Flanged Hex Nuts combine a standard hex nut with an integrated, wide bearing flange. This design eliminates the need for a separate washer, simplifying assembly and providing superior load distribution across a larger surface area. They are particularly effective for use with oversized holes, thin or soft materials, and uneven surfaces.
There are two primary types, distinguished by their locking mechanism:
Serrated Flange Nuts: Feature serrations (teeth) on the underside of the flange. These bite into the mating surface to provide resistance against loosening caused by vibration, making them a value-engineered alternative to a standard hex nut plus a separate lock washer.
Non-Serrated (Plain) Flange Nuts: Have a smooth bearing surface. They are used when the primary requirement is load distribution and a flush, non-marring contact with the material surface is necessary.
The international standard functionally equivalent to DIN 6923 for serrated flange nuts is ISO 4161.
Feature |
Serrated Flange Nut |
Non-Serrated (Plain) Flange Nut |
| Primary Function | Vibration resistance and load distribution. | Load distribution and surface protection. |
| Locking Action | Serrations bite into the contact surface to resist rotation. | Provides no inherent locking action; relies on proper torque and thread friction. |
| Surface Impact | May mar or leave indentations on soft surfaces. | Non-marring; ideal for finished or delicate surfaces. |
| Reusability | Good, but locking performance may diminish slightly after repeated use. | Excellent, with no degradation of the bearing surface. |
| Best For | Applications subject to mild vibration (e.g., automotive trim, machinery panels). | Applications requiring a clean finish, frequent disassembly, or where surface damage is unacceptable. |
The choice of material determines the nut's strength, corrosion resistance, and suitability for different environments.
Material |
Key Characteristics |
Ideal Application |
Considerations |
| Zinc-Plated Steel | Cost-effective with basic corrosion resistance. Suitable for occasional moisture exposure. | General indoor use, dry or controlled environments. | Plating can wear. Not for continuous outdoor or corrosive environments. |
| 18-8 (A2) Stainless Steel | Good corrosion resistance, resists rust from water and mild chemicals. | Outdoor fittings, marine interiors, and damp industrial environments. | Offers the best balance of corrosion resistance and cost for most general-purpose applications. |
| 316 (A4) Stainless Steel | Excellent corrosion resistance, withstands harsh weather, saltwater, and most chemicals. | Marine exteriors, chemical processing, coastal architecture, and highly corrosive environments. | Premium material for maximum durability and longevity in aggressive conditions. |
Drive: Requires a standard wrench or socket on the hexagonal body.
Installation: Both types are installed by tightening the nut, with serrated nuts requiring slightly higher initial torque to engage the teeth.
Note: Always ensure the flange nut material is compatible with the bolt/boss material to avoid galvanic corrosion.
| CLICK VIEW ONLINE | DIN 6923 Dimensions | DIN 6923 weight chart |
| CLICK DOWNLOAD | DIN 6923 Dimensions pdf | DIN 6923 weight chart pdf |
PIC |
PRODUCT |
SIZE |
GRADE |
FINISH |
THREAD |
 |
Serrated Flanged Hexagon Nuts (DIN 6923) - Stainless Steel (A2) | M3-M16 | A2 Grade | Natural | Coarse |
|
Serrated Flanged Hexagon Nuts (DIN 6923) - Marine Stainless Steel (A4) | M4-M12 | A4 Grade | Natural | Coarse |
|
Serrated Flanged Hexagon Nuts (DIN 6923) - Bright Zinc Plated Steel (Class 6) | M3-M20 | Class 6 | Zinc CR3 | Coarse |
|
DIN 6923 Hex Flange Nuts Serrated Class 8 Zinc | M3-M20 | Class 8 | Zinc CR3 | Coarse |
|
DIN 6923 Hex Flange Nuts With Serration Class 8 Black Oxide | M4-M20 | Class 8 | Black Oxide | Coarse |
|
DIN 6923 CLASS 10 HEX FLANGE NUT WITH SERRATION MEDIUM CARBON STEEL ZINC PLATED | M6-M20 | Class 10 | Zinc CR3 | Coarse |
|
Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration | M6-M20 | Class 10 | Black Oxide | Coarse |
