din985 m2 m2.5 m3 m4 m5 m6 black hex nylon insert lock nut self-locking locknut customization available

black finish: coated with a black finish, providing an aesthetic appearance while also potentially offering some level of corrosion resistance.material: typically made from carbon steel or other suitable metals, offering strength and durability. features a hexagonal shape with six flat sides, allowing for easy tightening or loosening using a wrench or other tools. contains internal threads that match a specific size, ensuring a secure and reliable fastening onto bolts or threaded rods..syi