Class 5 Weld Square Nuts

Class 5 Weld Square Nuts are specific fasteners. They’re meant for permanently attaching to sheet metal or structural parts by welding. They have a flat, square base with four small projections—usually little nubs or a continuous flange around the edge. These nuts provide a strong threaded anchor point that can bear loads.

The square shape gives good stability and stops them from rotating when you’re putting things together. That makes them work well for automated processes and uses where you need high pull-out strength. They’re pretty important in industries like automotive, appliance making, and construction—places where you need reliable, fixed fastening points in thin materials.

Product Details

The main job of Class 5 Weld Square Nuts is to create a strong, internally threaded connection point on surfaces where putting a regular nut just doesn't work. Their design makes it easy to do projection welding (a type of resistance welding) quickly and securely right onto the workpiece surface.

Once they’re welded on, they become part of the assembly. The backside is either flush or almost flush with the surface. This built-in thread lets you fasten and unfasten bolts or screws over and over, and it won’t mess up the welded joint on the main material.

Excellent anti-corrosion performance

Our Class 5 Weld Square Nuts are usually made from low/medium carbon steel (like Grade 4, 5, or 8 equivalents), stainless steel (AISI 304 or 316), and sometimes brass. The carbon steel ones are often zinc plated—either electroplated or mechanically plated—to keep them from rusting. The stainless steel ones naturally resist corrosion. What material you pick directly affects how well they weld and how strong they end up being.