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What is A Self Clinching Nut?

What is a Self Clinching nut? Rivmate self clinching nuts

A self clinching nut is a nut fastener applied to sheet or sheet metal. It has a round shape with embossed teeth and a guide groove at one end. The principle of self clinching nut is through the embossed teeth pressed into the sheet metal pre-set holes, generally speaking, the diameter of the pre-set holes is slightly smaller than the self clinching nut’s embossed teeth, through the pressure to make the self clinching nut’s flower teeth squeezed into the plate, resulting in the periphery of the hole undergoes plastic deformation, deformation of the material is squeezed into the guiding groove, and ultimately the nut and the base material locking connection.

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Advantages of Self Clinching Nuts

Self clinching nuts through the pressure rivet nut and thin plate riveted in this way, widely used in chassis cabinets, sheet metal, and other stamping parts.Its industry throughout the communications, automotive, network equipment and so on. Self clinching nut can be installed in all kinds of aluminium alloy profiles and plates. But the strength of the connection is greatly affected by the strength of the parent material. And the installation of self clinching nuts in the inner cavity of the profile need to open the process hole to ensure that riveting moulds can be contacted with the nut.

Advantages of Self Clinching Nut:

  • The back of the board remains completely flat
  • Good fastening effect. The objects connected by the use of self clinching nuts are tight and not easy to loosen the situation
  • Easy to install. Self clinching nuts can be fixed quickly with special tools, fast and easy to install.
  • Wide range of applications. Self clinching nuts can be used to connect objects of different thicknesses or materials and are suitable for use in a wide range of mechanical equipment and automotive manufacturing.
  • High vibration resistance. Due to its fastening effect, the self clinching nut can be used in high-frequency vibration and shock environments.
self clinching nuts

How to Self Clinching Nuts Work ?

Self clinching nut by extrusion, the embossed teeth will be pressed into the pre-set holes in the sheet metal. The periphery of the hole produces plastic deformation. The deformed material is squeezed into the guide groove, thus producing the effect of locking.

self clinching nuts

How to Install Self Clinching Nuts?

Self clinching nut is a common structural component. Which is widely used in mechanical equipment, machine manufacturing, engineering construction and other industries. Self clinching nut can fix two parts together to meet the installation requirements of the equipment.

Steps for installing self clinching nuts:

  1. Firstly check that the self clinching nut is of the required size. The size of the self clinching nut should not be too large, otherwise it will not be able to be effectively attached to the machine components.
  2. Ensure that the internal area of the self clinching nut is larger than the external area for an effective seal.
  3. Before installing the self clinching nut, place the self clinching nut into the hole and make sure the self clinch nut is fully inserted into the hole.
  4. The riveting process is carried out using specialised riveting machines.
  5. After completing the installation of the self clinch nut, check the degree of installation of the self clinch nut and observe if it is installed flat.
clinch nut installation

What is The Difference Between A Weld Nut And A Clinch Nut ?

Weld Nut: Welding a nut requires several pre-machined bumps and another workpiece surface to be contacted. Electrically heated and then collapsed to connect the nut to the workpiece. It is a method of joining by forming a welded joint at the point of contact with the workpiece.

Self Clinching Nut: Self clinching nuts can be divided into Carbon steel S self clinch nut, stainless steel CLS self clinch nut, hardened stainlee steel SP self clinch nut and copper,aluminum CLA self clinch nut in terms of material.

How do you choose between a weld nut or a self clinch nut?

  • Weld nuts are hot connections and self clinch nuts are cold connections.
  • Self clinch nut is the deformation of the plate, weld nut is the nut and plate together deformation to achieve the connection.
  • Weld nuts are the strongest on the same material, self clinching nuts must be used on thin plates, you can’t use self clinch nuts on finished products.

These two have their own advantages and disadvantages. Such as welded nuts, the strength is relatively large, and the use of a wide range of thin and thick can be. But due to high temperature will lead to deformation of the connected parts. And not removable, and some active metals can not be welded with the usual methods. Such as aluminium, magnesium, etc., need to protect the gas or argon arc welding, the requirements of the processing technology and precision. And self clinching nut installation is simple, can be disassembled, easy to install and transport and so on. It is suitable for almost any metal that can be punched, but the scope of use is narrow, and can only be used for thin-walled plate or sheet metal connection.

