Self-locking nuts that stay tight under vibration, heat & liquids
Auto-Lok all-metal lock nuts deliver secure, reusable fastening with lower prevailing torque than conventional designs — trusted in rail, automotive, energy and machinery.
CAGE Code B7347 • Certificates of Quality & Conformity available
Featured products
ALNd Double Slotted — Standard
Lower prevailing torque; highly reusable across multiple cycles.
ALNsbMJ Threaded
Metric MJ threads; stainless A286 options.
ALNsh Single Slotted — H=1.3D
Single-slotted all-metal locking design with higher nut height (H=1.3D).
ALNsM Single Slotted — H=1D
Single-slotted all-metal locking design in standard height (H=1D).
ALNvsr Vertical Slotted Ring
All-metal insert; vertical slots; lower installation torque.
Why choose Auto-Lok
- All-metal, reusable locking — no nylon inserts.
- Lower prevailing torque vs conventional nuts for easier installation.
- Excellent vibration resistance; locking performance unaffected by oil, petrol or vapors.
- Meets common norms (ISO 2320, ISO 898-2; NFE 27-024 for slotted rings).
- Technical support & fast quoting.
Easier assembly with consistent prevailing torque over multiple cycles.
Stable performance in heat, cold and aggressive environments.
Tested to relevant norms and rail approvals.
Responsive help for OEM and service projects worldwide.
Applications
Auto-Lok lock nuts — FAQs
What is “prevailing torque”?
Prevailing torque is the torque required to run a lock nut down a male thread due to an intentional interference in the nut. Auto-Lok designs achieve this with slotted geometry or inserts that apply spring pressure on the thread.
Are Auto-Lok nuts reusable?
Yes. When used within specification, Auto-Lok all-metal nuts maintain removal torque over multiple cycles, unlike nylon-insert nuts which degrade under heat and chemicals.
What standards do they meet?
Typical references include ISO 2320 (prevailing-torque test), ISO 898-2 (proof load) and NFE 27-024 for slotted ring performance. Check each product datasheet for exact compliance.