Auto-Lok Self-Locking Nuts — ALNssn (Metal Ring Insert)
Self-locking nuts with a metallic ring insert. Advisory: this insert can cut into the bolt material, risking thread damage and compromising reusability. Consider all-metal prevailing-torque alternatives for repeatable assembly.
- Design: metallic ring insert provides a one-time prevailing torque effect.
- Caution: insert may score bolt threads; reuse is not recommended.
- Materials available: Class 5 steel, Class 6 steel, and stainless steel A2.
- Use cases: non-critical, single-use joints where thread marking is acceptable.
Need reusable, lower-damage locking? See our all-metal options (e.g., ALNtpd, ALNd) or contact us for guidance.
Metric — Class 5 Steel
| Part number | Thread (d) | Pitch (mm) | Part number | Thread (d) | Pitch (mm) |
|---|---|---|---|---|---|
| ALNssnM3x050CL5 | M3 | 0.50 | ALNssnM4x070CL5 | M4 | 0.70 |
| ALNssnM5x080CL5 | M5 | 0.80 | ALNssnM6x100CL5 | M6 | 1.00 |
| ALNssnM8x125CL5 | M8 | 1.25 | ALNssnM10x150CL5 | M10 | 1.50 |
| ALNssnM12x175CL5 | M12 | 1.75 | ALNssnM14x200CL5 | M14 | 2.00 |
| ALNssnM16x200CL5 | M16 | 2.00 | ALNssnM18x250CL5 | M18 | 2.50 |
| ALNssnM20x250CL5 | M20 | 2.50 | — | — | — |
Metric — Class 6 Steel
| Part number | Thread (d) | Pitch (mm) | Part number | Thread (d) | Pitch (mm) |
|---|---|---|---|---|---|
| ALNssnM3x050CL6 | M3 | 0.50 | ALNssnM4x070CL6 | M4 | 0.70 |
| ALNssnM5x080CL6 | M5 | 0.80 | ALNssnM6x100CL6 | M6 | 1.00 |
| ALNssnM8x125CL6 | M8 | 1.25 | ALNssnM10x150CL6 | M10 | 1.50 |
| ALNssnM12x175CL6 | M12 | 1.75 | ALNssnM14x200CL6 | M14 | 2.00 |
| ALNssnM16x200CL6 | M16 | 2.00 | ALNssnM18x250CL6 | M18 | 2.50 |
| ALNssnM20x250CL6 | M20 | 2.50 | — | — | — |
Metric — Stainless Steel A2
| Part number | Thread (d) | Pitch (mm) | Part number | Thread (d) | Pitch (mm) |
|---|---|---|---|---|---|
| ALNssnM3x050A2 | M3 | 0.50 | ALNssnM4x070A2 | M4 | 0.70 |
| ALNssnM5x080A2 | M5 | 0.80 | ALNssnM6x100A2 | M6 | 1.00 |
| ALNssnM8x125A2 | M8 | 1.25 | ALNssnM10x150A2 | M10 | 1.50 |
| ALNssnM12x175A2 | M12 | 1.75 | ALNssnM14x200A2 | M14 | 2.00 |
| ALNssnM16x200A2 | M16 | 2.00 | ALNssnM18x250A2 | M18 | 2.50 |
| ALNssnM20x250A2 | M20 | 2.50 | — | — | — |
Tip: For critical or repeat-assembly joints, use an all-metal self-locking nut to avoid thread scoring and maintain consistent prevailing torque.
Questions about suitability? Talk to our engineers.