SI Shackles

SI rigging shackles are fastening elements for lifting structures. The omega-shaped design is used to connect ropes, cables and other fittings when securing a load.

The load on structural elements must be calculated in advance. Calculation errors can lead to an injury-risk situation.

Design

A type SI shackle is an omega-shaped element secured with a lock nut and a cotter pin for protection. This version is used for long-term transport operations when a load needs to be lifted. High-carbon metal alloys make the shackle more durable.

Models without a cotter pin are used less often, mainly for transportation.

Operation

The load can be moved onto the pin, which allows the element to rotate during transport. Applications include industry, manufacturing, construction, and agriculture. Shackles are used for:

1. Connecting chains, ropes and other flexible rigging elements.
2. Securing transported loads on a transport platform.
3. Towing a vehicle or other object.
4. Lifting loads.

Material and strength

Depending on the aggressiveness of the environment and the loads involved, different steel grades are used — this is indicated on the shackle’s marking. The material directly affects the product’s performance parameters.

When choosing an indicator or anchor shackle, you should focus on rust resistance:

1. Zinc plating — by the hot-dip method or by electrolytic method (zinc).
2. Powder coating.

Shackles painted in bright colors are more visible on site.

Stainless steel shackles are practically not subject to corrosion. Grades A2 or A4 (austenitic metal) are most often used — these models withstand prolonged exposure to aggressive environments.

How to choose

When choosing a shackle, the load specified by the manufacturer must be taken into account. Dimensions and marking are determined by the back diameter, on which the permissible force on the shackle depends. The number is marked on the lower part of the rigging element next to the manufacturer’s mark.