Serrated Flange Lock Nut with Stepped Threaded Bore for Rail and Track Fastening

Product Description:

Qimao Metal Manufacturer Serrated Flange Lock Nut with Stepped Threaded Bore for Rail and Track Fastening the thread sizes run from M4 to M12, though M6 and M8 are what we ship most. The stepped bore creates a shoulder inside the nut that helps with alignment when you’re mounting onto a part with a pilot or recess. Material is SAE 1008 or 1010 carbon steel, cold-formed rather than machined from bar stock. Zinc plating with clear trivalent passivation is our default finish, about 5 to 8 microns thick, good for 72 hours of salt spray without red rust. Hardness runs around HRB 70 to 80. The serrations are rolled, not cut – rolling work-hardens the teeth so they hold their edge longer through repeated installations. We check prevailing torque on random samples from each lot, targeting 0.5 to 1.0 N·m on first install depending on thread size.

Specification:

Products Details:

The Serrated Flange Lock Nut with Stepped Threaded Bore for Rail and Track Fastening pattern is we use a 60-degree included angle on each tooth with an undercut at the root, so the teeth displace rather than cut into the mating surface. No metal shavings floating around your assembly. We ran tests against standard DIN 6927 flanged nuts and found about 30% higher vibration resistance. The flange diameter runs about 2.5 times the nominal thread size, spreading clamp load across a wider area – helpful when fastening into aluminum extrusions or thin sheet metal. The step ed bore creates a positive stop when the nut reaches a certain depth, preventing over-tightening into blind holes. We’ve also made sure the step diameter clears the pilot on most standard rail fittings, so installers don’t have to hand-select nuts for specific tracks.

Product Feature:

• Serrated Flange Lock Nut with Stepped Threaded Bore for Rail and Track Fastening eliminates the need for a separate lock washer, reducing assembly steps.

• Stepped threaded bore provides positive depth stop and aids alignment with pilot features.

• Rolled serrations work-harden the teeth for consistent locking across multiple installations.

• Zinc plating with trivalent passivation offers corrosion resistance up to 72 hours salt spray.

• Cold-formed construction preserves grain flow, giving better fatigue resistance than cut threads.

• Prevailing torque retention keeps the nut in place under continuous vibration or cyclic loading.

Product Application:

• Sliding door track systems – the Serrated Flange Lock Nut with Stepped Threaded Bore for Rail and Track Fastening rides flush against the rail and the serrations stop the nut from walking back when doors slide back and forth.

• Window hardware fittings – compact enough to fit in narrow channels without protruding beyond the frame profile.

• Conveyor rail assemblies – where equipment runs continuously and any loose fastener would shut down the line.

• Furniture track systems – office partitions, sliding wardrobe doors, stuff like that where you need a low-profile fastener that won’t come undone from repeated use.

• Automotive seat rails – tested for this application, though we don’t supply directly to automakers, just to their tier suppliers.