Eye Bolts

Eye bolts are used for lifting and moving loads, as well as for holding them suspended during installation work.

On one side the part has a thread used to attach it to the load being lifted, and on the other — a ring through which the rope is passed. DIN eye bolts with a swivel loop or in an extended version are made of durable materials capable of withstanding heavy loads.

For use in unfavorable weather conditions, the products may have a zinc-plated or other protective coating.

Design of eye bolts

Structurally, an eye bolt is a threaded stud with a ring on one side for attaching a rope. Due to the critical nature of this fastener, it is manufactured from grade 20 or 25 steel. Certificates of conformity are required both for the steel used to make the fastener and for the finished product. All relevant requirements are set out in GOST 4751 — external damage, stripped threads, cracks, cavities and dents are not permitted.

The outer coating of DIN 580 eye bolts can be applied by zinc plating. This allows the fastener to be used in unfavorable external conditions while preserving its quality. The full list of permitted coatings is also established by GOST 4751.

Materials used for eye bolts

The requirements for extended or swivel-type DIN eye bolts are strict, so the material from which they are made must meet all quality and reliability parameters. High-carbon steels of grades 20 and 25 are used to manufacture the fasteners. This steel has good welding and forging properties and corresponding strength characteristics. The products are manufactured by stamping or forging. All fasteners are mandatorily tested for strength in accordance with GOST.

The carbon content of the steel is regulated by GOST 4751-73. For grade 20 steel this value is 0.17–0.24, and for grade 25 steel — 0.22–0.30.

Operating features of eye bolts

The use of these products is subject to a number of special conditions:

1. Lifting a load is not permitted if the rope deviates by more than 45 degrees from the vertical axis, since in this case the load capacity of the eye bolt drops sharply and the bolt’s axis may become deformed. This can lead to unpredictable consequences, including bolt failure.
2. The use of eye bolts with an inadequate load capacity is not permitted. The load is regulated by GOST 4751-73.

Marking and designation of eye bolts

Eye bolts are widely used across many different fields. They are most commonly found in machine building, construction and shipping.

In each specific case, bolts matching the required load capacity must be used. Eye bolts have a lifting range from 80 kilograms to 40 tons. They also differ in thread size:

• M8,
• M10,
• M12,
• M16,
• M20,
• M24,
• M30,
• M36,
• M42,

and many others.

Fasteners are packaged in wooden crates lined with packing paper. The product marking carries the main information on load capacity, thread size, strength tests performed, and manufacturer details. This information is indicated on a tag accompanying each batch of product. It is also permitted to indicate the information on the bearing surface of the bolt. The marking includes data on the thread and the manufacturer.

How to choose correctly?

First, attention should be paid to the size of the product. This determines how heavy a load can be lifted with it. The larger the shank diameter, the stronger the part and the higher the loads it can withstand. The size is identified from the marking: for example, M8 means the shank diameter is 8 mm. GOST 4751 eye bolts marked M8 are designed for loads of up to 140 kg. It is also important to take into account the number of items per package. Parts are usually sold in packs of 2 to 25 pieces.

FLOK supplies eye bolts of various load capacities. The products are divided into corresponding sections, which makes it easier to find the item you need. All fasteners offered come with certificates of conformity for quality.

Size	A	B	D	E	F	G	H	Working load along the axis, t
M10	10	22	7	15	9	20	178	0.25
M12	12	28	10	19	11	25	178	0.40
M14	14	36	12	24	14	32	178	0.50
M16	16	36	12	24	14	32	178	0.80
M18	18	43	14	28	17	38	178	1.00
M20	20	43	14	28	17	38	178	1.60
M22	22	43	14	38	17	38	178	1.60
M24	24	57	19	38	22	51	178	2.50
M30	30	71	24	48	28	64	178	4.00

Designations:

A – thread diameter, mm

B – collar diameter, mm

D – collar height, mm

E – inner diameter of the eye bolt ring, mm

F – ring thickness, mm

G – distance from the center of the ring to the end face of the collar, mm

H – thread length, mm