STAINLESS STEEL NYLON INSERT SERRATED FLANGE NUTS DIN 6926

Nylon Insert Serrated Flange Nuts DIN 6926 — This version of DIN 6926 stacks two independent locking mechanisms onto the same flange-nut base: a nylon collar inside the nut body that grips the bolt thread continuously, generating prevailing torque regardless of clamp tension, and serrations under the flange that bite into the mating surface as the nut tightens down. Neither mechanism depends on the other, which is the point — in a genuinely demanding vibration environment, having two independent ways to resist loosening is more robust than relying on either alone, and that's why this combination turns up heavily in automotive suspension and engine assemblies, off-highway and agricultural machinery, and any joint subject to continuous vibration where a single locking feature has proven insufficient in service. The obvious cost of the serrated flange is that it marks whatever surface it's tightened against, so where the mating face is coated, painted, or otherwise cosmetically sensitive, the non-serrated DIN 6926 (nylon insert without serration) keeps the polymer lock but drops the surface bite. As with any nyloc-type nut, the nylon insert can be reused a limited number of times before its grip weakens with each removal and refitting, and standard nylon's temperature ceiling still applies — an all-metal locking flange nut is the better choice for hot environments, though those are less commonly available in this specific flanged, serrated configuration. A2 stainless suits general automotive and machinery use; A4 is worth the extra cost for anything exposed to road salt, marine air, or washdown chemicals, particularly given how often this nut ends up in undercarriage or exposed chassis positions. Sizing follows the mating bolt's diameter and pitch as with any nut, with flange dimensions scaling to nominal thread size in the usual way.

FAQs
Is the combination of nylon insert and serration ever overkill?
For a joint with only mild vibration, a single locking method (nylon insert alone, or serration alone) is often enough and cheaper; this combined version earns its cost specifically in continuous, higher-vibration applications where a single mechanism has proven insufficient.

How does this compare to the non-serrated DIN 6926 flange nut?
Both use the same nylon insert locking principle and flange, but the serrated version adds a mechanical bite into the mating surface for additional resistance to loosening, at the cost of potentially marking the surface.

Does removing and refitting this nut affect both locking mechanisms equally?
No — the serrations show gradual wear each time they re-bite a surface, but it's the nylon insert that degrades faster and is the limiting factor on how many times the nut can be safely reused before replacement.

What's the practical downside of using this nut on a finished or coated component?
The serrations will mark or scuff the coating at the contact point every time the nut is tightened, so a coated surface that must stay cosmetically intact should use the non-serrated version instead.