Self-clinching fastener: the easiest way to solve mounting problems

Before 1942, mounting problems required massive time, heavy labor, and large inventory. But things have changed after the revolutionized and innovative fastener came out. In a broad sense, a self-clinching fastener refers to any device which displaces the main material around the mounting hole when pressed into the ductile metal. Then it will flow into a specially designed circular groove in the shank or pilot of the fastener.

fastener

This easy-to-install, self-clinching fastener has shown its benefits to most facilities:

• Provide solid threads in metal as thin as .012″0.3 mm.

• Install into a plain, round hole.

• Installed via any parallel acting squeezing force.

• Require no special hole preparation, like chamfering and deburring.

• Offer excellent pushout and torque-out resistance.

• The reverse side of the plate remains flush.

• Require no retapping after application.

• Low installed costs.

All the advantages have ushered in a new era for engineers and designers, making a great many thin-metal designs possible for the first time.

Industry-wide recognition has led to the massive production of self-clinching fasteners soon after World War II. With the growing demand for ultra-thin and ultra-light metals, the self-clinching fastener design has developed for a variety of new design applications. Nowadays, spacers, standoffs, nuts, studs, and other components are widely used by an array of manufacturers, including producers of telecommunication, computer hardware, medical, aerospace equipment, and systems.

fastener

Why should we use self-clinching fasteners?

Self-clinching fasteners are designed for manufacture and assembly; they help designers meet DFMA parameters, including:

• Fewer parts to handle

• Fewer assembly steps

• Less total assembly time

All of them reduce time to market, improve quality through simplification, and reduce overhead.

Yet self-clinching fasteners have its usage requirements:

• Appropriate sheet thickness

• Pre-punching

• Access to both sides of the plate for installation

• Insert press with adequate throat depth to reach the installation point

All these conditions met, self-clinching fasteners are the best solution for robust, clean, permanent threads in thin sheet metal.

How to choose a reliable self-clinching fastener?

The reliability of a self-clinching fastener in service mainly depends on five factors, including a hole with the proper size, the thickness of the sheet, hardness of the host panel, correct installation, and fastener quality. There are three tests to determine the reliability of self-clinching fastener in service. There are three tests for self-locking fasteners to assess their reliability in use.

• First, the torque-out test. This test is often conducted at the head of the fastener with values exceeding the ultimate torsional strength of mating screw or nut.

• Second, check the pushout. Pushout values represent the axial resistance of a fastener to remove it from the sheet opposite to the installation direction and should be roughly 5 to 10% of the force used to establish the fastener.

• Lastly, check the pull-through. Pull through the metal sheet when a clamping torque is applied.

fastener

If you ask me to recommend a self-clinching fastener that can bear all the tests above, I would probably put the brand SOZN fasteners on the recommendation list. Shenzhen SOZN ironware Products Co. Ltd. is one of the largest enterprises in the same field. They focused on the production of precision hardware machining like screws, nuts, etc. for decades. Their professional devices provide worldwide customers with long-term increased value and service. Except for their fasteners with high quality, the company has excellent quality control, fast delivery, integrity, and responsibility.

Conclusion

Of course, the decision to buy professional fasteners depends on what feature you value the most. But still, we hope that after reading this post you got a general idea of what you should look for to choose suitable products.

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