I. Installation Direction and Procedure Compliance
1. Nylon Ring Orientation: The nylon end must face outwards (exposed to air). If it faces inwards, the anti-loosening mechanism will fail.
2. Thread Direction: Right-hand threads tighten clockwise, left-hand threads tighten counter-clockwise. This can be determined by observing the thread direction: place the screw vertically; the direction in which the threads climb upwards is the tightening direction.
II. Anti-Loosening Performance Test
1. Double Nut Method: After tightening the main nut, tighten the secondary nut as well. Suitable for low-speed, heavy-load applications.
2. Dedicated Anti-Loosening Nut: Requires an anti-loosening washer; the notch is the point of application. Suitable for vibration or impact applications.
3. Nylon Lock Nut: The nylon ring generates friction to prevent relative rotation, but long-term vibration may cause a decrease in preload.
III. Reuse Status Inspection
1. Thread Wear: Check for stripped or deformed threads. Replace if severely worn. 2. Nylon Ring Condition: Whether the nylon ring is aged or cracked affects its anti-loosening effect.
IV. Recommended Tools and Methods
1. Torque Wrench: Used to control torque and ensure the preload meets the standard.
2. Torque Method: Controls the preload by measuring bolt elongation; suitable for high-precision applications.
V. Precautions
1. Lubrication: Apply lead powder or molybdenum disulfide lubricant to the threaded parts to prevent seizing.
2. Step-by-Step Tightening: Grouped bolts should be tightened symmetrically in three stages to prevent deformation of parts.
3. Tool Compatibility: Use a hook wrench for round nuts; never use a flathead wrench.
