DIN 980 All-Metal Locking Nuts
DIN 980 covers all-metal prevailing-torque locking nuts — the locking action comes from the nut itself rather than a polymer insert, suiting duties where an insert isn't wanted. We supply DIN 980 nuts in steel property classes 8 and 10 across a wide range of metric sizes.
DIN 980 dimensions
| Diameter | Pitch | Height | Across Flats |
|---|---|---|---|
| M5 | 0.8mm | 5.1mm | 8.0mm |
| M6 | 1.0mm | 6.0mm | 10.0mm |
| M8 | 1.25mm | 8.0mm | 13.0mm |
| M10 | 1.5mm | 10.0mm | 17.0mm |
| M12 | 1.75mm | 12.0mm | 19.0mm |
| M14 | 2.0mm | 14.0mm | 22.0mm |
| M16 | 2.0mm | 16.0mm | 24.0mm |
| M20 | 2.5mm | 20.0mm | 30.0mm |
| M24 | 3.0mm | 24.0mm | 36.0mm |
| M30 | 3.5mm | 30.0mm | 46.0mm |
Materials & strength
All-metal deformed-thread locking
The locking action is built into the steel thread itself, so it is not limited by the temperature constraints of a polymer insert and adds no extra parts to the joint.
Steel grades 8 & 10
Property class 8 is the usual mate for grade 8.8 bolts, with class 10 used against 10.9 bolts so the nut matches the bolt strength.
What is a DIN 980 locking nut?
DIN 980 covers prevailing-torque type all-metal hexagon locking nuts. The locking action comes from a deliberately deformed section of thread rather than an insert, so the nut is one-piece steel.
How does an all-metal locking nut work?
A section of the nut thread is deformed during manufacture so it grips the bolt thread as the nut is run down. That grip gives strong resistance to loosening under vibration, and the locking feature is not limited by the temperature constraints of a polymer insert.
When should I choose DIN 980 over a nylon insert nut?
All-metal locking nuts are the usual choice where service temperature or chemical exposure rules out a nylon insert, such as hot or aggressive environments. For general ambient-temperature work, nylon insert nuts to DIN 985 or DIN 982 are the common alternative.
Can DIN 980 nuts be reused?
Reusability is condition-dependent: the grip reduces each time the nut is removed and refitted, and there is no universal cycle count. A new nut is commonly specified for critical joints.
What materials are DIN 980 nuts available in?
DIN 980 nuts are available in steel grades 8 and 10 across a wide range of metric sizes, matching the common grade 8.8 and 10.9 bolt classes.
Need DIN 980 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.