#flangeheadbolt

Introduction

Flange head bolts are an essential component in a wide range of industrial applications, known for their built-in washer-like flange that helps distribute the load evenly and enhances clamping performance. These bolts eliminate the need for a separate washer, making installations faster and more efficient. As a trusted flange head bolt manufacturer, Ananka Group delivers top-quality fasteners that meet international standards and serve various industries across the globe.

What is a Flange Head Bolt?

A flange head bolt features a circular flange under the head, which acts like a washer to distribute the load more uniformly. This design offers several advantages:

Improved load distribution

Enhanced grip and holding strength

Reduced risk of loosening due to vibrations

Faster assembly with fewer components

These bolts are commonly used in automotive, construction, machinery, and heavy engineering sectors.

Flange Head Bolt Manufacturer – Ananka Group

Ananka Group is a trusted name in the fasteners manufacturing industry, known for delivering consistent quality and customized flange bolt solutions. Our advanced manufacturing setup, skilled workforce, and commitment to quality make us one of the top choices for flange head bolts in India and overseas markets.

Key Highlights:

Precision engineering and adherence to global standards

Available in metric and imperial sizes

Options for full or partial threading

Wide material selection, including corrosion-resistant alloys

Surface-treated bolts for enhanced performance and durability

Flange Head Bolt Specifications

Types of Flange Head Bolts We Manufacture

Hex Flange Bolts

Serrated Flange Bolts

12-Point Flange Head Bolts

Metric Flange Bolts

Custom-designed flange Bolts as per Client Requirements

Industries We Serve

Flange bolts are widely used in industries such as:

Oil & Gas Pipelines

Refineries

Offshore Platforms

Pressure Vessels

Marine Shipbuilding

Underwater Structures

Why Choose Ananka Group?

Global Exporter – We export flange head bolts to the USA, UK, UAE, Germany, Canada, Australia, Singapore, South Africa, and more.

Custom Manufacturing – Tailor-made solutions as per drawing, specification, or international standards.

Wide Material Range – From stainless steel to exotic alloys, we cover a broad spectrum of material grades.

Certifications – ISO 9001:2015 certified manufacturing, with full traceability and compliance with ASTM, DIN, BS, ISO standards.

Fast Delivery – With a robust supply chain, we ensure timely delivery to both domestic and overseas clients.

Global Presence

India Office (Head Office & Factory):

USA Office:

Ananka Group LLC8003 S Breaswood Blvd, Houston TX 77071

UK Office:

Ananka Fasteners Ltd 23 Ash Grove Stanley WF3 4JY

Export Destinations

Ananka Group is a renowned flange head bolt exporter in countries such as:

USA

UK

Germany

France

Canada

Mexico

UAE

Oman

Singapore

Malaysia

Australia

South Africa

Conclusion

If you're looking for a reliable flange head bolt manufacturer, Ananka Group delivers exceptional quality fasteners with international certifications, timely delivery, and custom manufacturing support. We aim to offer solutions that meet both general and critical application requirements with precision and performance.

Frequently Asked Questions (FAQ)

Q1. Are flange bolts suitable for high-vibration environments?

Ans: Yes, especially serrated flange bolts, which provide better grip and resist loosening due to vibrations.

Q2. What industries typically use flange head bolts?

Ans: Automotive, construction, oil & gas, marine, power generation, and heavy engineering industries.

Q3. What materials are flange head bolts available in?

A: We manufacture them in stainless steel, carbon steel, alloy steel, brass, titanium, and duplex/super duplex alloys.

Q4. Can flange bolts be customized?

A: Yes, we offer custom bolt manufacturing based on client specifications, including size, thread, and coating.

Q5. Are flange bolts suitable for marine or offshore use?

A: Yes, especially when manufactured from stainless steel 316, duplex, or other corrosion-resistant alloys.

Q6. Do you export to the USA and UK?

Introduction

In maritime engineering and marine fabrication, selecting the appropriate fastening components is paramount to ensuring structural integrity, corrosion resistance, and long-term performance. Among the vast array of fastening solutions available, 304 stainless steel machine screws stand out as a versatile and cost-effective choice. Their widespread use in marine environments stems from their reliable mechanical properties, resistance to environmental degradation, and adaptability across various marine assemblies.

This article explores the metallurgical characteristics, performance attributes, and application suitability of 304 stainless steel machine screws in marine-grade equipment.

What Are 304 Stainless Steel Machine Screws?

Machine screws are precision-threaded fasteners engineered to engage with pre-tapped holes or mating nuts. They are utilized in applications demanding controlled torque and uniform clamping pressure, particularly in metal-to-metal assemblies. When fabricated from 304 stainless steel, these screws exhibit an optimal combination of corrosion resistance and tensile strength, making them suitable for semi-corrosive marine environments, especially in topside or splash zone installations.

