Vimal Industrial Corporation is a trusted supplier of DIN 931 partially threaded hex head bolts based in Mumbai, India. We offer a wide range of sizes, grades, and surface finishes to suit the demanding requirements of construction, fabrication, and engineering industries. Manufactured as per DIN 931-1 standards, these high-tensile bolts deliver superior strength, durability, and load-bearing capacity—ideal for structural and mechanical assemblies across various sectors.
DIN 931 hex bolts are partially threaded fasteners with a standard hexagonal head and a solid shank portion. These bolts comply with the DIN 931-1 standard, making them ideal for high-load applications where strength and alignment are critical. The unthreaded portion increases shear strength, making them suitable for structural joints and machinery assemblies that experience heavy loads and vibrations.
Widely used in automotive, wind turbine assembly, construction steel frameworks, heavy machinery, and general fabrication, DIN 931 bolts are available in grades 4.6, 8.8, 10.9, and 12.9, with material options including carbon steel and stainless steel (A2, A4).
With increasing demand for high-tensile and structurally reliable fastening solutions, DIN 931 Hex Head Bolts have become a preferred choice across engineering, infrastructure, and heavy industrial projects. These partially threaded bolts are designed to deliver high clamping force and superior load-bearing capacity, with a hexagonal head that ensures ease of tightening using standard tools. The unthreaded shank helps distribute stress more evenly, making them ideal for machinery, steel frameworks, and bolted joints subject to vibration or shear force.
At Vimal Industrial Corporation, we supply a wide range of DIN 931 bolts sourced from trusted manufacturers, including APL Fasteners. All products comply with international dimensional and mechanical standards, ensuring consistent performance and durability. Whether your requirement is for OEM assembly, maintenance stock, or bulk construction supply, our strategic presence in Mumbai enables us to fulfill orders quickly and efficiently—backed by knowledgeable support and a strong inventory base.
DIN 931 hex bolts are engineered for strength, alignment, and durability, making them suitable for applications that demand high preload, structural stability, and reliable joint integrity. Their partially threaded design improves shear strength, while the hex head allows for easy torque application during assembly.
Common Applications Include:
Steel Structure Fabrication
Widely used in steel columns, beams, and truss connections for structural frameworks.
Heavy Machinery Assembly
Ideal for bolting together machine frames, housings, and base plates under high stress.
Construction and Infrastructure Projects
Used in bridges, metro projects, power plants, and building construction for critical joints.
Wind and Renewable Energy Installations
Essential for anchoring turbine components and modular support structures.
Automotive and Transport Manufacturing
Applied in chassis, frame rails, and suspension assemblies requiring high-tensile bolts.
General Engineering and Equipment Fabrication
Suitable for any industrial project needing secure, vibration-resistant bolted joints.
As a trusted name in the industrial fasteners sector, Vimal Industrial Corporation is known for its reliable sourcing, prompt delivery, and deep technical understanding. We specialize in supplying DIN 931 hex bolts that meet global performance standards, catering to a wide range of industries including infrastructure, automotive, power, and heavy engineering.
Why clients across India choose us:
✅ Authorized Dealer of APL Fasteners – Access to certified, branded fasteners with assured quality
✅ Wide Inventory Range – DIN 931 bolts in various sizes, grades, and finishes readily available
✅ Bulk Order Fulfillment – Efficient handling of large-volume or project-based requirements
✅ Technical Expertise – Assistance in product selection based on application and strength needs
✅ Fast Dispatch & Pan-India Delivery – Quick turnaround from our Mumbai-based warehouse
✅ Consistent Quality Assurance – Products conform to DIN 931-1 and ISO mechanical standards
Whether you’re an OEM, contractor, or industrial buyer, we simplify your fastener procurement with timely service, accurate documentation, and unbeatable reliability.
| Thread (d) | Pitch (P) | Head Height (k) | Width Across Flats (s) | Radius (r) | Min. Thread Length (l) | Min. Shank Length (ls) |
|---|---|---|---|---|---|---|
| M5 | 0.8 | 3.5 | 8 | 0.6 | 16 | 12 |
| M6 | 1.0 | 4 | 10 | 0.8 | 18 | 14 |
| M8 | 1.25 | 5.3 | 13 | 1.0 | 22 | 18 |
| M10 | 1.5 | 6.4 | 17 | 1.2 | 26 | 22 |
| M12 | 1.75 | 7.5 | 19 | 1.5 | 30 | 26 |
| M16 | 2.0 | 10 | 24 | 2.0 | 38 | 32 |
| M20 | 2.5 | 12.5 | 30 | 2.5 | 46 | 40 |
| M24 | 3.0 | 15 | 36 | 3.0 | 54 | 48 |
| M30 | 3.5 | 18.7 | 46 | 3.5 | 66 | 60 |
| M36 | 4.0 | 22.5 | 55 | 4.0 | 78 | 72 |
| Feature | Tolerance / Fit Class | Standard Reference |
|---|---|---|
| Thread Tolerance | 6g (external thread) | ISO 965-1 |
| Head Height (k) | ±0.15 mm (for M5–M10) | DIN EN ISO 4014 |
| Width Across Flats (s) | ±0.2 mm (for M5–M16) | DIN EN ISO 272 |
| Shank Length | +2 / -0 mm | DIN EN ISO 4753 |
| Overall Length (l) | ±1.5 mm | DIN EN ISO 4753 |
DIN 931 bolts are partially threaded hex head bolts, whereas DIN 933 bolts are fully threaded. DIN 931 is preferred when unthreaded shank is needed for shear strength or precise alignment.
DIN 931 bolts are available in mild steel, carbon steel, alloy steel (grades 8.8, 10.9, 12.9), stainless steel (A2, A4), and non-ferrous metals depending on application needs.
Property classes represent mechanical strength. For example, class 8.8 means 800 MPa tensile and 640 MPa yield strength. Higher numbers indicate stronger bolts used in more demanding applications.
They are widely used in construction, machinery, automotive, power plants, and heavy industrial fabrication where high strength and partial threading are required.
Yes, at Vimal Industrial Corporation, we provide material test certificates (MTCs), compliance documents, and quality assurance reports with every batch upon request.
