Hooks

A load hook is a product for securing and moving various loads. It is the most common type of rigging element. Several types of hooks are produced with different characteristics for quick attachment and movement of the load.

Purpose

A lifting hook is a universal rigging element designed for use with cranes. It is part of an assembly called a hook block. It is used on equipment for moving products or workpieces: cranes, crane beams. Any hook block includes a locking device that prevents the load from detaching during operation.

Models with a block axle are produced serially, ensuring movement in the direction indicated by the operator. The hook is used for quick connection and disconnection of block elements with the product or workpiece. Most crane mechanisms are designed for the hook to descend under gravity.

Hook material

Load hooks are made from various grades of steel. Casting, forging and stamping methods are used in production. Cast models are rarely used, since internal hidden defects and voids are possible, reducing strength. However, they are used for moving loads of up to 2 tonnes on crane machines.

Common hook types

The following types of load hooks are produced serially:

• Weld-on;
• Wide-mouth;
• Sling hook;
• Chain hook;
• Swivel;
• Double-prong;
• Curved.

The wide-mouth model is used for non-standard load dimensions.

Lock features

A lock on a load hook is an element for securing the load and increasing the strength of the attachment. Per GOST 6627-74 and other regulatory documents, it is permitted to use a hook without a special lock only with a wide-mouth model, and only if the load is not intended to be transported over a crowd of people.

On forged crane hooks

A load hook made by forging or stamping is made from grade 20 or 20G steel. Large and expensive equipment is used to remove possible defects typical of casting production. Forged load hooks are produced in the following modifications:

1. Single-prong for manually operated machines. Rated for a carried weight of up to 20 tonnes, depending on thickness and steel grade.
2. Double-prong. Used on manually operated rigging machines. Load capacity ranges from 8 to 20 tonnes.

Models for automatic use are distinguished by strength and reliability.

How to choose?

Factors influencing hook selection for production tasks: load capacity, weight, breaking strength. Temperature, the degree of environmental impact on the metal, and available crane equipment need to be assessed.

Chain size, mm	Working load, t	Breaking load, t	A, mm	B, mm	C, mm	D, mm	E, mm	Weight, kg/pc
6	1.12	4.48	22	30	28	152	20	0.71
7/8	2.0	8	28	36	36	182	26	1.3
10	3.15	12.6	38	42	45	216	36	2.1
13	5.3	21.6	44	48	55	279	41	4.67
16	8.0	32.8	58	62	65	340	50	7.33
20	12.5	50	70	75	78	460	55	12