Bolts with internal hexagon

This is a modern type of fastener widely used in mechanical engineering, equipment manufacturing, construction and other sectors where compactness, high strength and reliable connections are essential. Thanks to the design of the head, installation is carried out using a hex key, allowing work to be carried out even in hard-to-reach places.

The Dinmark online store offers a wide selection of fasteners for professional and industrial use. You can purchase these bolts in various sizes, strength grades and coating types, with delivery throughout Ukraine.

Types of bolts

Hexagon socket head bolts differ in head design, thread type and area of application. The most common types are:

• cylindrical DIN 912;
• countersunk DIN 7991;
• short hexagon socket head;
• high-strength for industrial loads;
• stainless steel for use in damp environments.

This type of fastener ensures a reliable connection between parts and convenient installation in structures with limited access.

Technical standards

Manufactured in accordance with international standards: DIN; ISO; GOST; AN;

Compliance with standards guarantees geometric accuracy, fastener compatibility and consistent strength characteristics.

Materials and coatings

The following materials are used in the manufacture of bolts: steel; A2 and A4 stainless steel; high-strength alloys.

The following are used for corrosion protection: zinc; yellow zinc; hot-dip galvanising; Dacromet;

A stainless steel bolt with an internal thread and a protective coating is well suited for use in harsh conditions and in high-humidity environments.

Bolt strength classes

Bolts are manufactured in strength classes ranging from 4.8 to 12.9. The most common are:

• 8.8 - for standard industrial applications;
• 10.9 - for increased loads;
• 12.9 - for critical assemblies and mechanisms.

A high-strength hexagon socket bolt provides resistance to vibrations and significant mechanical loads.

Table of bolt equivalents and interchangeability: DIN, ISO, GOST

Many standards have interchangeable equivalents. For example:

DIN	ISO	GOST
DIN 912	ISO 4762	GOST 11738
DIN 933	ISO 4017	GOST 7798
DIN 931	ISO 4014	GOST 7805
DIN 7991	ISO 10642	GOST 17475

The cross-reference table helps you quickly find interchangeable fasteners for the repair, manufacture or modernisation of equipment.

Areas of application and specific features

Hexagon socket bolts are widely used in many industries due to their compact size and high reliability.

Mechanical engineering

In mechanical engineering, hexagon socket bolts are used for assembling engines, gearboxes, transmissions and other critical assemblies.

Automotive industry

Hexagon socket bolts ensure a precise and secure connection of components in automotive systems and mechanisms.

Construction and steel structures

These fasteners are used in the installation of steel structures, façade systems and industrial equipment.

Equipment manufacturing

Frequently used in machine tools, electrical equipment and production lines.

Aerospace and defence industry

Used in structures where minimal weight, strength and precision of assembly are critical.

For a comprehensive selection of fasteners, we also recommend browsing the following categories:

• hexagon head bolts
• HV structural bolts

Size chart and selection of wrenches for hexagon socket head bolts

Thread size	Wrench size
M4	3 mm
М5	4 mm
M6	5 mm
M8	6 mm
M10	8 mm
M12	10 mm
M16	14 mm

A correctly selected spanner ensures precise installation and prevents damage to the bolt head.

Wholesale prices for bolts in the DinMark online shop

The price of a hexagon socket bolt depends on:

• the material used;
• the strength class;
• the type of coating;
• the standard;
• the product size.

At Dinmark, you can buy hexagon socket bolts wholesale and retail at competitive prices. Special terms of cooperation and personalised discounts are available for wholesale customers.

If you need to buy hexagon socket bolts wholesale for manufacturing or installation, our managers will help you choose the best option for your needs.

BENEFITS OF SHOPPING AT THE DINMARK ONLINE STORE

1️⃣ a wide selection of fasteners for various applications;

2️⃣ certified products from trusted manufacturers;

3️⃣ competitive prices for retail and wholesale customers;

4️⃣ Fast delivery throughout Ukraine;

5️⃣ Professional advice on selecting fasteners;

6️⃣ Additional discounts when ordering online.

Questions and Answers

1. Which products in the above category are in high demand?

The most frequently ordered items are DIN 912, DIN 7991 countersunk models, as well as high-strength hexagon head bolts of grades 8.8 and 10.9.

2. Which products should you buy in 2026 in the internal hex bolt category?

In 2026, stainless steel models and high-strength models for mechanical engineering, metal structures and manufacturing equipment are in high demand.

3. Where can I buy hex socket bolts?

You can buy bolts and other fasteners in bulk from the Dinmark online shop, with delivery throughout Ukraine.