DIN 980 All-Metal Lock Nut
DIN 980 All-Metal Lock Nut
DIN 980 / ISO 7042 all-metal lock nuts provide prevailing-torque locking through deformation of the upper thread section, with no polymer insert, making them suitable for higher service temperatures than nylon-insert lock nuts. sinofastener supplies all-metal lock nuts in carbon steel class 5–10 and stainless A4-80 (316), thread range M8–M30, for high-temperature and vibration-prone bolted joints.
What Is a DIN 980 All-Metal Lock Nut?
Anall-metal lock nutperISO 7042(formerlyDIN 980) achieves locking through controlled elastic deformation of the top threads, creating prevailing torque that resists loosening under vibration. Because locking is achieved entirely in metal, it can be used at higher temperatures than nylon-insert designs, making it a common choice for engine room exhaust, pump, compressor and valve joints where heat and vibration act together.
Marine Applications
Note: Application list based on typical industry practice for all-metal lock nuts; final service temperature per project and material.
| Application | Serving |
|---|---|
| Exhaust & hot piping | High-temperature anti-loosening |
| Pumps & compressors | Vibration-prone joints |
| Engine room machinery | Where nylon insert not suitable |
| Valve & actuator flanges | Retained preload under heat |
Specifications & Materials
| Parameter | Range | Standard Reference |
|---|---|---|
| Thread size | M8–M30 | ISO 7042 / DIN 980 |
| Carbon steel class | 5, 8, 10 | ISO 898-2 |
| Stainless class | A4-80 (316) | ISO 3506-2 |
| Locking type | All-metal, prevailing torque | ISO 7042 |
| Certificate | EN 10204 3.1 / 3.2 on request | EN 10204 |
Why Choose sinofastener for All-Metal Lock Nuts?
1. Supplied to ISO 7042 / DIN 980 with prevailing-torque locking.
2. Suitable for higher temperatures than nylon-insert designs.
3. Carbon steel or A4 stainless matched to service corrosion needs.
4. EN 10204 3.1 / 3.2 documentation on request.
Standards Reference
- ISO 7042 — Prevailing torque type all-metal hexagon nuts, property classes 5, 8 and 10
- DIN 980 — Former designation for all-metal lock nuts
- ISO 898-2 — Mechanical properties of nuts
- ISO 3506-2 — Mechanical properties of corrosion-resistant stainless steel nuts
- EN 10204 — Metallic products, types of inspection documents
FAQ
Q1: What is the difference between all-metal and nylon-insert lock nuts?
An all-metal lock nut achieves prevailing torque through metal thread deformation, allowing higher service temperatures than nylon-insert designs, where the polymer limits temperature.
Q2: What materials are available?
Carbon steel classes 5, 8 and 10 per ISO 898-2, or stainless A4-80 (316) per ISO 3506-2.
Q3: Where are they used?
High-temperature and vibration-prone joints such as exhaust pipes, pumps, compressors and engine room machinery where a nylon insert cannot be used.
Q4: Can you provide material certificates?
Yes. EN 10204 3.1 as standard for qualified items; 3.2 subject to PO and class requirement.
Contact Us
Email: sales@sinofastener.com | bobo@sinofastener.com
Tel: 0574-86592068
Website: www.zlfastener.com | www.sinofastener.com (Main)
