Stainless Steel Hex Flange Bolt Titanium Flange Bolts Brass Bronze Flange Bolts

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Stainless Steel Hex Flange Bolt Titanium Flange Bolts Brass Bronze Flange Bolts

What is a Hex Flange Bolt?

A flange bolt is a type of fastener that features an integrated flange (a wide, circular ridge) beneath the bolt head. This flange distributes clamping pressure over a larger surface area, eliminating the need for a separate washer. Flange bolts are commonly used in applications requiring vibration resistance and secure fastening.

Materials of Hex Flange Bolts

Flange bolts are made from various materials depending on strength, corrosion resistance, and application requirements:

Carbon Steel (Grade 2, 5, or 8) – Standard strength, economical, used in general applications.
Alloy Steel (AISI 4140, 4340) – High strength, heat-treated for heavy-duty use.
Stainless Steel (A2/304, A4/316) – Corrosion-resistant, ideal for marine and chemical environments.
Titanium – Lightweight, high strength-to-weight ratio, used in aerospace.
Brass/Bronze – Non-magnetic, corrosion-resistant, used in electrical and plumbing applications.

Surface Treatments

To enhance durability and corrosion resistance, flange bolts undergo various surface treatments:

Zinc Plating (Electro-galvanized or Hot-Dip Galvanized) – Provides rust resistance (common for outdoor use).
Black Oxide – Improves corrosion resistance and reduces glare (used in automotive/military).
Phosphate Coating – Enhances lubricity and corrosion resistance (often used with oil coatings).
Dacromet/Geomet Coating – Superior corrosion protection for harsh environments.
Nickel/Chrome Plating – Decorative and corrosion-resistant (used in automotive and appliances).

Common Specifications

Flange bolts come in various sizes, thread types, and standards:

Thread Types:
Coarse Thread (UNC) – General-purpose fastening.
Fine Thread (UNF) – Used where vibration resistance is critical.
Metric Thread (M6, M8, M10, etc.) – Common in European/Asian machinery.
Head Types:
Hex Flange Head (Most common)
Serrated Flange Head (Anti-loosening grip)
12-Point Flange Head (Aerospace applications)
Standards:
ANSI/ASME B18.2.1 (US Standard)
DIN 6921 (German/European Standard)
ISO 4162 (International Standard)

Flange Bolt Chart 300 (Metric & Inch Series)

Applications of Flange Bolts

Flange bolts are widely used in industries requiring vibration resistance and secure fastening:

Automotive: Engine mounts, transmission systems, chassis assembly.
Construction: Steel structures, bridges, heavy machinery.
Aerospace: Aircraft frames, landing gear assemblies.
Marine: Shipbuilding, offshore platforms (stainless steel variants).
Industrial Machinery: Pumps, compressors, hydraulic systems.
Electronics/Appliances: Securing panels and components.

Flange bolts are versatile fasteners designed for high clamping force and vibration resistance. Their integrated flange eliminates the need for washers, making them ideal for automotive, construction, and industrial applications. Material selection and surface treatment depend on environmental conditions and load requirements.