We are a trusted supplier of DIN 603 round head square neck bolts in India, offering a wide range of sizes, materials, and finishes to meet diverse industrial needs. These precision fasteners are widely used in wood-to-metal and wood-to-wood connections across industries like construction, furniture, and machinery. Designed as per DIN 603 standards, these bolts feature a smooth domed head and square neck for anti-rotation performance. We ensure timely delivery, competitive pricing, and consistent quality through our strong sourcing network.
DIN 603 round head square neck bolts are standardized fasteners defined by the German Institute for Standardization. These bolts are designed with a domed (mushroom) head and a square neck just beneath it. The square section locks into the base material, preventing the bolt from rotating during installation—making it ideal for applications where only one side is accessible.
These bolts are widely used in woodworking, metal fabrication, furniture assembly, and railway components. The round head gives a clean finish while the square neck ensures a firm grip and tamper resistance.
With growing demand for high-strength and tamper-resistant fastening solutions, Mushroom Head Square Neck Bolts (DIN 603) have become a staple in both industrial and structural applications. These bolts offer a flush, smooth finish with a round head on one side, while the square neck underneath ensures the bolt stays locked in place during tightening. This makes them ideal for use in wooden beams, metal frames, and railway fastenings where only one side is accessible.
We supply a comprehensive range of DIN 603 bolts from reputable manufacturers, ensuring compliance with international standards and dimensional accuracy. Whether you’re sourcing for OEM production, repair and maintenance, or bulk construction projects, our Mumbai-based distribution network ensures that you get the right fastener, at the right time, every time. Backed by technical expertise and inventory support, we help clients streamline their procurement process for all types of industrial bolts.
We offer DIN 603 bolts in a wide range of metric sizes (M5 to M20), lengths, and material grades. These bolts conform to DIN 603 standards, ensuring uniform dimensions, high performance, and compatibility across applications. Below are the standard specifications we supply:
| Parameter | Specification |
|---|---|
| Standard | DIN 603 |
| Bolt Type | Round Head with Square Neck |
| Thread Type | Metric (Full/Partial Thread) |
| Sizes Available | M5, M6, M8, M10, M12, M16, M20 |
| Length Range | 10mm to 200mm (varies by diameter) |
| Material Options | Mild Steel, Stainless Steel (A2, A4) |
| Grades | 4.6, 8.8 (MS), A2-70, A4-70 (SS) |
| Surface Finishes | Zinc Plated, Hot-Dip Galvanized, Self-Color, Black Oxide |
| Head Style | Domed / Mushroom Head |
| Neck Type | Square (anti-rotation feature) |
| Applications | Wood-to-Metal, Railways, Fencing, Furniture, Construction |
DIN 603 bolts, also referred to as mushroom head square neck bolts, are widely used across industries that require secure fastening with a clean surface finish and anti-rotation locking. Their design makes them ideal for load-bearing and aesthetically sensitive applications where tamper resistance is important.
Common application areas include:
Wood-to-Metal and Wood-to-Wood Connections
Used in timber framing, deck construction, and structural joinery.
Furniture Assembly
Ideal for concealed fastening in furniture where the head remains visible.
Railway Infrastructure
Secures components in tracks, platforms, and wooden sleepers.
Fencing and Gate Installations
Often used where a smooth head is preferred for safety and appearance.
Automotive and Trailer Manufacturing
For securing wooden floors, panels, and supports.
Construction and Civil Engineering Projects
Suitable for temporary or permanent wooden formworks and scaffold structures.
General Engineering and Fabrication Work
Used where non-rotating bolt installation is required.
These bolts are preferred in scenarios where one side of the material is inaccessible during assembly and where aesthetic finish or safety is a concern.
As a reliable supplier of industrial fasteners in Mumbai, Vimal Industrial Corporation ensure that our clients receive only high-quality DIN 603 bolts that meet international standards. Our extensive sourcing network, prompt delivery, and technical know-how make us a trusted partner for businesses across sectors like construction, fabrication, OEM manufacturing, and infrastructure.
