Hex Flange Bolt (Thread Forming)
Hex flange bolt thread forming gives you a faster, cleaner way to build strong joints by creating threads directly in your part while our integrated flange delivers confident clamping. It cuts steps from your assembly without cutting corners on strength or reliability. Choose our thread-forming hex flange bolts when you want fewer parts, quicker installs, and vibration resistance built in.
Self-Threading Design for Strong, Reliable Joints
Our thread-forming hex flange bolts form their own mating threads in unthreaded holes, so you skip separate taps and loose washers and go straight to a secure, serviceable joint. The washer-like flange under the hex head spreads load, protects bearing surfaces, and helps resist loosening under shock and vibration.
Our hex flange thread-forming bolts shine in sheet-metal enclosures, appliance frames, HVAC brackets, automotive sub-assemblies, racking, and electronics—anywhere you want speed, strength, and a reliably tight joint without separate tapped holes.
If you need standard fasteners for pre-tapped holes, explore our Hex Flange Bolts; for extra anti-rotation bite on painted or plated surfaces, see our Hex Flange Bolt Serrated.
DIN 7500D: The Standard Behind Our Performance
Our DIN 7500D thread-forming hex flange bolts are engineered to plastically displace material and create precise internal threads as they drive, producing a chip-free, high-grip connection. The hex head speeds tool engagement, while the built-in flange increases bearing area for stable clamp load and reduced risk of crush or pull-through.
Materials and Hole Prep
Use our thread-forming bolts in ductile materials such as low- to medium-carbon steels, aluminum, and select engineering plastics. Specify the correct pilot hole size per DIN 7500D and your substrate; it will be slightly smaller than the fastener’s minor diameter to allow controlled material flow and full thread formation. Proper hole quality (round, burr-free, correct depth) is key to repeatable torque-to-failure ratios.
Installation Tips for Stronger Joints
Drive our bolts perpendicular to the work with steady speed and consistent pressure. You’ll feel a brief rise in torque as threads form, followed by a smooth run-down to seating; then simply torque to spec. The flange removes the need for a separate washer, streamlining kitting and reducing BOM complexity. In tougher materials, a light compatible lubricant can lower drive torque and extend tool life.
FAQs
How does thread forming work?
Thread forming displaces material rather than cutting it. As our bolt advances into a properly sized pilot hole, its forming lobes reshape the hole into a matching internal thread profile. Because no chips are produced, the new internal threads are work-hardened and often offer excellent strip and vibration resistance.
Are hex flange bolts fully threaded?
They can be either, depending on size and application. Many thread-forming variants are fully threaded to maximize engagement in thin sections, while larger or specialty parts may use partial threading to manage strength and alignment. We’ll help you choose the right configuration for your stack-up.
Can thread forming screws be reused?
For critical joints, reuse isn’t recommended. The formed internal threads and the fastener’s forming features can wear with repeated cycles, which may reduce holding power. If service is expected, plan for replacement fasteners or validate reuse through torque-tension testing on your specific assembly.
What does 2A and 2B mean for threads?
Those are Unified thread fit classes: 2A describes a typical “commercial” fit for external threads (like a bolt), and 2B is the corresponding fit for internal threads (like a nut or tapped hole). They define tolerances and clearance so parts assemble smoothly while maintaining adequate strength and clamp load.