These are lobed operating knobs made up of a black nylon knob available in several head diameters, namely 28 mm,32, 39, 42, 55 and 62 mm, as well as a zinc-plated steel nut. These are the BPF 280/320/390/420/550 and 620 models.
These knobs have lobes giving them a good grip and optimal comfort for assemblies requiring regular adjustments. Durable and chemical resistant, they provide a clean, finished look.
These parts are offered in black nylon fine grain matte surface. These products are available as standard with insert in zinc-plated steel, stainless steel, brass, and polyamide.
These lobed knobs are to be used for assemblies requiring regular adjustments: frequent screwing and unscrewing.