NC CLINCH Locknut
Note: Other finishes available upon request.
MATERIAL:
STEEL.
ALUMINUM ALLOY—2017-T4 or Equiv.
STAINLESS STEEL—18-8.
BRASS—Commercial Half Hard.
FINISH:
As required.
LOCKING INSERT:
Black Nylon (250°F max performance).
APPLICATION:
Clinch Nuts are permanently self-retained, self-locking fasteners for installation in aluminum or soft sheet steel assemblies. They provide load-bearing threads in thin sheet metal and offer a highly reliable method of blind fastening. Only four simple steps, outlined on this page, are required to insure trouble free production and superior product performance.
STEP 1 SELECT THE PROPER NUT, MOUNTING HOLE DIAMETER, TOOLS AND FLARING PRESSURE.
STEP 2 PREPARE THE HOLE CORRECTLY.
Installation holes may be drilled or punched by normal production methods but must be held to the tolerances indicated in table above. Care should be taken to have the hole clean, perfectly round (not oval) and at 90' to the surface of the work. It is recommended that the holes be punched rather than drilled for greater accuracy.
STEP 3 INSERT NUT SHANK COMPLETELY INTO THE HOLE.
When inserting the nut in the hole it is important that the nut base be fully and squarely seated against the work face. According to the clinch nut size, select the correct dolly from table above. Place the dolly on the crown of the nut, forcing the nut into the seated position. Use a light hammer blow or small power press on the dolly to seat the nut — do not strike or press directly on the crown of the nut.
STEP 4 CLINCH OR SWAGE THE NUT SHANK.
This final step securely locks the nut in the hole against twist-out and push-out forces and makes the nut an integral part of the assembly. Place the dolly against the head of the nut with the punch centered on the extended shank of the nut. The dolly acts as a support for the nut body as the pressure exerted by the punch forces the edges of the shank outward. Best results are obtained by exerting steady controlled pressure to the limits outlined in table above.
FOR COUNTERBORED INSTALLATIONS.
In assemblies requiring flush mounting surfaces or where material thickness is greater than the .163 maximum standard clinch nut grip, the rolled-over clinch shank may be recessed into a counterbored hole. The above table gives the minimum counterbore diameters allowing access of the punch tool to properly roll over the shank.
