STAINLESS STEEL NON SERRATED FLANGED NUTS DIN 6923

Non Serrated Flanged Nuts DIN 6923 — DIN 6923 carries the same integral flange as its serrated sibling — replacing a separate flat washer and spreading clamp load over a wider bearing area than a standard hex nut — but with a smooth underside that relies on standard thread friction and correct torque rather than any surface bite. That makes it the right choice wherever the serrated version's teeth would be a problem: painted, plated, powder-coated, or otherwise finished surfaces that need to stay cosmetically intact, softer materials that shouldn't be gouged, or assemblies where the mating component will be disassembled and reused often enough that surface marking would accumulate. It's also the more appropriate flange nut where the joint sits over an oversized or slightly misaligned clearance hole, since the wider bearing area matters more there than any anti-rotation grip. Because there's no locking feature at all — no serration bite, no nylon insert — DIN 6923 behaves exactly like a standard hex nut in terms of vibration resistance, and a joint that needs genuine locking as well as load spreading should move up to the nylon insert flange nut (DIN 6926) instead. It's a straightforward specification decision: use this where the flange's washer-replacement function is wanted but the surface must stay undamaged, and use the serrated version where a surface grip is more valuable than a pristine finish. A2 stainless handles the majority of general engineering and automotive use; A4 is the better choice for outdoor, marine, or washdown environments, and matters somewhat more here than with a serrated flange nut since a smooth flange offers no mechanical backup if corrosion eventually affects thread friction. Sizing and thread pitch follow the mating bolt exactly, with flange diameter scaling with nominal thread size in the same way as the serrated version.

FAQs
Does DIN 6923 offer any anti-rotation benefit at all?
No, it relies purely on standard thread friction and correct torque, exactly like a plain hex nut; any anti-rotation performance comes only from correct torque and, where needed, a separate locking method.

When is the serrated version a better choice instead?
Where the mating surface isn't coated or cosmetically sensitive and some extra resistance to loosening is welcome without adding a nylon insert or lock washer, the serrated version is generally the better default.

Why use a flange nut instead of a standard nut with a separate washer?
A flange nut combines the nut and washer function in a single component, reducing part count and assembly time while providing a consistent bearing surface diameter.

Is DIN 6923 suitable for a joint that will be repeatedly disassembled?
Yes — because there's no serration to wear down and no nylon insert to degrade, it can be removed and refitted repeatedly with no change in performance, unlike a serrated or nylon-locking flange nut.