Made of carbon steel with a black zinc-plated finish for high hardness and good corrosion resistance. The built-in nylon insert provides prevailing torque to resist loosening under vibration and repeated load.

Used in conjunction with M4 bolts/screws (and optionally washers) to securely fasten parts when mechanically joining materials together.

Widely used in machinery, instruments, electronic products, 3D printers, RC models, home appliances, furniture, garage projects, ship assembly, and more.

Product Specifications:
Material: Carbon Steel (with nylon insert)
Finish: Zinc Plated (Black)
Color: Black
Type: Nylon Insert Self-Locking Hex Nut (Nyloc)
Thread Size: M4
Thread Pitch: 0.7 mm / 0.028"
Width (Across Flats): 7.0 mm / 0.28"
Height: 5.0 mm / 0.20"
Locking Method: Nylon prevailing-torque insert
Note: Not recommended for high-temperature applications (the nylon insert may soften at elevated temperatures).