What are the different shapes of anti-loosening nuts?

Common Shapes and Types of Anti-Loosening Nuts

Hexagonal: The most common standard shape; includes hexagonal flange nuts, heavy-duty hexagonal nuts, etc. Some variations achieve self-locking through crimping or structural deformation.

 

12-Point Flange: Features twelve contact faces and an integrated flange base, which increases the load-bearing surface area; frequently used in demanding applications requiring high resistance to loosening.

 

Crimped-Collar: The neck of the nut is crimped inward; self-locking is achieved by generating frictional force through plastic deformation.

 

Spiralock (Wedge-Lock): Features a 30° wedge-shaped ramp at the root of the internal threads. While visually similar to a standard hexagonal nut, its unique thread geometry significantly enhances anti-loosening performance.

 

Nylon Insert: A nylon ring is embedded into one end of the nut; upon tightening, the nylon deforms to generate a radial clamping force.

 

Eccentric Structure: Consists of two eccentrically mated nuts-one convex and one concave-that work in tandem to create a wedge-locking anti-loosening mechanism.

 

Slotted: Features radial slots located at the base or top of the nut; designed to be used in conjunction with a cotter pin, constituting a mechanical anti-loosening structure.

 

Double-Stacked Self-Locking: Composed of a pair of toothed washers that generate an anti-loosening force through a wedging action.