STAINLESS STEEL BUMAX ALL METAL SELF LOCKING COLLARED NUTS

Bumax All Metal Self Locking Flanged Nuts — This design folds three functions into one component: Bumax's high-tensile A4/316 material, an all-metal locking mechanism, and an integral flange that spreads the clamping load over a wider bearing area than a standard hexagon nut. That combination suits assemblies where reducing part count matters as much as performance — equipment panels, transport and vehicle-body fixings, marine hardware, and machinery covers where a separate flat washer would otherwise be needed to protect a soft or uneven joint face, and where vibration resistance and corrosion resistance both need to be designed in at once. The flange increases the bearing footprint under the nut, which can remove the need for a separate washer in many assemblies, though a dedicated washer may still be worth adding where the joint surface is particularly soft, uneven, or where load-spreading requirements exceed what the flange alone provides. The locking element works the same way as other all-metal self-locking nuts in the range, gripping the bolt thread through a deformed thread form or friction-collar effect rather than a nylon insert, so it retains its function in hot, oily, or chemically aggressive conditions that would degrade a standard nyloc-type flanged nut. Choosing this over a standard serrated or nylon-insert flanged nut comes down to whether the joint genuinely needs Bumax's combined strength and corrosion performance — for a lightly loaded, sheltered assembly, a standard flanged nut is the more economical choice, but where vibration, load, and a corrosive environment all coincide, the single-component approach reduces both cost and complexity compared with specifying a separate nut, washer, and lock washer. As with the rest of the range, no-galling manufacturing lets the nut be run down to full torque without seizing, and sizing should match thread diameter and pitch to the bolt while checking the flange outside diameter clears any surrounding fixtures or counterbore.

FAQs
Does the flange fully replace the need for a separate washer?
Often, but not always — the flange spreads load over a wider area than a plain nut face, which covers most standard assemblies, but a particularly soft, uneven, or heavily loaded joint surface may still benefit from an additional dedicated washer.

When is this combined nut/washer/locknut design not the right choice?
Where the joint is lightly loaded, dry, and rarely disturbed, specifying a standard flanged or nylon-insert nut is usually cheaper and just as effective — the combined Bumax design earns its cost specifically when vibration, load, and corrosion resistance all need addressing together.

Does the flange affect spanner or socket clearance?
The flange sits below the hexagon and doesn't change the across-flats drive size, but its larger outside diameter should be checked against any surrounding fixtures, counterbores, or tight component spacing before specifying it in place of a standard nut.