Countersinking Guidelines
Important:
Countersinking is a vital process in sheet metal fabrication, particularly when creating components that require a smooth surface with no protruding screw heads or fasteners. This technique involves enlarging the top portion of a pre-drilled hole, creating a tapered seat that allows flat-head screws or bolts to sit flush with or beneath the surface of the sheet metal.
| Name | Units | Hole Size | Outer Diameter |
|---|---|---|---|
| #4x82º CS | in | 0.129" | 0.255" |
| #6x82º CS | in | 0.150" | 0.307" |
| #8x82º CS | in | 0.177" | 0.359" |
| #10x82º CS | in | 0.201" | 0.411" |
| 1/4x82º CS | in | 0.266" | 0.531" |
| M2x90º CS | mm | 0.095" | 0.173" |
| M3x90º CS | mm | 0.134" | 0.265" |
| M4x90º CS | mm | 0.177" | 0.353" |
| M5x90º CS | mm | 0.217" | 0.441" |
| M6x90º CS | mm | 0.260" | 0.529" |
Hardware
Hardware insertion is the process of installing PEM nuts, studs, standoffs, and other fasteners into sheet metal parts. These components are essential for the assembly of sheet metal parts and are often used to attach other components like PCBs, panels, and other sheet metal parts.
Tapping
Tapping is a method of creating internal threads in pre-cut holes of a sheet metal piece, allowing for secure attachment of threaded components like screws or bolts.