Metric DIN 985 nylon insert lock nuts low profile are prevailing torque type lock nuts which have a permanent undersized non metallic insert nylon/polyamide) that produces friction between threads of mated components thereby increasing the resistance to loosening forces. Nylon insert lock nuts may be re-used a limited number of times because the threads of the mating bolt deform but do not cut into the polymer insert. These nuts are considered one-way lock nuts because they can only be installed one-way—top up. The nylon insert limits the use at elevated temperatures or when exposed to certain chemicals. BRK Industries offers one of the most complete ranges of metric studs and other inch and metric industrial fasteners for immediate delivery from stock. The following sizes of metric DIN 985 nylon insert lock nuts are available for immediate shipping from stock: Diameters ranging from M2.5 to M30 in A2 and marine grade A4 stainless steel as well as brass and steel. View parts by clicking on the following link: Nylon Insert Hexagon Lock Nut DIN 985