Metal Insert Self Locking Nut (DIN 980M)
What is DIN 980 M?
DIN 980 M specifies a type of all-metal prevailing torque lock nut that features an embedded, heat-treated metal insert (or locking ring) near its top. This insert has an inner diameter slightly smaller than the bolt thread. When the nut is tightened, the metal insert deforms over and grips the mating bolt threads, creating a strong locking action that resists loosening under vibration. Also known as a Metal Insert Self-Locking Nut, it is designed for high-temperature applications (retaining effectiveness up to approximately 400°C/750°F) and is highly reusable, as the metal insert is not damaged during installation or removal.
What are the key differences between DIN 980 V and DIN 980 M lock nuts in terms of locking form, principle, and reusability?
The primary differences lie in their construction and locking mechanism, as summarized below:
Aspect |
DIN 980 V (Type V) |
DIN 980 M (Type M) |
|
Locking Form |
A single-piece nut with a permanently deformed top section. Common forms include ： end face three-point type, elliptical type, side extrusion type. |
A nut with a separate, embedded metal insert or locking ring near the top. |
|
Locking Principle |
Locking is achieved by the controlled deformation of the nut's own top threads during manufacturing. This creates an interference fit with the bolt, generating high frictional resistance. |
Locking is provided by the elastic deformation of the independent metal insert. The insert's smaller inner diameter grips the bolt threads radially to prevent rotation. |
|
Reusability |
Limited reusability. The deformed threads can be worn down over repeated installations, gradually reducing the prevailing torque. |
Excellent reusability. The hardened metal insert is highly durable and typically does not sustain damage from the bolt threads, allowing for multiple reuses with consistent locking performance. |
What is the ISO equivalent standard for DIN 980 M?
The international standard that is functionally equivalent to the DIN 980 M all-metal prevailing torque lock nut with a metal insert is ISO 7042.
DIN 980 Mechanical properties
Material Category |
Performance Grades (Typical) |
Key Performance Requirements |
Acceptance Criteria (Applicable Standards) |
| Carbon Steel | Grade 8, Grade 10 | 1. Proof Load & Hardness: Must meet the specified requirements for the corresponding grade. 2. Locking Performance: Must meet prevailing torque requirements after repeated installation. |
1. Mechanical Properties: ISO 898-2 (Proof load, hardness, etc.) 2. Locking Performance: ISO 2320 (Prevailing torque test after 5 on/off cycles) |
| Stainless Steel | Grade 70 (A2-70) |
1. Proof Load: Must meet the specified requirements for the corresponding grade. 2. Locking Performance: Must meet prevailing torque requirements after repeated installation. 3. Hardness: Not a mandatory requirement. |
1. Mechanical Properties: ISO 898-2 (Proof load requirement only) 2. Locking Performance: ISO 2320 (Prevailing torque test after 5 on/off cycles) |
Download DIN 980M Dimensions pdf and DIN 980M Weight Chart or views online
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Active Stock List (All items are currently in stock)：
PIC |
PRODUCT |
SIZE |
GRADE |
FINISH |
THREAD |
 |
Hexagon nut, self-locking, DIN 980, stainless steel A2, plain | M3-M16 | A2 Grade | Natural | Coarse |
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Hexagon nut, self-locking, DIN 980, stainless steel A4, plain | M3-M16 | A4 Grade | Natural | Coarse |