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Spring Clamp DIN 3021

The spring clamp DIN 3021 is a standardized fastening element used for sealing flexible hose connections to fittings. It is manufactured as a ring made of spring steel with a slit and bent ends, allowing the clamp to expand during installation. Its main function is to provide continuous clamping force due to the material's elasticity.

The spring design compensates for temperature fluctuations, vibrations, and the expansion or compression of hose walls. DIN 3021 offers a reliable solution for connections in environments with dynamic loads and changing operating conditions.

Technical Characteristics of DIN 3021

Key parameters of the clamp:

• Shape: spring steel ring with a slit and two mounting tabs

• Material: spring-grade carbon steel or stainless steel

• Wall thickness: approximately 1.0–2.5 mm depending on size

• Coating: zinc, phosphate, or nickel for corrosion protection

• Operating temperature: -40 °C to +120 °C (carbon steel); up to +200 °C (stainless steel)

• Working principle: clamping force through elastic compression after installation

• Installation: with a special tool or standard pliers

This clamp type has no threaded parts, eliminating the risk of loosening, self-unscrewing, or the need for maintenance.

Strength Class of DIN 3021

DIN 3021 clamps are not classified by a specific strength grade, but their performance depends on the properties of the steel used:

• Carbon steel

• Alloy spring steel

• Stainless steel

Fastening Group – Spring Clamp DIN 3021

DIN 3021 belongs to the group of spring clamps without threads. It performs the following functions:

• Sealing the connection between hose and fitting

• Compensating for temperature and pressure fluctuations

• Secure fixation without loosening risk

• Operation in environments with vibration or dynamic loading

It is mainly used in low- and medium-pressure systems. Compared to screw-type clamps, it provides better adaptability to hose diameter changes, especially during thermal cycles.

Materials Used in DIN 3021

Special steel grades are used in manufacturing to ensure elasticity, strength, and corrosion resistance:

• Carbon spring steel

• Alloy steel

• Stainless steel

Material selection depends on operating temperature, environment, moisture or chemical exposure, and mechanical strength requirements.

Application Areas of DIN 3021

DIN 3021 clamps are widely used across industries where reliable and sealed hose-to-fitting connections are required:

• Automotive industry (cooling, ventilation, fuel supply systems; secure hose fixation under vibration and temperature variations)

• Mechanical engineering (crimping technical tubing in cooling, lubrication, hydraulic systems)

• Household appliances (hose fixation in washing machines, dishwashers, water heaters)

• Agricultural machinery (water and hydraulic systems requiring simple installation)

• Construction (temporary and permanent pipe connections in ventilation and drainage systems)

It is especially effective when hose diameter changes due to temperature or deformation need to be compensated without compromising sealing. The clamp can be quickly installed and removed without specialized tools.