Product Description:

Hexagonal Nylon Insert Lock Nut, also known as prevailing‑torque lock nut, consists of a hex‑shaped nut body and built‑in nylon insert. The zinc‑plated surface delivers rust‑proof and wear‑resistant performance. The nylon ring clamps threads to create damping friction for reliable self‑locking and vibration‑resistant capacity. It is a widely‑used anti‑loosening fastener matched with standard external‑thread bolts.

Key Features:

1. Built‑in nylon locking insert: The nylon insert grips bolt threads to build steady damping torque. It stays locked under strong vibration, no extra spring washer needed.
2. Zinc‑plated anti‑corrosion finish: Blue‑white zinc plating resists oxidation and rust, with smooth bright outer surface.
3. Accurate standard internal thread: Manufactured to DIN985 & ISO7040 specs. Smooth thread fit retains locking torque after repeated disassembly.
4. Standard hex‑shaped body: Compatible with spanners and socket tools for quick installation.
5. Thread‑friendly locking design: The nylon ring causes no damage to bolt threads, ideal for vibrating machinery parts.

Common Applications:

Commonly used for auto spare parts, construction machinery, rail transit components, new‑energy equipment, home‑appliance hardware, sheet‑metal cabinets, automation machines, motorbike fittings, solar brackets, production‑line fixtures and farm machinery where vibration‑proof fastening is required.

When to Use Lock Nuts?
For Vibrating or Moving Machinery
If you’ve ever been near a press or conveyor belt, you know that vibration can be devastating to unsecured fasteners. In these environments, even with washers, standard nuts will loosen over time. Lock nuts provide a secure hold because their locking properties resist the “displacement” caused by vibration.

We have several railway maintenance clients who replaced standard nuts on mounting brackets with nylon inserts compliant with the DIN 985 standard. By eliminating the need for frequent retightening, they’ve cut their downtime in half.

In Safety-Critical or Load-Bearing Applications
Think of scaffolding joints, elevator guide rails, or bridge maintenance panels. In these situations, the cost of fastener failure goes beyond repair expenses—it poses a safety hazard. Lock nuts provide an extra layer of safety by preventing accidental loosening.

One of our marine clients uses stainless steel serrated flange nuts on deck fittings. Sea spray, wave impact, and constant motion—these lock nuts withstand it all without loosening.

In environments subject to thermal expansion or contraction
Metals expand and contract with temperature changes. If you install outdoor solar panels in a desert climate, you may experience temperature fluctuations of up to 30°C in a single day. Standard nuts lose their preload as the metal “breathes.” Lock nuts, however, maintain a more stable preload throughout these temperature fluctuations.

FAQ:

Q: Do lock nuts require washers?
A: Answer: Not necessarily. Serrated flange lock nuts come with built-in washers. For lock nuts with nylon inserts, using flat washers can help distribute pressure and protect softer surfaces.

Best Competitive Advantages:

1.OEM Accepted

2.We hold multiple international certifications including ISO, CE, SGS, and comply with various industrial standards such as DIN (German Standard), BS (British Standard), and GB (Chinese National Standard).

3.Strict quality control

4.The shortest delivery

5.Best service

6.Vary competitive price

7.Customer’s design and logo are welcome