Application guide for Fine-Thread All-Metal Hex Flange Lock Nuts to ISO 12126. The core duty of the type is an all-metal prevailing torque flange nut on a fine-pitch thread for heat and vibration. The typical industries, the how-to-specify checklist, assembly practice and the exclusion cases are set out below. Stocked across roughly M8 to M20, they cover general to heavy-duty work.
Typical Applications for Fine-Thread All-Metal Hex Flange Lock Nuts
The most common settings where these are specified:
- Exhaust systems: fine-thread studs at high temperature.
- Engines: manifold and turbo fixings.
- Industrial ovens: hot fixings where nylon fails.
- Heavy vehicles: vibrating chassis joints.
How to Specify Fine-Thread All-Metal Hex Flange Lock Nuts for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M8–M20; check the full table below for the exact dimensions of each size.
- Locking & grade: Match the strength grade to the bolt, and choose a locking style (nyloc, all-metal, serrated flange) if the joint sees vibration.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to ISO 12126. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Run the nut down by hand before applying the wrench to catch cross-threading early.
- Tighten the nut rather than the bolt head where access allows — the torque-to-preload relation is more consistent.
- For locking styles, note that nyloc inserts are single-use in critical joints and lose grip above roughly 120 °C.
Common Selection Mistakes with Fine-Thread All-Metal Hex Flange Lock Nuts
- Pairing a high-class bolt with a lower-class nut — the nut strips before the bolt reaches proof load; the nut class must meet or exceed the bolt class.
- Using a plain nut with a spring washer in severe vibration instead of a prevailing-torque locking nut.
- Re-using nyloc nuts in critical joints.
Where Fine-Thread All-Metal Hex Flange Lock Nuts Are Not the Right Choice
Not on their own — they need a matching bolt or stud — and a plain nut is not a substitute for a locking type under heavy vibration.
Custom manufacturing · Made to drawing
Need a fine-thread all-metal hex flange lock nuts outside the standard range?
Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
