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Testing of Fasteners

Fasteners such as hooks and eyelets made of metal, as well as screws, nuts, bolts and rivets are used to join components and metal sheets and sections that must not separate under load. Fastener technology in general, particularly welding and associated technologies, also belong to this group. Relevant standards are DIN EN ISO 9015-1 and -2, as well as DIN EN ISO 14271 and DIN ISO 22826.

Screws/bolts and nuts Shear tests Fatigue tests Metals brochure

Testing of screws/bolts and nuts

The majority of fasteners fall under the category of nuts and bolts in seemingly endless variations; they are one of the most important fastening elements and can be found essentially everywhere. They are used in the construction of complex machinery and equipment, as well as vehicles and buildings. Since mechanical stress is concentrated on these types of connection points, the integrity of fasteners is extremely important.

A wide variety of tests apply to screws/bolts and nuts. This includes tensile tests and hardness tests as well as fatigue tests, torsion tests or Charpy impact tests.

Testing of Threaded Fasteners
DIN EN ISO 898-1, ASTM F606-1, DIN EN ISO 3506-1
to Testing of Threaded Fasteners
Testing of nuts / washers
DIN EN ISO 898-2, ASTM F606-2, DIN EN ISO 3506-2
to Testing of nuts / washers

Products for tests screws/bolts and nuts

Shear tests on fasteners

In addition to single-axis tensile loading, shear loads also occur in fasteners in service and can quickly cause a joint to part. Shear tests on joined parts or specimens are therefore essential, particularly where riveted joints are involved. Accurate load application is essential to prevent other forces arising in addition to the shear force and distorting results. ZwickRoell works with you to develop a specification for the correct gripping of the specimen or component and then produces the required arrangement. These test devices can be simple or very complex, but always do exactly what is required of them.

Products for shear tests

Fatigue tests on connection elements

In addition to static loads, fasteners in general are subjected to frequent cyclic loading, including vibrations. Fatigue tests are most quickly and efficiently performed in a vibrophore, which, when using special grips can apply cyclic loads with a maximum force of up to 1000 kN in a frequency range up to approx. 285 Hz. The magnetic drive, which generates controlled resonance in the system, including the specimen, requires minimal power during this test, resulting in highly cost-effective testing.

In what are referred to as H specimens, the individual joints are subjected to common cyclic loading in tension and compression direction, and the fasteners to a shear effect. H specimen holders designed for this test initially distribute the forces over the entire structure. The bending and resultant loosening of the structure can be measured with an extensometer. With the strain values, the testing machine—in this case again a vibrophore—can also control the forces or strain, depending on the test procedure.

Fatigue test on threaded fasteners DIN 969 & ISO 3800
ISO 3800, DIN 969, MIL-STD-1312
to Fatigue test on threaded fasteners DIN 969 & ISO 3800
High Cycle Fatigue Test / S-N Test
DIN 50100
to High Cycle Fatigue Test / S-N Test
Low cycle fatigue (LCF) test
ISO 12106, ASTM E606
to Low cycle fatigue (LCF) test

Products for fatigue tests

Additional tests for fasteners

Tensile test on metals
ISO 6892-1
to Tensile test on metals
Biaxial Test
to Biaxial Test
Creep Test
to Creep Test
Drop weight test on metals
DIN EN 10274, API 5L
to Drop weight test on metals
Flexure test on metals
ISO 7438, ASTM A370, ISO 8491
to Flexure test on metals
Rockwell hardness test metals
ISO 6508, ASTM E18
to Rockwell hardness test metals
Vickers hardness testing metals
ISO 6507, ASTM E384
to Vickers hardness testing metals
Brinell hardness test metals
ISO 6506, ASTM E10
to Brinell hardness test metals

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