2D and 3D CAD models available for our entire inventory of fasteners!

Self-Clinching Steel Heavy Duty Nuts - Series CFH, CFHN

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Captive Fastener Brand of self-clinching heavy duty nuts provide superior push out and torque out values in thin panels. The larger profile enables the design engineer to be able to use the CFH, CFHN, and CFHNL nuts in thin sheets with strong reusable threads at a very low installed cost. The heavy duty nuts are superior to tapping a thread in an extruded hole in the metal panels which do not provide the strength nor the reusability that the self clinching heavy duty nuts offer. The design of the self clinching heavy duty nuts, provide a simple means installation whereby the clinch nut is placed into a pre-punched hole in the panel and when the squeezing force is applied the clinch nut becomes an integral part of the chassis. The basic premise for the proper installation of the clinch nuts is that the fasteners must be harder than the panel into which they will be installed. The clinch fasteners also need to be installed into ductile materials such as steel, aluminum, or copper panels. The maximum recommended hardness for the CFH series of heavy duty clinch nuts is HRB 80 and the maximum panel hardness for CFHN and CFHNL series is HRB 60. The CFHNL series of heavy duty nuts offer a locking thread, which is often desired in a design that may be subject to vibration, which may cause the mating screw to disengage from the nut. The locking feature can prevent the mating screw from backing out and possibly shorting out the electronic unit.

CFH_CFHN 2D
 

Heavy Duty Clinch Nut Installation

The way that heavy duty clinch nuts work is that when the fastener is placed into the proper size hole in the panel, the ductile material flows around the clinch profile and performs a permanent bond in the assembly. Due to the fact the clinch nuts are harder than the panels into which they will be installed they retain their dimensional integrity and physical properties. When installed the heavy duty clinch nuts have excellent torque out and push out resistance that meet or exceed industry standards. The proper hole sizes and minimum panel thickness is available in our catalog under the Dimensions & Specifications section.  The required installation force and push out and torque values are available in the Installation & Performance section or our Catalog.  The heavy duty clinch nuts offer a green solution that is cleaner than weld nuts and eliminates weld spatter and the subsequent need to chase the threads after the welding process. The Heavy Duty clinch nuts are both REACH and RoHS compliant. If 2D and 3D prints are needed they can be downloaded from our website on product pages.