Hex Head Flange Bolts

Hex Head Flange Bolts – Precision Fastening Solutions by G-Fast

In demanding environments where vibration, load distribution, and joint security matter, standard bolts often need a washer to perform reliably. Hex head flange bolts solve that problem by design. With a built-in bearing flange beneath the head, these bolts distribute the clamping load over a wider area eliminating the separate washer, reducing assembly time, and delivering a more secure connection from the outset.

At G-Fast, we manufacture hex head flange bolts to both standard specifications and custom requirements. Whether you need a catalogue size or a print-specific configuration, our in-house production capability means you get exactly what your application demands.

What Makes a Hex Head Flange Bolt Different?

A hex head flange bolt is a six-sided (hexagonal) headed bolt with an integrated circular flange — a wide, flat ring — located between the head and the bearing surface. This flange performs the function of a washer, but as a permanent, non-removable part of the fastener itself.

Two flange styles are available:

• Plain flange - smooth underside, ideal for general industrial and structural use.
• Serrated flange - small teeth on the flange face bite into the mating surface under torque, providing positive resistance to loosening caused by vibration or shock.

The serrated variant is widely specified in automotive, agricultural machinery, and industrial frame assembly — any application where bolt loosening from vibration is a real-world risk.

Industries & Applications

Hex head flange bolts are relied upon across a range of critical industries:

• Automotive & Transportation - engine assemblies, chassis, suspension, exhaust systems
• Agricultural Machinery - frames and structural joints exposed to constant vibration
• Industrial Equipment - pumps, compressors, conveyor frames, and gearboxes
• Construction & Infrastructure - structural steel connections and modular assemblies
• Aerospace & Defence - custom-spec fasteners where weight, grade, and certification matter

Why Choose G-Fast?

G-Fast is not just a distributor. We manufacture and that distinction matters when your project moves beyond catalogue sizes.

• USA-Made Quality - all fasteners produced under rigorous quality control in American facilities
• Custom to Print - we work from your CAD drawings, samples, or specification documents
• Small Batches & Production Runs - no minimum order size forces; we support both
• Expedited Service - available for time-critical procurement when your line cannot wait
• Engineering Support - our team reviews your application and recommends the right grade, finish, and configuration before you commit

Tell us your specification diameter, grade, quantity, and any custom requirements and we will come back to you with a competitive price and lead time. G-Fast supplies both small batch and high-volume orders with no compromise on quality or turnaround.

Contact G-Fast today or request a quote online. Standard and custom hex head flange bolts - manufactured in the USA

Frequently Asked Questions

Do I still need a washer with a hex head flange bolt?

No. The integrated flange replaces the function of a flat washer by spreading the clamping load over a wider area. For most applications, a separate washer is unnecessary.

What is the difference between serrated and plain flange bolts? Serrated flanges have teeth on the bearing face that grip the mating surface under torque, providing

vibration resistance. Plain flanges offer a cleaner appearance and are used when the mating surface must not be marred.

Can G-Fast manufacture hex flange bolts to a custom specification?

Yes. We manufacture to customer-supplied drawings, prints, or samples — including non-standard diameters, thread pitches, head heights, and reduced-shank configurations.