Vimal Industrial Corporation is a trusted supplier of DIN 931 Hex Head Bolts in Mumbai, offering a wide range of sizes, grades, and surface finishes to meet the demanding requirements of construction, fabrication, and heavy engineering industries. Manufactured in compliance with DIN 931-1 standards, these partially threaded hexagon head bolts are built to deliver consistent strength, dimensional accuracy, and long-term load-bearing performance across structural and mechanical assemblies.
DIN 931 Hex Head Bolts are partially threaded fasteners featuring a standard hexagonal head and a solid unthreaded shank section. That unthreaded portion is what sets them apart, it increases shear strength significantly, making these bolts the right choice for joints and assemblies that face heavy loads, dynamic stress, or continuous vibration. Where full-thread bolts can compromise on shear capacity, DIN 931 bolts hold alignment and absorb lateral force without failure. As established bolts suppliers in India, we ensure every bolt we supply meets DIN 931-1 dimensional tolerances with no compromise on grade or finish.
These bolts are widely used across automotive manufacturing, wind turbine assembly, construction steel frameworks, heavy machinery installations, and general fabrication work. Their versatility across industries comes from a straightforward combination of reliable geometry, multiple available grades, and material options that cover both standard and corrosion-resistant requirements. Whether the environment is a controlled factory floor or an outdoor structural installation, there is a DIN 931 specification built for it.
In structural engineering and heavy industrial assembly, the fastener you choose directly determines how long a joint holds under load, vibration, and stress. DIN 931 Hex Head Bolts are built for exactly these conditions, partially threaded, high-tensile, and designed to deliver reliable clamping force across machinery, steel frameworks, and bolted connections that face continuous operational demand. The unthreaded shank distributes stress more evenly through the joint, reducing failure risk in applications subject to shear force or dynamic loading where fully threaded bolts simply fall short.
At Vimal Industrial Corporation, we supply a comprehensive range of DIN 931 Hex Head Bolts sourced from trusted and certified manufacturers, including APL Fasteners, one of India’s reputable names in industrial fastener production. Every bolt we stock complies with international dimensional and mechanical property standards, so procurement teams and site engineers can rely on consistent performance across batches without re-verification at every order cycle. As authorized APL Fasteners dealers and established bolts suppliers in India, we bring both product credibility and supply reliability to every client relationship.
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.
Sourcing the right fastener from the right supplier is not just a procurement decision, it directly affects assembly quality, project timelines, and long-term structural reliability. Vimal Industrial Corporation has built its reputation in the industrial fasteners sector on consistent supply, technical accuracy, and procurement support that actually reduces your workload rather than adding to it. We serve a wide range of industries including infrastructure, automotive, power generation, and heavy engineering across India.
Why clients across India choose us:
Authorized Dealer of APL Fasteners — Direct access to certified, branded stainless steel fasteners and carbon steel bolts with full quality assurance and traceability from a recognized manufacturer.
Wide Inventory Range — DIN 931 Hex Head Bolts stocked across multiple sizes, property classes, and surface finishes for immediate dispatch without lead time delays.
Bulk Order Fulfillment — Structured supply support for large-volume procurement, project-based requirements, and scheduled delivery arrangements for OEM and construction clients.
Technical Expertise — Practical guidance on grade selection, material suitability, and dimensional requirements based on your specific application and load conditions, not generic recommendations.
Fast Dispatch and Pan-India Delivery — Quick turnaround from our Mumbai-based warehouse with reliable shipping to all major industrial zones, project sites, and manufacturing hubs across India.
Consistent Quality Assurance — Every bolt we supply conforms to DIN 931-1 and ISO mechanical property standards, giving engineers and procurement teams confidence in what they are installing.
Whether you are an OEM manufacturer, civil contractor, or industrial buyer managing ongoing fastener procurement, Vimal Industrial Corporation simplifies your sourcing process with accurate documentation, dependable stock availability, and a team that understands what bolts and nuts suppliers in Mumbai should genuinely deliver. Get in touch today for pricing, grade availability, or project-specific supply requirements.
| 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.