Materials and Specifications of Self Clinching Nut

Self clinching nuts are classified into S type, CLS type, SP type and CLA type in terms of material, which are used in different applications. The sizes are usually from M2 to M12.

S, CLS, SP, CLA are all types of self clinching nuts, these types of description specification from the early PEM’s internal standards, has now become the industry standard for riveting industry, and PEM in the industry equivalent to IBM’s early position in the micro-computer industry.

To date, the industry standard definition is:

S: on behalf of the material for carbon steel self clinch nuts

CLS: represents the material for the stainless steel self clinch nut

SP: represents the material for the stainless steel self clinching nuts

CLA: represents the material of aluminium self clinching nut.

S,CLS,SP,CLA are all self clinch nuts, they are just different materials. S,CLS are used in more applications in the market, SP is relatively less, and CLA is very rare.

Points to note for different materials of self clinching nuts.

Regarding the specific grades of these three materials. The S class carbon steel is made of 10B21, the CLS class stainless steel is made of SUS304, while the SP class stainless steel is made of SUS400 series such as (SUS416), the SUS400 series martensitic stainless steel (commonly known as stainless steel) has a certain degree of corrosion resistance, and the hardness can reach a maximum of HRC42~55 after vacuum quenching. Apply to stainless steel plate and harder thin plate or torsion requirements of the higher working environment.

Note, stainless steel self clinch nut corresponding to the sheet material is 304 stainless steel plate. That is: 304 plate can not be used CLS self clinch nut (CLS refers to 304 or 303 material self clinch nut), but should be used SP type self clinching nut (i.e. stainless steel material self clinching nut).

If you force the use of CLS type stainless steel self clinch nut pressed into the 304 series of stainless steel sheet, will be able to serious consequences, namely: the nut is easy to fall off.

Wholesale High Strength Self Clinching Nuts from China

SP class of stainless steel self clinch nut with high hardness characteristics, rust resistance is lower than the SUS304 CLS-type nut. In addition, it has a distinctive property: SP nut is magnetic, it can be easily sucked up by ordinary magnets, this point and SUS304’s weak magnetism has a very obvious difference.

If you are new to this type of self clinch fastener. And the technical department hands you a piece of 304 or 316 or 201 stainless steel plate with a stainless steel nut riveted on it.Then you have to be careful, this self clinch nut is most likely not of the CLS type (SUS304) but of the SP type (SUS416).

In principle, the hardness of the nut should be higher than the plate. 304 thin plate is recommended to use stainless steel material SP self clinch nut .(S-type carbon steel rivet nut can also be pressed but the rust resistance of the view and the appearance does not match the Therefore, it is not recommended).

Types Material Cold Rolled Galvanised Sheet Stainless steel Sheet Copper Sheet Aluminium Sheet
S 10B21
CLS SUS304 - ×
SP SUS410

Applications of Self Clinching Nuts

Self clinching nut is usually used for 0.8MM ~ 3.2MM plate.

The following are not suitable for the use of self clinching nuts in several cases
1. the plate is very thin, such as only 0.5MM; or very thick, such as 4MM or more.
2. two plates together.
3. the installation space does not allow the use of pressure riveting machine, for example, the board is curved or the shape of the board is very complex bad positioning, etc. …… Note that this is the key point: when the plate can not be riveted in the place of the removal of the bend, it is recommended to use the self clinch nut.

Self Clinch Nuts are especially useful in stressful situations due to their very strong tightness. Self clinching nuts are commonly used to secure plates to metal brackets and can also be used in automobiles, aeroplanes, toys and electronic devices. Specifically, they can be used in the following areas:

  1. Electrical assemblies: DC motors, AC motors, engine components, generators, dual mass radiation steam heads, fans, gears, parallel grinding heads, cranes, mixers, etc.
  2. Electronic equipment, power components, pressure concentrators, CCTV and ore sorting machines with high reliability requirements.
  3. Bolted connections in aerospace, ship and weapon industries.
  4. Oil pipeline engineering, bridge construction.

applications of self clinching fastener
applications of self clinching fastener

Get High Quality Self Clinching Nuts From Top Self Clinching Manufacturer in China

Rivmate is top self clinching nuts manufacturer in china. Rivmate has been specialising in fasteners for over a decade. We can fulfil high volume fastener orders.If you are in need of high quality self clinching nuts, you can choose rivmate to be your long-term supplier!

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