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 |
The unthreaded shank section of a DIN 931 bolt provides greater shear resistance and better alignment. In high-end construction projects in India, engineers use the smooth section of the bolt’s shank that passes through the joint for better resistance against thread wear and structural movement.
These are property classes indicating tensile strength. An 8.8 grade is standard for general machinery, while 10.9 is for high-stress automotive or industrial parts. Sourcing these high-tensile stainless steel fasteners from a trusted hub like Vimal Industrial ensures the ratings are genuine.
Yes, they use standard metric threading. However, to maintain the integrity of the assembly, experts suggest pairing them with nuts and washers of the same grade. Top-tier nut bolt suppliers always recommend matching the material class for consistent performance.
Standard alloy steel works well, but for extreme heat, specific stainless steel or alloy grades are needed. It is wise to consult a technical bolt fastener specialist to ensure the material won’t lose its tensile strength under thermal stress.
The secret is “Batch Traceability.” It means every hex head bolt can be tracked back to its raw material source. Experts at Vimal Industrial always provide Mill Test Reports (MTR) with their high-tensile fasteners, proving the bolt has passed all strength tests and won’t snap under the load.
