150 Pcs M4 DIN 985 Nylon Insert Hex Lock Nuts, Black Carbon Steel, Metric M4 for Furniture & Appliance Repair, Machinery Maintenance, Bicycles, Motorcycles, Automotive DIY

• Exquisite Material: Made from high‑quality black carbon steel with smooth, burr‑free surfaces. Strong, hard‑wearing, corrosion‑resistant and rust‑proof to ensure long‑lasting performance.
• DIN 985 Nylon Insert: Each hex self‑locking nut features a durable nylon insert (DIN 985) that increases friction with the threads to resist loosening from vibration and torque, helping maintain a secure hold.
• Practical, Safe Design: The nylon insert deforms elastically around the screw threads without being cut by them, reducing accidental loosening, protecting exposed threads and improving overall safety and stability.
• Wide Applications: Ideal for electrical appliances, precision machinery, computers, furniture, vehicles, sheet metal work, bicycles and general maintenance projects—suitable for professionals and DIY users.
• Package Contents: 150 pcs of M4 nylon lock nuts (single size, black). Supplied in a handy organiser box for easy storage and transport.

What are the advantages of our black M4 nylock nuts? 1.Hexagon nut self-locking are made of high-quality carbon steel material, are not easy to deform and break, corrosion-resistant, rust-proof and durable. 2.Nylon inserts are provided inside the lock nut (DIN 985), which can significantly reduce vibration and loosening under torque. 3.Assorted locking nuts are housed in a storage box and can therefore be easily stored and transported. 4.Widely used in various industries such as electrical appliances, precision machinery, computers, furniture, vehicles, sheet metal, aircraft and other fields. Features: Material: Carbon Steel Color: Black Quantity: 150 pieces Package includes: 150 pieces - M4 After-sales guarantee: If you have any questions about the nylon lock nuts, please contact us in time, we will solve your questions as soon as possible. Warm Tips: Color may vary slightly from the online image due to your monitor's color settings. Please refer to the actual product. Thank you for your understanding.