Fasteners

The category includes components for industry with vital roles in the assembly, connection, braking, or stabilization of moving parts. Among the components:

• Locating pins (fixing) with/without thread – DIN6325 / DIN7979
• Springs according to ISO 10243, JIS B5012 standards, or custom-made
• Gas springs for reciprocating movements/damping
• Nitro roller pistons
• Drill bushings DIN172 / DIN179
• Shoulder screws ISO7379 and ball screws for plungers

The products are suitable for fields such as injection molds, automation, production machines, CNC, and robotics.

A threaded locating pin allows for easy disassembly and assembly, especially when frequent removal or precise fastening is required. A non-threaded pin is mainly used in permanent connections or when frequent access to the part is not needed.

Gas Springs offer high performance and clear advantages over conventional (mechanical) springs, especially in industrial applications and injection molds. Here are the main advantages:

• Less Space: A gas spring occupies less area and height, eliminating the need for fastening mechanisms and guides.
• Lower Height: Allows for use in a smaller height for the same stroke and force – leading to more compact tools.
• Controlled Force: The pressure remains constant over time, precise, and uniform – measurable and easy to monitor.
• Large Initial Force: No pre-load is needed; the force is available from the first stroke.
• Almost Steady Force: Less change in force = higher part quality and fewer rejects.
• Adjustable Force: The force intensity can be adjusted as needed – by changing the internal gas pressure.

The overall result: Time-saving, reduced mold volume, more precise production, and cost reduction.

The ISO7379 shoulder screw (collar screw) is used for pivots or precise connection of moving parts, thanks to its precise shoulder. It ensures a fixed and accurate distance between parts – critical for moving or rotating mechanisms.

A drill bushing is a rigid cylindrical component designed to guide and stabilize a drill bit during drilling, especially when maximum precision or repetitive work is required.

When would we use a drill bushing?

• When there is a requirement for precise drilling at a fixed angle, depth, or location.
• When working with molds or fixtures that require industrial repeatability.
• In cases where wear of the mold body or tool needs to be prevented.
• When using production series, especially in semi-automation fixtures or CNC machines.

Common types of bushings:

• Press-Fit Bushing: Inserted under pressure into the mold body.
• Renewable Bushing: Easily removed and replaced for maintenance.
• Headed Bushing: Includes a flange for better anchoring.

Materials: Bushings are usually made from hardened tool steel with a hardness of 58–64 HRC, for high wear resistance.

Relevant standards: DIN172, DIN179, ISO 4248.

Using drill bushings extends the life of the mold body, improves work quality, and reduces drilling errors.

Choosing an industrial spring is done according to three main parameters:

• Required load (F): The force the spring needs to exert or absorb (in Newtons, N).
• Stroke (x): The actual compression distance (in millimeters).
• Spring constant (k): The stiffness level – how much force is required to compress the spring by 1 mm.

Calculation formula:
F = k × x
For example: If the spring needs to produce 200N when compressed 20 mm, then:
k = F / x = 200 / 20 = 10 N/mm

Usage recommendations:

• Use the spring within 25–40% of its maximum compression – no more.
• Maintain a safety margin (Pre-load) to prevent full closure.
• Choose a spring suitable for cyclical work – with high resistance to material fatigue.

Color classification according to ISO 10243 standard:

Custom springs can also be ordered according to drawing, material, load rating, and stroke.