Reliable Vibration Locking
The integrated nylon insert creates prevailing torque on the bolt thread, effectively reducing loosening caused by vibration and dynamic loads.
DIN 986 Prevailing Torque Type Hexagon Domed Cap Nuts with Non-metallic Insert
- Standard: DIN 986
- Material: Stainless Steel
- Thread Size: M4-M20
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 986 is a prevailing torque-type hexagon domed cap nut with a non-metallic insert, designed to provide reliable locking performance through a nylon insert. The enclosed dome protects the bolt thread from external contamination, while the nylon ring generates resistance against loosening caused by vibration. It is widely used in automotive, machinery, electrical equipment, and general industrial fastening applications.
DIN 986 combines the protection of a cap nut design with the anti-loosening function of a nylon insert lock nut. Compared with standard hex nuts, it provides additional thread protection and improved safety in vibration environments. The standard covers metric coarse and fine pitch threads from M4 to M20.
Draw
Specification
DIN 986 vs DIN 1587 — Key Differences
DIN 986 – Nylon Insert Lock Cap Nut
- Anti-loosening design: Integrated nylon insert provides prevailing torque and vibration resistance.
- Functional focus: Designed for secure fastening in dynamic applications.
- Typical use: Automotive, machinery, and vibration-prone assemblies.
DIN 1587 – High Crown Cap Nut
- Protective design: Fully enclosed dome protects exposed threads and improves appearance.
- Functional focus: Mainly provides thread protection and a clean finished look.
- Typical use: Decorative, safety, and general fastening applications.
Core Difference:
DIN 986 combines cap protection + locking function, while DIN 1587 provides cap protection only without anti-loosening capability.
Product Advantages
Thread Protection with Domed Design
The closed cap design covers the exposed bolt end, protecting threads from moisture, dust, and mechanical damage while improving appearance and safety.
Reusable and Cost-Effective
The nylon insert provides stable locking performance while allowing multiple assembly cycles under suitable conditions.
Common Questions
What is DIN 986 nut used for?
DIN 986 is mainly used for applications requiring both thread protection and anti-loosening performance, especially in vibration environments.
What is the difference between DIN 986 and DIN 985?
DIN 985 is a standard nylon insert hex lock nut with an open top, while DIN 986 features a closed domed cap design that protects the bolt end.
What bolts are compatible with DIN 986?
DIN 986 is designed for standard metric bolts and screws with matching thread sizes, including DIN 931, DIN 933, ISO 4014, and ISO 4017 bolts.
Can DIN 986 nuts be customized?
Yes. Manufacturers can provide customized materials, finishes, thread types, and special packaging according to customer requirements.
