ALNd — UNC A2 (Double-Slotted All-Metal Lock Nuts)
Stainless steel A2-70, UNC thread, prevailing-torque lock nuts per ISO 2320. Engineered for repeatable assembly, secure re-use, and corrosion resistance.
- Material grade: Stainless Steel A2-70 (AISI 304), per ISO 3506-2.
- Finish: Electro Polishing + Wax Coat (typical for A2). Clear Zinc available on request for steel variants.
- Performance: Prevailing torque compliant with ISO 2320.
- Compliance: RoHS conformant.
- Use cases: Chemical, marine, food, and outdoor environments where corrosion resistance matters.
- All-metal design — unaffected by most chemicals and temperature swings.
- Double-slot prevailing-torque feature for low installation torque and reliable re-use.
- UNC thread family: from #4-40 up to 3-4.
- For safety-critical joints, verify tightening torque per your engineering spec (bolt size, lube, property class).
| Part Number | d | Pitch (TPI) | S / inch | h / inch | m / inch |
|---|---|---|---|---|---|
| ALNd0440A2 | n 4 | 40 | 0,188 | 0,175 | 0,087 |
| ALNd0632A2 | n 6 | 32 | 0,250 | 0,215 | 0,107 |
| ALNd0832A2 | n 8 | 32 | 0,312 | 0,275 | 0,137 |
| ALNd420A2 | 1/4 | 20 | 0,437 | 0,340 | 0,182 |
| ALNd518A2 | 5/16 | 18 | 0,500 | 0,410 | 0,232 |
| ALNd616A2 | 3/8 | 16 | 0,562 | 0,490 | 0,292 |
| ALNd714A2 | 7/16 | 14 | 0,687 | 0,570 | 0,357 |
| ALNd813A2 | 1/2 | 13 | 0,750 | 0,660 | 0,420 |
| ALNd912A2 | 9/16 | 12 | 0,872 | 0,725 | 0,483 |
| ALNd1011A2 | 5/8 | 11 | 0,937 | 0,810 | 0,545 |
| ALNd1210A2 | 3/4 | 10 | 1,125 | 0,975 | 0,670 |
| ALNd1409A2 | 7/8 | 9 | 1,312 | 1,051 | 0,703 |
| ALNd1608A2 | 1 | 8 | 1,500 | 1,185 | 0,792 |
| ALNd1807A2 | 1 1/8 | 7 | 1,687 | 1,358 | 0,870 |
| ALNd2007A2 | 1 1/4 | 7 | 1,875 | 1,498 | 0,960 |
| ALNd2206A2 | 1 3/8 | 6 | 2,062 | 1,646 | 1,055 |
| ALNd2406A2 | 1 1/2 | 6 | 2,250 | 1,799 | 1,150 |
| ALNd2805A2 | 1 3/4 | 5 | 2,625 | 2,101 | 1,365 |
| ALNd32045A2 | 2 | 4 1/2 | 3,000 | 2,226 | 1,425 |
| ALNd36045A2 | 2 1/4 | 4 1/2 | 3,375 | 2,340 | 1,510 |
| ALNd4006A2 | 2 1/2 | 4 | 3,750 | 2,550 | 1,685 |
| ALNd4406A2 | 2 3/4 | 4 | 4,125 | 2,845 | 1,930 |
| ALNd4804A2 | 3 | 4 | 4,500 | 3,062 | 2,150 |
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Available on request: alternative finishes, specials, and additional sizes.
Dimensions and availability may vary. For critical applications, confirm specification, torque, and material with engineering.