A wide conical flange under the hex spreads bearing load like a built-in washer; serrations bite the surface to resist loosening, eliminating a separate lock washer.
Conforms to

Integral serrated flange spreads load and locks against backout.
A cross-section of stocked configurations. Not exhaustive — diameters, lengths, grades, and finishes extend across the full range on request.
Representative specifications — not exhaustive · NXB-FLN
Match the line to the load, the environment, and the standard it answers to.
Materials
Finishes
Standards
Typical applications
Served industries
Mating parts and adjacent lines engineers reach for alongside this one.
Hex head with an integral flange that spreads clamp load.
M6–M20 · 1/4"–3/4"
The standard six-sided nut for threaded assemblies.
M3–M48 · #4–2"
Nylon insert ring grips threads to resist vibration loosening.
M3–M36 · #4–1-1/2"
Sprung helical ring digs in to resist vibration loosening.
M3–M30 · #6–1-1/4"
Grade, material, finish, and standard — matched to your joint and quoted from stock. Tell us the load case and we’ll confirm the line.