GB70.1 Grade 12.9 Socket Cap Screws in ML40Cr carbon steel as a cost-effective option designed to meet market demand for budget-conscious procurement. These screws meet Grade 12.9 mechanical requirements and are suitable for general high-strength applications where premium alloy steel is not required.

⚠️ Material Notice: This page features the economy ML40Cr (40Cr carbon steel) version. If your application requires premium chromium-molybdenum alloy steel (SCM435/SCM440) for superior toughness, fatigue resistance, and delayed fracture resistance, please visit our alloy steel series: DIN 912 Grade 12.9 — SCM435 Alloy Steel Series →

ML40Cr vs SCM435 — Material Comparison

Understanding the difference between ML40Cr and SCM435 helps you select the right fastener for your application:

➡️ Need SCM435 alloy steel? Click here to view the SCM435 series →

Product Specifications

• Standards: DIN 912 / ISO 4762 / GB70.1
• Strength Grade: 12.9
• Material: ML40Cr (40Cr carbon steel)
• Tensile Strength: Min. 1,220 MPa (approx. 120–140 kg/mm²)
• Yield Strength: Min. 1,100 MPa
• Hardness: HRC 39–44
• Surface Treatment: Black oxide (blackening)
• RoHS Compliance: ✅ Compliant — no hexavalent chromium (Cr6+) or restricted substances
• Thread Tolerance: 6g (Product Class A)
• Thread Type: Standard metric thread
• Drive Type: Hexagon socket (Allen key)
• Sizes Available: M1.4 – M80

Material — ML40Cr Chemical Composition (%)

All values are maximum unless a range is indicated.

Mechanical Properties — Grade 12.9 (DIN 912 / ISO 4762)

The following mechanical properties apply per ISO 898-1 requirements.

Available Sizes

Quality Control & Inspection

All FULLERKREG DIN 912 Grade 12.9 ML40Cr fasteners are subject to the following inspections. Test reports are available upon request.

1. Dimensional Inspection: Appearance, thread (e.g. M10-P1.5-6g), hex socket gauge, head diameter, head height, hex key depth, body diameter, thread length, overall length
2. Mechanical Properties: Core hardness, tensile strength, yield stress, elongation after fracture
3. Chemical Analysis: C, Si, Mn, P, S, Cr

Download sample inspection report (PDF) →

Download Specifications

• DIN 912 Grade 12.9 — Product Datasheet (PDF)
• DIN 912 / ISO 4762 — Full Dimensional Specification (PDF)

Applications

FULLERKREG DIN 912 Grade 12.9 ML40Cr socket cap screws are suitable for general high-strength applications including:

• General machinery and equipment assembly
• Industrial fixtures and tooling
• Structural assemblies with moderate fatigue requirements
• Cost-sensitive bulk procurement projects
• Applications where Grade 12.9 strength is required but premium alloy steel is not specified

⚠️ For applications involving high-cycle fatigue, delayed fracture risk, or critical structural joints (automotive, robotics, wind power), we recommend the SCM435 alloy steel series.

Quality Assurance

All FULLERKREG DIN 912 Grade 12.9 ML40Cr fasteners are manufactured under strict quality control including:

• Rockwell hardness test (HRC 39–44)
• Tensile strength test (min. 1,220 MPa)
• Dimensional inspection per DIN 912 / ISO 4762
• RoHS substance verification — no hexavalent chromium (Cr6+)
• Chemical composition analysis (C, Si, Mn, P, S, Cr)

For wholesale pricing, bulk orders, or technical inquiries, please contact our sales team.