The studs stay in place
Ramnäs Bruk has developed an asymmetrical stud that is carefully installed and expanded to exact tolerance that was established through years of research and development. The asymmetrical design of the stud gives equal stud footprints and contributes to a symmetric stress-distribution in the link. This design combined with Ramnäs Bruk's controlled stud expansion, is the standard method in Ramnäs Bruk production process since 1991. The in-built "spring" effect makes a tremendous difference in avoiding loose studs. The experiences during the years are that the percentage of loose studs has been reduced from an average of 30% to 70% to almost zero. The studs stay in place resulting in a superior safer chain.
The asymmetrical stud design and the procedures for controlled stud expansion are approved by ABS, DNV and LRS.
Cost comparison
A cost comparison gives that the repair costs are cut from US$ 93,000 to 899. This is based on the repair costs for tightening a stud: US$ 7,75 and a 40 000-links chain, a normal rig-set, with 30% loose studs.
Listen on the spring effect
Can you hear the difference?
Click on the images
  Ramnäs Bruk's stud expanded link - The ring of Quality
Summary - Studlink chain
+ Higher proof load(Grade 3S & 4)
+ Increased fatigue life
+ Reduced risk of stress corrosion in the weld
+ Improved utilisation of the base material ductility
+ Increased peak loads without any deformation
+ Facilitate installation, no kink and knots
- Increased weight, approx. 9%
- Investment cost
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