M2-M30 Standard Metric Wire Thread Insert 304 Stainless Steel Repair

M2-M30 Standard 304 Stainless Steel Repair Metric Wire Threaded Insert

Structure

The wire thread insert is made of high-hardness, corrosion-resistant steel wire with a diamond-shaped cross-section. It is a spring-like concentric body of internal and external threads. The standard internal thread used for fastening parts has a cross-sectional shape that is a combination of two internal and external threads. Wire thread inserts are divided into two types: ordinary type and locking type, each with or without breaking grooves and with breaking grooves.

The locking type is a polygonal locking ring with one or more turns added to the ordinary threaded sleeve. The elasticity of the locking ring has a braking effect on the screw. The locking wire thread insert has all the advantages of the ordinary wire thread insert, does not affect the installation of the screw, and only adds an appropriate torque during installation.

Features

(1) The diameter of the wire thread insert in the free state is slightly larger than the diameter of the screw hole into which it is inserted. When assembling, the wire thread insert is subjected to the torque of a special wrench to make its diameter smaller and enter the threaded hole that has been tapped with a special tap. After being installed, the steel wire threaded sleeve produces a spring expansion effect, making it firmly fixed in the threaded hole, and will never come out with the screw out.

(2) Increase the load-bearing capacity and fatigue strength of the threaded connection: the wire threaded sleeve makes the screw and the internal threaded hole for the installation of the wire threaded sleeve form an elastic connection, thus eliminating the screw moment and tooth form half-angle error between the internal and external threads. The load on each thread is evenly distributed at the specified length, thereby strengthening the internal thread and damping vibration, so the fatigue strength of the threaded connection of the parts can be improved.

Specification notation

1. According to the marking method of domestic production wire thread inserts:

(1) ST (common type) STd (diameter) p (pitch)-nd

(2) ZST (locked type) ZSTd (diameter) p (pitch) -nd

(3) ZGST (high temperature locking type) ZGSTd (diameter) p (pitch) -nd

2. According to the marking method for wire thread inserts produced abroad:

(1) FR (common type) MD (diameter) × P (pitch)-nD (diameter)

(2) SL (locking type) MD (diameter)×P (pitch)-nD (diameter)

Standard notation

D (diameter) × P (pitch) × N or W (number of turns of wire threaded thread in the free state)

Note: Each domestic standard for wire thread inserts has specific regulations on the marking method of wire thread inserts, see each standard for details

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