Helefastener CLS self-clinching nuts create strong, permanent, reusable female threads in thin sheet metal where tapping is not practical. The nut is pressed into a round punched or drilled hole; the knurled or hex body displaces sheet material into an undercut groove and locks flush without welding, riveting or secondary finishing. CLS series nuts are made for sheets up to HRB 50 (Rockwell B) / HB 82 (Brinell) hardness – typically mild steel and aluminium panels – and are part of the same installation logic as PEM CLS equivalents, so existing tooling and hole preparation carry over.
Specifications
| Parameter | Value |
|---|---|
| Thread range | M2–M10 metric; unified inch threads available |
| Sheet hardness limit | Up to HRB 50 / HB 82 (steel or aluminium sheet) |
| Materials | Steel (zinc plated), 300 / 400 series stainless steel, aluminium, brass |
| Installation | Press into round punched or drilled hole; flush finish, no welding |
| Standards | Manufactured to GB, ISO, ASTM, DIN and SAE equivalents |
How to specify
To size a CLS nut correctly you need three inputs: the thread you must carry, the panel thickness, and the sheet hardness. Sheet softer than the hardness limit clinches reliably; harder sheet risks compromising the clinch. Hole size tolerance matters as much as thread size – an oversize hole is the most common cause of a nut that turns under torque after installation.
Related types in this family
- Type S – standard self-clinching nut for harder sheet
- Type CLA – for aluminium sheet at the soft end of the range
- Type SP – miniature pitch for compact electronics panels
- Type F – flush-nut variant when the sheet face must stay flat
- Type PL – nylon-locking variant for vibration-prone assemblies
Not sure which type fits your sheet? Send us your panel thickness, hardness and thread via the quote form or WhatsApp – our engineers will confirm type and part number, and free samples ship freight collect via DHL, FedEx, UPS or TNT.