Precision grade locking nut

Precision grade locking nut

Precision grade locking nut is a type of nut widely used in industries such as machinery, mainly used to prevent nut loosening and ensure connection reliability. Here is a detailed introduction:

working principle

The self-locking is mainly achieved by increasing the friction between the nut and bolt, and partially by improving the structural design to obtain its own locking function, thereby preventing the nut from loosening under vibration, impact and other working conditions.

category

Double nut locking: Use two identical nuts to tighten onto the same bolt, and apply a tightening torque between the two nuts to ensure a reliable bolt connection.

Special nut with anti loosening gasket: It needs to be used together with a type of anti loosening gasket. This type of nut is not a hexagonal nut, but a round nut with 3, 4, 6, or 8 notches on the circumference of the nut, used for tightening tool force and locking the locking washer into place.

Nut with countersunk head screw: There are usually two threaded holes drilled through the outer surface to the inner threaded surface of the nut, distributed at a 90 ° angle on the outer surface, used to screw in small diameter countersunk head screws and apply a centripetal force to the threads to prevent the locking nut from loosening. A high-quality nut is embedded with a copper small piece on the inner surface that matches the thread of the locking nut, to prevent the radial tightening screw from directly contacting the locked thread and damaging it.

Wedge type anti loosening nut: It consists of two parts, each with staggered cams. Due to the internal wedge design slope angle being greater than the nut angle of the bolt, this combination tightly fits into a whole. When vibration occurs, the protruding parts of the anti loosening nut move against each other, generating lifting tension and achieving the anti loosening effect.

Structural anti loosening nut: By improving the design on the threaded structure, it obtains its own locking function without relying on other external factors, with wide applicability and low environmental requirements.

national standard

The relevant standards include "Mechanical Properties of Fasteners - Effective Torque Steel Lock Nut" (GB/T3098.9-2020), "Type 2 All Metal Hexagonal Lock Nut" (GB/T6185.1-2016), etc., which specify the mechanical properties, dimensional specifications, test methods, etc. of lock nuts to ensure that their quality and performance meet the requirements.

Application field

Widely used in fields such as mechanical manufacturing, automobiles, aerospace, railways, bridges, etc., it is used to ensure the stability of connections in automotive engines, chassis, and suspension systems, and to accurately fix key components such as bearings in machine tool spindles.