Here’s why customers choose us for their fastener needs:
Ready Stock Availability – Wide range of sizes, materials, and finishes in stock for quick dispatch
Sourcing from Certified Manufacturers – All products comply with DIN standards and are tested for performance
Custom Sizing & Bulk Orders – Support for project-based supply and special procurement needs
Competitive Pricing – Transparent rates and cost-effective solutions for large-volume requirements
Pan India Delivery – Fast shipping across Mumbai, Maharashtra, and all major industrial zones in India
Responsive Support – Prompt quotations, technical assistance, and post-sales support
Whether you are a contractor, OEM, or distributor, we ensure consistent supply of DIN 603 bolts with complete traceability and quality documentation when required.
| Parameter | M5 | M6 | M8 | M10 | M12 | M16 | M20 |
|---|---|---|---|---|---|---|---|
| Thread Pitch (P) | 0,8 | 1 | 1,25 | 1,5 | 1,75 | 2 | 2,5 |
| b (for ≤ 125mm length) | 16 | 18 | 22 | 26 | 30 | 38 | 46 |
| b (for 125 < l ≤ 200mm) | 22 | 24 | 28 | 32 | 36 | 44 | 52 |
| b (for > 200mm) | - | - | 41 | 45 | 49 | 57 | 65 |
| Head Diameter dk (max) | 13,55 | 16,55 | 20,65 | 24,65 | 30,65 | 38,8 | 46,8 |
| Head Diameter dk (min) | 12,45 | 15,45 | 19,35 | 23,35 | 29,35 | 37,2 | 45,2 |
| Square Neck Height (max) | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| Square Neck Width (mix) | 4,52 | 5,52 | 7,42 | 9,42 | 11,3 | 15,3 | 19,16 |
| Specification | Details |
|---|---|
| Material | Steel |
| General Requirements | According to DIN 267 Part 1 |
| Thread Tolerance | 8g |
| Thread Standard | DIN 13 Part 13 |
| Strength Categories | 3.6 or 4.6 at manufacturer’s discretion 8.8 or other grades upon agreement |
| Mechanical Properties Standard | DIN ISO 898 Part 1 |
| Product Grade | C (previously type g) |
| Dimensional Tolerance Standard | DIN ISO 4759 Part 1 |
| Surface Requirements |
DIN 267 Part 2 – Surface finish quality DIN 267 Part 9 – Galvanic surface protection DIN 267 Part 10 – Hot-dip galvanizing DIN 267 Part 19 – Surface defects acceptance |
| Acceptance Testing | According to DIN 267 Part 5 |
DIN 603 bolts are primarily used in wood-to-wood and wood-to-metal joints where a smooth, tamper-resistant finish is required. Common applications include furniture manufacturing, fencing, railways, and construction frameworks. The square neck prevents rotation during installation, making them ideal where only one side of the material is accessible.
Unlike hex bolts, DIN 603 bolts feature a domed (mushroom) head and a square neck beneath the head. This design allows the bolt to lock into place without turning, offering a cleaner appearance on the visible side. Hex bolts, on the other hand, require a wrench on both ends and are more suited for applications where both sides are accessible.
We supply DIN 603 bolts in mild steel (grades 4.6, 8.8) and stainless steel (A2-70, A4-70). Surface finishes include zinc plating, hot-dip galvanizing, black oxide, and self-color, ensuring corrosion resistance for different environmental conditions.
Yes, especially when made from stainless steel A4-70 or hot-dip galvanized mild steel, DIN 603 bolts offer excellent corrosion resistance and are well-suited for outdoor, marine, and industrial environments.
Absolutely. We support bulk supply requirements, project-based procurement, and custom sizing on request. Our wide sourcing network ensures timely delivery and consistent quality for commercial and industrial clients.
Need assistance with your bolts and screws or have questions about our fastening solutions? We’re here to help!
