Flanged Hexagon Bolt Thread Forming Screws.

What are Flanged Hexagon Bolt Thread Forming Screws?

Flanged hexagon bolt thread forming screws are trilobular, self-thread forming fasteners designed to create strong, vibration-resistant threads in host materials without the need for pre-tapped holes. The hexagon head allows positive drive with spanners or sockets, while the integral flange spreads the clamping load over a wider surface area, reducing the risk of pull-through or surface damage.

How Flanged Hexagon Bolt Thread Forming Screws Work

These flanged hexagon bolt thread forming screws use a trilobular shaft profile to cold form mating threads as they’re driven. Instead of cutting material away, creating swarf, the lobed geometry displaces it to create a precisely matched internal thread. The result is high strip-out resistance, excellent vibration performance and consistent prevailing torque.

Because the head is hexagonal, installers can use handheld spanners, nut-setters or power drivers with standard hex sockets, making them ideal for production lines and maintenance settings where access or alignment varies. The flange under the head behaves like a built-in washer, increasing bearing area and improving joint stability, especially on softer or thinner substrates.

For example, when fixing a small gearbox to a thin aluminium panel, the trilobular shaft forms precise threads in the host material while the flanged head spreads the clamping load to protect the surface, and the hexagon drive lets installers apply reliable, higher torque using standard sockets or nut-setters.

Materials Flanged Hexagon Bolt Thread Rolling Screws Are Made From

Accu's selection of flanged hexagon bolt thread rolling screws is supplied in steel with plating to suit the environment and appearance required:

• Steel with Bright Zinc Plating (BZP): General-purpose corrosion protection with a clean, bright finish for indoor assemblies and controlled environments.
• Steel with Black Zinc Plating: Similar protective performance with a low-gloss black aesthetic to reduce glare or for visual matching in equipment enclosures.

Sizes and Types of Flanged Hexagon Bolt Thread Forming Screws Available

Our range covers metric thread sizes from M3 (3mm) to M10 (10mm) with lengths from 6mm to 60mm. All variants feature a hexagon head with an integral flange and a trilobular thread-forming shaft for reliable performance in plastics, thin composites and light metals.

Selection typically centres on required clamp load (head size), engagement depth (length) and substrate thickness; installers can choose the size that matches their torque window and the host material’s strength.

FAQs

Q: Do I still need a washer when installing flanged hexagon head thread rolling screws?

A: Usually no. The flange increases bearing area and often replaces a separate washer, helping to control surface pressure and speeding up assembly.

Q: What tools are recommended to install flanged hexagon bolt thread forming screws?

A: Standard hex sockets or nut-setters with torque control. The hex head helps achieve higher, more repeatable torque than cross-recess drives, especially in production.

Q: How do they compare with thread cutting screws?

A: Thread forming screws displace material rather than cut it, which typically yields higher pull-out strength, better vibration resistance and less debris in the assembly.

Q: Will the flange mark painted or coated surfaces?

A: It can if the finish is delicate. To protect finishes, ensure correct torque, consider a protective film during assembly or validate with your coating specification.

Bespoke Flanged Hexagon Bolt Thread Forming Screws Manufacture.

High precision, bespoke manufacture of Flanged Hexagon Bolt Thread Forming Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.