These are maneuvering knobs with lobes made up of a black nylon knobs available in several head diameters, namely 28, 32, 39, 42, 55 and 62 mm as well as a zinc-plated steel screw. These are the BPF 280/320/390/420/550 and 620 models.
These buttons 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 a matte, fine-grained black nylon surface. We have a tolerance on the useful length of +/- 1 mm on all of our references.
These lobe knobs are to be used for assemblies requiring regular adjustments: frequent screwing and unscrewing. A lock nut is recommended when using the end of the screw.