PEM® brand WNS™ self-locating projection weld nuts are stainless steel fasteners designed to be welded onto thin metal sheets, providing threaded insertions without the need for tap threads. The WNS-440-0 variant features a #4-40 thread, a shank diameter of 0.173 inches, and a minimum hole size of 0.030 inches. Its round head and engineered projections prevent burn-through, eliminate indexing, and protect threads from spatter. The nut is compatible with standard 50KVA spot-welding equipment using flat-faced electrodes with tip diameters 0.125 inches larger than the E dimension. It offers corrosion resistance and is suitable for sheet thicknesses up to 0.063 inches. All weld nuts in the series meet ASME B1.1 and B1.13M thread standards with a 2B/6H tolerance and are passivated with copper flash to prevent surface rust and facilitate automatic feeding. The minimum distance from the hole center to the sheet edge is 0.154 inches.
PEM® weld nuts (Types WN/WNS) provide load-bearing threads in metal sheets too thin to tap, and permit faster assembly.
PEM brand weld nuts overcome many problems associated with other weld nuts – burn-outs, complicated electrodes and pilots, tedious time-consuming indexing and re-tapping to remove weld spatter. Their design, based on the experience of hundreds of users of weld nuts, speeds production using standard equipment, thereby reducing labor costs.
PEM stainless steel weld nuts offer the added advantage of resisting corrosion. You may specify steel or stainless steel for your requirements and be sure you are getting the weld nuts that are easiest to install. A variety of welding equipment is suitable for installation of PEM weld nuts. Best results have been obtained with a 50KVA press-type, spot-welding machine whose upper welding head moves vertically in a straight line with the lower electrode. Flat-faced electrodes with tip diameters .125” / 3.2 mm larger than the “E” dimension of the PEM weld nut should be used.
| PennEngineering® | bisco industries | |
|---|---|---|
| Product Category | Nuts | Nuts |
| Product Number | WNS-440-0 | WNS-440-0 |
| Product Name | Self-Locating Projection Weld Nuts - Unified | Weld Nuts |
| Type | Weld Nut |
