316SS Round Head Square Neck Bolts
316SS Round Head Square Neck Bolts are popular fasteners used across various industries thanks to their excellent corrosion resistance, secure grip, and reliable performance. These bolts feature a dome-shaped round head and a square neck that keeps the bolt from turning when a nut is tightened. Designed primarily to fit into square holes or for carriage bolt applications, they’re highly reliable for structural connections, especially in marine or corrosive environments.
Product Overview
316SS Round Head Square Neck Bolts offer high strength, superior corrosion resistance, and an aesthetic finish. Commonly manufactured from marine-grade 316 stainless steel, these bolts are ideal for environments exposed to saltwater, chemicals, and other corrosive elements. Their square neck prevents rotation when installed in a square hole or when clamping with wood or metal surfaces. These bolts are also known as carriage bolts and are often used where smooth, tamper-resistant bolt heads are required.
Product Specifications
| Attribute | Specification |
|---|---|
| Product Name | 316SS Round Head Square Neck Bolts |
| Standard Compliance | ASTM A193, DIN603, ISO 8677 |
| Head Type | Round Head |
| Neck Type | Square Neck |
| Thread Type | Metric / UNC / UNF |
| Material | 316 Stainless Steel (Marine Grade) |
| Size Range Available | M6 to M20, 1/4’’ to 3/4’’ |
| Length Range | 10mm to 200mm, 1/2’’ to 8’’ |
| Finish | Plain / Passivated |
| Certification | ISO 9001:2015, Rohs, CE |
Technical Parameters
| Property | Value |
|---|---|
| Tensile Strength | up to 700 MPa |
| Yield Strength | min 450 MPa |
| Elongation | ≥30% |
| Hardness | ≤ 95 HRB |
| Corrosion Resistance Grade | Excellent (suitable for marine) |
| Operating Temperature | -50°C to 800°C |
Material and Manufacturing Process
These bolts are made of 316 stainless steel, known for its superior corrosion resistance and mechanical stability under harsh environments. The alloy mainly consists of chromium (16–18%), nickel (10–14%) and molybdenum (2–3%), which enhances its resistance to chlorides and other industrial solvents.
The manufacturing process involves cold heading/forming for head forging, precision machining of the square neck, threading via thread rolling or cutting, and surface finish via cleaning, polishing, and passivation. Quality checks are conducted at each stage to ensure dimensional accuracy and structural integrity.
Typical Applications and Industries
316SS Round Head Square Neck Bolts are widely used in:
- Marine and Offshore constructions
- Chemical processing plants
- Coastal architectural structures
- Automotive frames and parts
- Wooden structure fastening
- Railway and bridge projects
- Food processing equipment
Their excellent anti-corrosion properties and strong load-bearing capabilities make them suitable for these environments.
Product Advantages and Competitive Edge
- Premium material: Manufactured from top-grade 316 stainless steel ensuring rustproof and corrosion-resistant performance in extreme environments.
- Precision Engineering: Each bolt is crafted with strict thread and tolerance control for secured applications.
- Advanced Surface Finish: Polished and passivated surface provides enhanced anti-corrosion life.
- Strong Customization: Products can be customized to specific dimensions, thread patterns, and finishes based on customer-supplied drawings or samples.
- Readily Available Stock: Large inventory ensures immediate shipment and reduced lead times.
- Comprehensive Support: Our technical team offers up-to-date documentation and guides, ensuring smooth installation.
Company Testing and Quality Control
At Flybear Fastener, quality is non-negotiable. Every batch of 316SS Round Head Square Neck Bolts undergoes rigorous inspections, including dimensional tolerance checks, material testing (chemical and physical properties), tensile tests, salt spray testing, and visual inspections.
We use coordinate measuring machines (CMMs), hardness testers, and surface finish testers to ensure that our products meet or exceed industry-quality standards. We are ISO 9001:2015 certified and conduct frequent audits to stay compliance-ready.
Selection and Procurement Guide
When selecting Round Head Square Neck Bolts, consider the following:
- Required bolt length and diameter to match application needs
- Environment: Choose 316SS for extreme corrosion resistance
- Head and neck dimensions needed for fitment
- Thread type compatibility with nuts or tapped components
- Compliance with standard specifications e.g., DIN603, ASTM
Always consult engineers when selecting bolts for structural or critical applications. Our experts at Flybear Fastener are available to help you with choosing the right fastener and providing technical sheets or samples upon request.
Summary and Company Value
At Flybear Fastener, we’re committed to delivering superior quality fastening solutions that meet the highest industry standards. Whether you’re in marine, construction, or industrial manufacturing, our 316SS Round Head Square Neck Bolts offer unmatched reliability and strength.
We always uphold the principle of “Quality First, Customer Supreme”, and are dedicated to providing our partners with high-quality fastener products and one-stop solutions. Explore our extensive product range and contact us today to discuss your requirements and receive a comprehensive industry solution and quote tailored to your needs.
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