What Are The Requirements for The Thread Types (such As Right-handed And Left-handed) of The Release Buckle? Do You Need To Use It in Conjunction with Specific Connectors?

1、 The core difference and "emphasis" between right-hand thread and left-hand thread

The rotation direction of the thread (right/left) refers to the forward direction of the thread when it rotates, and the core differences are reflected in operating habits, anti loosening requirements, and adaptability to specific scenarios:

1.1. Right hand thread (most common)

Features: When rotated clockwise, the thread is tightened, and when rotated counterclockwise, it is loosened, which conforms to the operating habits of the vast majority of people (clockwise force with the right hand is more natural).

Applicable scenarios: More than 90% of conventional shackles are right-hand threaded, suitable for lifting and fixing scenarios without special anti loosening requirements, such as general equipment lifting, cargo bundling, etc.

1.2. Left hand thread (special scenario)

Features: When rotated counterclockwise, the thread is tightened, and when rotated clockwise, it is loosened, contrary to conventional operating habits.

Core function: prevent loosening. In specific scenarios, if the connector may experience natural loosening of the right-handed thread due to external forces such as vibration or rotation, the left-handed thread can offset the risk of loosening through "reverse force".

Example:

When connected to rotating equipment such as motor shafts and winch drums, the rotational force during equipment operation may cause the right-handed thread to loosen, and a left-handed thread release is required at this time;

Paired use of shackles (such as symmetrical force connections on both sides), with one side using right-hand rotation and the other side using left-hand rotation, can avoid simultaneous loosening on both sides due to overall rotation.

2、 Requirements for the fit between thread types and connectors

The thread type of the shackle must be strictly matched with the matching connecting parts (such as the threaded end of the hook, lifting ring, and wire rope sleeve), otherwise it will result in inability to connect or pose a safety hazard after connection:

2.1 Same rotation direction coordination:

A right-handed shackle must be paired with a right-handed threaded connector, while a left-handed shackle must be paired with a left-handed threaded connector.

If the rotation direction is reversed, forcibly connecting will cause the thread to jam, slide, and even damage the thread structure, making it impossible to achieve effective locking.

2.2 Thread parameter matching:

In addition to outward rotation, the nominal diameter (such as M10, M20) and pitch (coarse/fine) of the thread should also be consistent with the connecting piece. For example, the M20 coarse tooth shackle (with a pitch of 2.5mm) must be paired with an M20 coarse tooth connector. If it is paired with a fine tooth (with a pitch of 2mm) connector, problems such as loose connection and uneven force distribution may occur.

2.3 Special identification distinction:

Left turn threads usually have clear markings (such as "L" or left turn arrows engraved on the thread end), and should be distinguished when selecting and using to avoid confusion with right turn threads.

3、 Summary

Right hand thread: Universal in conventional scenarios, in line with operating habits, no special attention is required, just match with connectors of the same specifications.

Left hand thread: Only used in special scenarios where there is rotational vibration and anti loosening is required. It must be matched with left hand thread connectors and the rotation direction must be confirmed through identification to avoid misuse.