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Thread Testing Gauges
Contour Measuring Machine
Thread Gauge Ring
Magnetic Particle Testing


GÜLDNER's certified quality management begins with the inspection of the material to be processed by means of X-ray fluorescence analysis (XRF) and continues throughout the entire production process up to dispatch.
All results of the dimensional inspection as well as all attributive characteristics are determined and documented in accordance with the inspection planning and the subsequent test data acquisition.

We are a TÜV-approved manufacturer according to AD 2000-Merkblatt W0, the regulations of Germanischer Lloyd, the VdTÜV-Merkblatt 1253/4 as well as AVS D 100/50.
Our certified quality management system according to ISO 9001 and KTA 1401 also fulfils the requirements of the Pressure Equipment Directive 2014/68/EU.

raw material

Raw Material

We obtain our raw material exclusively from certified steel traders and factories with corresponding test documentation.

Every incoming goods item is checked by us for mix-ups using X-ray fluorescence analysis (XRF) (PMI - Positive Material Identification).

Our material is stored and labelled in batches. Austenitic and ferritic steels are stored separately to avoid contact corrosion.

mix-up check

X-ray fluorescence analysis (XRF), also known as X-ray fluorescence spectroscopy (RFS), is a method from the field of material analysis.

XRF is one of the most frequently used methods for the qualitative and quantitative determination of the elemental composition of a sample, because the samples are not destroyed by the measurement.

At Güldner, this method is used to check every incoming raw material sample for mix-ups and to document the results in a traceable way.

Upon customer request, this method is also used for testing the finished fasteners.

acceptance test


For your products we can supply you with various test reports and certificates according to DIN EN ISO 10204 on request:

  • Certificate of Compliance with the Order 2.1
  • Certificate of Compliance 2.2
  • Inspection certificate 3.1 and 3.2

Acceptance test certificates according to 3.2 are issued according to the specifications of TÜV, GL, DNV, BV, LR, RINA as well as according to customer specifications or official regulations.
In addition, we offer initial sampling, IMDS entries or other test documentation especially according to your specifications and requirements.

penetrant test

The Penetrant Test (PT) is a non-destructive test method for the visual detection of surface cracks. The method is used for non-magnetizable steels (e.g. austenitic steels), among others.

Due to chemical-physical properties (capillary effect), a liquid (penetrant) applied to the residue-free cleaned surface of the test object penetrates into the defective surface areas. After intermediate cleaning of the test surface, this penetrant is made visible by a so-called developer (usually white powder) as a contrast background. Red dye penetrants are often used, which produce red indications on a white background ("red/white testing"). By using fluorescent penetrants in combination with UV radiation, the contrast of a display can be significantly enhanced.

magnetic particle test

The Magnetic Particle Test (MT) is used for the detection of surface defects (cracks) in ferritic materials (mainly steel). The method has the advantage of a very high sensitivity for the detection of surface defects.

By using different magnetization techniques, a magnetic field is applied to the workpiece to be tested. Close to and in the surface of the workpiece, where the magnetic properties (relative permeability) of the material change significantly (e.g. cracks), the magnetic field emerges from the surface as magnetic leakage flux. This effect can be visualized by colored (usually black or fluorescent) magnetizable particles (magnetic powder), which are applied to the test object during the test.

Compared to other non-destructive testing methods, magnetic particle testing can be safely used even with complicated material geometry and unmachined surfaces.

tensile test

We carry out tensile tests according to standard or your specifications. Our machine has a tensile force of 600 KN (60 tons).
All results are electronically recorded and archived.
The machine is additionally equipped with a strain gauge. This allows all relevant mechanical values to be determined.

tensile test

batch traceability

batch traceability

100% traceability

Güldner offers you complete traceability as standard for articles ordered with an inspection certificate from the finished component to the raw material. The documentation in the individual production steps can also be traced at any time. For articles ordered without an acceptance test certificate, we can separate individual production batches from each other via the internal batch generated by the system.

With each goods entry in our finished parts warehouse, the system generates a unique works number, which is printed on the delivery documents, any inspection certificate and the label of the article packaging. This enables you to always clearly associate our goods with the accompanying documents.