DIN 912 PDF — Download Free Technical Specification & Dimension Chart

The DIN 912 PDF is the essential reference document for engineers, procurement specialists, and quality teams working with socket head cap screws — also widely known as Allen bolts. DIN 912 defines the dimensional, mechanical, and tolerance requirements for hexagon socket head cap screws covering thread sizes from M1.6 to M100. Whether you need to verify DIN 912 thread pitch, confirm DIN 912 tolerances for a precision assembly, or determine the correct hex key engagement depth for a DIN 912 full thread fastener, this specification document is the authoritative source. Procurement teams rely on the DIN 912 dimension chart to cross-reference supplier data sheets, while design engineers use it to validate clearance holes, counterbore depths, and torque specifications. This page provides a free, direct download of the complete DIN 912 PDF in A4 printable format, along with a structured overview of the standard's key technical content.

What is DIN 912?

DIN 912 is a German Institute for Standardization (Deutsches Institut für Normung) specification that defines the requirements for hexagon socket head cap screws — commonly referred to as DIN 912 Allen bolts or hex socket cap screws. The standard specifies a cylindrical head profile with an internal hexagonal (Allen key) drive recess, making it the preferred fastener type for applications where a low-profile, high-clamping-force connection is required in confined or recessed installation spaces.

DIN 912 fasteners are engineered for high-strength structural and mechanical assemblies across industries including automotive, aerospace, hydraulics, machine tooling, and industrial equipment. The cylindrical socket head provides a large bearing surface relative to the shank diameter, distributing clamp load efficiently without requiring a washer in many applications.

Key design characteristics defined by DIN 912 include:

• Head type: Cylindrical socket head (flat top, straight cylindrical sides)
• Drive type: Internal hexagon (Allen key / hex key drive)
• Thread form: ISO metric coarse thread (standard) per ISO 68-1
• Strength grades: 8.8, 10.9, 12.9 (steel); A2-70, A4-80 (stainless steel)
• Size range: M1.6 through M100
• Equivalent standard: ISO 4762 (functionally identical for most sizes)

The standard has been widely adopted globally and is recognized as equivalent to ISO 4762 for the overlapping size range, making DIN 912 drawings and data sheets interchangeable with ISO 4762 documentation in most engineering contexts.

What's Inside the DIN 912 PDF?

The complete DIN 912 PDF technical specification includes the following reference data, suitable for use in engineering drawings, procurement specifications, and quality inspection:

• Complete dimension table (M1.6 to M100) — nominal diameter, pitch, head diameter (dk), head height (k), hex socket size (s), and key engagement depth (t)
• DIN 912 thread pitch chart for all metric sizes — coarse pitch values for every standard thread designation from M1.6 to M100
• DIN 912 tolerances reference — socket tolerance h13, thread tolerance 6g, head diameter tolerance per ISO 286
• DIN 912 full thread vs partial thread length guide — minimum full thread lengths by diameter, transition lengths, and grip length calculations
• Head diameter, head height, and hex key size chart — tabulated values for all standard sizes with nominal and limit dimensions
• Material grades and mechanical properties — 8.8, 10.9, 12.9 (alloy steel); A2-70, A4-80 (austenitic stainless steel); proof load, tensile strength, and hardness ranges
• Surface finish and coating notes — plain, zinc plated, hot-dip galvanized, Geomet, and black oxide options
• Technical drawing — dimensioned cross-section drawing with callout references matching the dimension table

For weight data by size and material, refer to the DIN 912 weight chart, which provides mass per piece values for all standard thread sizes in steel and stainless steel.

DIN 912 vs ISO 4762

DIN 912 and ISO 4762 define functionally equivalent socket head cap screws and share identical dimensional requirements for the overlapping size range (M1.6 to M64). The primary difference is that ISO 4762 is the internationally harmonized standard published by the International Organization for Standardization, while DIN 912 is the original German national standard from which ISO 4762 was derived. In practice, fasteners manufactured to DIN 912 are fully interchangeable with ISO 4762 parts of the same size and grade. The DIN 912 PDF download on this page includes a cross-reference table confirming dimensional equivalence. For a detailed comparison of markings, grade designations, and regional procurement considerations, see the full ISO 4762 equivalent reference page.

Download DIN 912 PDF

The DIN 912 technical specification PDF is available for free download below. The document is formatted for A4 printing and includes the complete dimension table, tolerance references, thread pitch chart, full thread length guide, and dimensioned technical drawing. No registration is required.

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Related Standards

Engineers specifying DIN 912 socket head cap screws frequently reference the following related fastener standards. Each link leads to a dedicated specification page with dimension tables, PDF downloads, and procurement notes:

• DIN 912 Weight Chart — Mass per piece for all metric sizes in steel (8.8, 10.9, 12.9) and stainless steel (A2, A4). Essential for shipping weight calculations and BOM costing.
• DIN 912 ISO 4762 Equivalent — Detailed cross-reference of DIN 912 and ISO 4762 dimensional data, grade markings, and interchangeability guidance.
• DIN 7984 Low Head Cap Screw — Reduced-height socket head cap screw for space-constrained assemblies where standard DIN 912 head height exceeds available clearance.
• DIN 6912 Low Head with Center Hole — Low-profile socket head cap screw with a through-hole in the hex socket for torque verification and tamper-evidence applications.

All dimension data on this page is provided for reference purposes. Always verify against the current edition of the applicable standard before use in safety-critical applications. FULLERKREG Fasteners supplies DIN 912 socket head cap screws in grades 8.8, 10.9, 12.9, A2-70, and A4-80 with full material traceability and third-party test certification available on request.