Material Profile: Composition & Properties of 304 Stainless Steel

304 stainless steel is a member of the austenitic AISI 300-series and is chiefly alloyed with the following elements:

Iron (Fe) – Base metal

Chromium (Cr) – approximately 18%, which promotes passivation and enhances corrosion resistance.

Nickel (Ni) – ~8% (for ductility and enhanced corrosion resistance)

Key Metallurgical and Mechanical Properties:

Corrosion Resistance: Exhibits excellent resistance to atmospheric and mildly saline conditions due to the formation of a stable chromium oxide (Cr₂O₃) passive layer.

Mechanical Strength: Ultimate tensile strength typically ranges between 515–750 MPa, providing robust fastening under mechanical loading.

Ductility and Toughness: High elongation at break (≥40%), enabling resistance to shock and vibration.

Non-Magnetic Behavior: Non-ferromagnetic in the annealed state; however, slight magnetism may develop post-cold-working.

Thermal Stability: Performs well up to moderately elevated temperatures (~870°C intermittent service), making it ideal for engine and electrical enclosures.

Why Choose 304 Stainless Steel Screws for Marine Applications?

Although 304 SS does not match the chloride pitting resistance of 316 SS (which includes 2–3% Molybdenum), it is widely specified in non-submerged or intermittently wet marine environments due to its:

Advantages:

Cost Efficiency: Lower alloying content makes it more economical than molybdenum-bearing grades like 316 or duplex stainless steels.

Extensive Availability: Compliant with global standards such as ASTM A193, DIN, and ISO, and offered in a wide range of head types, thread configurations, and dimensional specifications.

Adequate Marine Corrosion Resistance: Suitable for above-deck hardware, coastal installations, and indoor marine compartments.

Fabrication Versatility: Compatible with welding, machining, and forming processes without loss of corrosion resistance.

Marine Applications of 304 Stainless Steel Machine Screws

304 SS machine screws are integrated across numerous marine subsystems and hardware components:

1. Deck and Superstructure Hardware

Used to fasten cleats, railings, winch plates, and deck-mounted brackets.

2. Marine Engine and Machinery Assemblies

Ideal for fastening control housings, engine shrouds, pump casings, and protective equipment covers.

3. Electrical and Navigation Panels

Ensures conductive-free fastening in switchboards, marine lighting systems, and navigation control units.

4. Marina and Dock Fixtures

Suitable for weather-exposed components like dock brackets, signage plates, and structural guards.

5. Yacht and Boat Interiors

Commonly used in cabinetry, seat frame assemblies, and stainless fixtures for corrosion-free aesthetics.

Limitations in Saltwater Environments

While 304 SS offers reliable performance in aerial and splash zones, it lacks the pitting and crevice corrosion resistance required for continuous saltwater immersion or high-chloride concentrations.

For submerged applications or chemical exposure zones, opt for:

316 Stainless Steel (A4)

Duplex Stainless Steel (e.g., UNS S31803/S32205)

Super Duplex (UNS S32750/S32760)

Maintenance Recommendations for Marine Durability

Even corrosion-resistant materials benefit from basic care in marine environments:

Routine Cleaning: Rinse with fresh water post-exposure to salt spray to remove chloride residues.

Insulate from Carbon Steel: Prevents galvanic coupling that accelerates corrosion.

Apply Anti-Seize Lubricants: Especially in high-humidity zones to prevent thread galling and facilitate removal.

Periodic Inspection: Check for discoloration or early signs of corrosion and replace if necessary.

Conclusion

304 stainless steel machine screws provide an optimal balance of performance, availability, and cost for a broad spectrum of marine-grade assemblies, particularly those not subject to full immersion or harsh saline exposure. When used with appropriate design practices and maintenance schedules, they serve as reliable fasteners for both recreational and commercial maritime applications.

Whether you're engineering a yacht interior, outfitting a coastal dock, or installing deck-mounted hardware, 304 stainless steel screws remain a proven and trusted solution.

Frequently Asked Questions (FAQ)

1. Are 304 stainless steel screws appropriate for continuous submersion in marine environments?

Not recommended. While 304 SS is corrosion-resistant, continuous immersion in seawater may cause localized corrosion. 316 SS or duplex grades should be used instead.

2. Is 304 stainless steel magnetic?

In its annealed form, it is non-magnetic. However, cold working processes like forming or machining can impart slight magnetic properties.

3. How can corrosion be mitigated on 304 SS screws in marine use?

Rinse with fresh water after saltwater exposure

Avoid contact with dissimilar metals

Use protective coatings or anti-seize compounds

4. What head types and threads are available in 304 SS machine screws?

Available in multiple configurations such as:

Head Types: Pan, Flat, Round, Hex, Truss

Threads: UNC, UNF, Metric Coarse/Fine

Standards: ASTM, ISO, DIN

5. Where to source marine-grade 304 SS machine screws?