Ultra Fasteners

Nedschroef Ultra Fasteners is a complete range of Ultra High Strength Steel Fasteners (grade 13.9 and higher). Ultra Fasteners have been developed to meet the increased demands placed on fasteners to enable efficient downsizing. The steel used for Ultra Fasteners is stronger than regular bolt steel. This means that smaller bolt designs can generate the same clamp force as before – or even higher clamp forces. Ultra Fasteners are made from a new generation of micro-alloyed martensite steels which combine ultra-high tensile strength with excellent toughness and resistance to hydrogen embrittlement. The steel is extremely clean and the unique chemical composition creates a very fine grain size and a dispersion of nano-sized particles, the two features which generate ultra-high strength levels, as well as the ability to trap hydrogen atoms. There is no need to change existing production methods and equipment.


Field of application


Ultra Fasteners allows reduction of the size and weight of combustion engines, which means lower CO2 emissions. Ultra High Tensile Strength Fasteners are designed for highly loaded internal engine joints, but may also be successfully used in other areas. Typical applications are: connecting rods, cylinder head joints, main bearing joints and fly wheels.
Besides a broad selection of standard solutions, Nedschroef offers the integrated production, design and systems engineering capacity required to create bespoke solutions for even the most specific and demanding requirements at an attractive price point. Our engineers are ready to work together with you to create the best solution for your own application...




  • Joining of highly loaded joints
  • Increased clamp force of existing joints


Specifications (14.9)


  • Rm: min 1400 N / mm ²
  • Rp0.2: min 1260 N / mm ²
  • HV10: 420-470
  • A5: min 9%
  • Z: min 48%



  • More compact designs
  • Supports highly-loaded designs
  • No risk of failure due to fastener material brittleness
  • In line with ISO898-1
  • Standard assembly methods and equipment may be used Nedschroef can offer nuts suitable for 14.9 screws/bolts
  • We can currently offer Ultra Fasteners as grade 13.9 and grade 14.9.