Eye Nuts

Eye nuts belong to rigging products. The fastener secures chains and wire ropes through a threaded connection. Eye nuts are used in various industries — for moving loads and holding them suspended during work operations.

The design of the eye nut is simple: a ring is attached to a closed cap, through which a wire rope or chain is threaded. Thanks to durable materials, the product withstands significant weight. For use in unfavorable conditions, the eye nut may have an additional metal coating — a zinc-plated eye nut is not subject to corrosion.

Design features

The eye nut is a fastening product with a ring for gripping elements during transport. It is screwed onto a bolt with a thread that can be either inch or metric.

Eye nuts are manufactured to the DIN 582 standard. This standard is an equivalent of the national GOST. The material is stainless steel with anti-corrosive properties, resistant to aggressive environments with elevated humidity or acidity.

The outer coating under the DIN 582 standard can be zinc-plating — this allows the fastener to be used in unfavorable conditions without loss of performance characteristics.

The finished stainless steel product withstands heavy loads. GOST 22355-77 defines the dimensions of the washers that may be used together with the eye nut. The prefix “rym” translates as “ring.” The thread of an M10 eye nut matches the thread of a component bearing the same designation.

A design feature is the ability to tighten it with greater force than with a wrench: a rod can be inserted into the ring and turned like a lever. The finished fastening is used for suspension.

Materials used to manufacture eye nuts

The fastener operates under high load, so the material must meet strict strength and wear-resistance requirements — this reduces the risk of injury-causing situations.

These requirements are met by carbon austenitic steel grades C15, A2 and A4. Some manufacturers produce nuts from high-alloy stainless steels containing more than 10% alloying elements — this increases strength, hardness, and resistance to mechanical deformation.

After processing, the eye nut can be used in contact with certain acids.

Operating features

Before use, the strength characteristics of the product must be checked. Using an eye nut requires compliance with the following rules:

1. The ring must not have mechanical defects or deformations. Welding or other repair of defects is not permitted.
2. The load on the eye nut must not exceed the value set by its strength characteristics. The load is regulated per DIN 582.
3. The surfaces of the bolt and nut must be cleaned beforehand.
4. The deviation of the wire rope during use must not exceed 45°. When deviated, the load on the fastener increases by at least 100 kg.
5. Transport using an eye nut is permitted only with smooth movement of the load.

Eye nut marking

This type of fastener is used in various production processes. The working load can reach 16 tonnes. The product marking uses the following designations:

• M6;
• M8;
• M10;
• M12;
• M14;
• M16;
• M20.

Packaging is done in wooden boxes with packing dividers. The marking indicates the load capacity, other performance characteristics, and the manufacturer of the product. This information is duplicated on the product’s accompanying tag.

How to choose correctly

Eye nuts are selected based on load capacity ratings. The convenience of carrying depends on wall thickness and thread: the greater the wall width, the higher the load the fastener can withstand. For example, an M8 nut is used for a bolt with a diameter of 8 mm, and its working load must not exceed 140 kg.