ISO 7040 — Prevailing Torque Type Hexagon Nuts (with Non-Metallic Insert)
Standard: ISO 7040
ISO 7040 standardizes metric hexagon nuts with a nylon insert — the prevailing-torque lock nut that grips the thread to resist vibration.
What It Covers
- Nylon insert lock nuts
- Property classes 5, 8, and 10
- Prevailing torque values
- Temperature and reuse limits