DIN and standard parts

Direct screw-fittings

Direct screw-fittings are screwed directly into the mounting material without a pilot hole.

Efficient installation solutions

Direct screw connections provide considerable potential cost savings

With direct screw-fittings, the screw is screwed directly into the mounting material. Depending on the application, component and fastener, the screw can also be inserted into the component without a pilot hole.

Method and principle

Overview of direct screw-fittings

Material

In addition to steel with different coating systems, available materials include stainless steel.

Surfaces

Our products can be coated with different surface finishes depending on requirements and application. We will be pleased to give you individual advice on the right coating system.

We offer the following surfaces as standard:

Plain
Zinc plated (industry standard)
VZD (zinc plated with thick layer passivation)
Zinc-nickel
Zinc flake

Working principle of direct screw-fittings

The special thread geometry enables a thread to be created in the material of the component to be screwed. Various factors determine which fastener is the right choice and how the screw will perform. These include the installation process, the material to be screwed in and other application-specific requirements:

Cutting

A machining process that is used particularly for hard materials.
Furrowing

Uses the deflection of the fibre geometry of the internal thread to partially consolidate the receiving thread.
Displacement

A mechanism for porous and fibrous materials.

Find the right solution for your application

Types of direct screw-fittings

Tapping screws
The screw thread runs all the way from the tip to the head. Special types are available, such as a heavy-duty tip tapping screw, which penetrates the sheet to be joined so there is no need for prepunching. Double-thread types that take less time to screw in are also available.

Standards

DIN 7981 C, similar to ISO 7049

DIN 7981 F, similar to ISO 7049

DIN 7976, similar to ISO 1479

DIN 7982, similar to ISO 7050

DIN 7983, similar to ISO 7051

B 52030
Screws for plastic
Thermoplastic plastics are being used increasingly as materials. Screws for these components must achieve high-strength, long-lasting and economical connections, even under high loads. Self-tapping screws for plastic can be installed in a predrilled hole. The special thread geometry also enables thin-walled constructions. It also creates a self-locking effect which prevents the screw connections from working loose.

Standards

E 1452

E 5451

E 1413

E 1412

E 1411

E 5454

E 5151

B 52004

B 52005

B 52006
Thread-rolling screws for metals
Thread-rolling screws for metals create their own thread during assembly. This requires pre-punching. Once the screw has been installed, it often creates a hole with a metric thread. This means that the thread-rolling screw can be exchanged for a metric DIN or ISO screw during servicing. As a result, these screws can be used efficiently for a wide variety of applications.

Standards

DIN 7500 C

DIN 7500 C (E)

DIN 7500 E

DIN 7500 M

DIN 7513

DIN 7516

EJOT ALtracs® Plus E5151
Hexagon wood screws
The hexagon head can be gripped externally and the large head better distributes the surface pressure, enabling greater force application particularly for softer types of wood. Installation methods vary (socket, open-end spanner or ring spanner). This type of screw is mainly used in wooden structures. However, it can also be used with other materials (e.g. as dowels in masonry). Depending on the material and the diameter of the screw, a pilot hole may be necessary.

Standards

DIN 571
Pressboard screws
Pressboard screws are particularly suitable for use with wood materials. With their sharp point, they can usually be screwed into the base material without a pilot hole. The narrow core diameter reduces radial stresses and enables a large flank overlap on the coarse thread. This increases the pull-out strength and resilience of the construction.

Standards

B 7505