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Guaranteeing quality

Consistently high quality is the top priority for Lederer. This applies to the quality of both products and services.

All incoming and outgoing parts are subjected to a systematic quality analysis and assessment. Physical and chemical properties are examined with modern measuring instruments and compared with the desired properties. These permanent tests force our suppliers to deliver nothing but high quality products. Lederer does not cooperate with manufacturers that fail to maintain the required standard.

Within individual agreements with the customer, it is even possible to carry out a 100% inspection, i.e. each individual part is subjected to an inspection before it goes from the warehouse to the shipping department. In this way, even exceptional and the very highest quality requirements can be met.

The employees in Lederer's own testing department have the most modern tools at their disposal: from mechanical measuring instruments such as micrometers, depth gauges and plug gauges to materials testing equipment and projectors to the latest X-ray and spectral analysis equipment as well as automatic optical contour measuring devices. All measurement and test results are documented in software specially developed for this purpose and made available on request.

The criteria that can be examined include the following:

  • dimensions
  • coatings
  • hardness according to Rockwell (HRC) and Vickers (HV)
  • thread
  • material types

In addition to its QA testing department, Lederer GmbH has its own testing laboratory accredited in accordance with ISO/IEC 17025. In this lab, even more detailed investigations can be carried out and certificates issued.

The Lederer testing laboratory can carry out the following activities:

  • Tensile tests for full-size bolts and screws
  • Tensile tests under wedge loading
  • Proof load test for nuts
  • Breaking torque test
  • Notched-bar impact bending test at lower (down to -110° C) and higher temperatures
  • Drill speed test for self drilling screws
  • Hardness test for core and surface hardness
  • Miscellaneous manual tests
  • Chemical evaluation
  • Coating thickness test
  • Salt spray tests

In many branches of industry, moreover, fasteners with TÜV (German technical testing institute) approval are required. Lederer is one of the few suppliers whose product assortment depth now leaves hardly a wish in this area unfulfilled. The articles in question are given the designation „TÜV approved in accordance with AD-W7/2“ and the material specification „A 2-70 / A 4-70“ in the Lederer catalogue.

The following test certificates can be issued: