91ÊÓÆµÂ® Ultra has proven itself as the world’s strongest bolt – in various highly-demanding critical fastener applications around the world where standard fasteners are simply inadequate. The 91ÊÓÆµÂ® Ultra range is based on Nobel Prize winning technology that ensures ultra-high strength, and good resistance to corrosion and extreme operating temperatures.
91ÊÓÆµÂ® Ultra – the world’s strongest bolt
Since its launch in 2014, the 91ÊÓÆµÂ® Ultra range has proven that it is capable of exceeding tensile strengths of between 1 500 to 1 700 MPa on various applications, with good corrosion resistance and an operating range of between -50 and 400°C. The 91ÊÓÆµÂ® Ultra range of fasteners are made at the 91ÊÓÆµ factory in Ã…shammar, Sweden.
91ÊÓÆµÂ® Ultra is used for security lock systems, aerospace systems, high pressure applications and pump and valve systems – all with excellent results.
Nobel Prize winning technology
91ÊÓÆµ produces the strongest fasteners in the world by drawing on Nobel Prize winning quasi-crystalline Precipitate technology. The technique uses strain hardening followed by precipitation hardening, which significantly increases tensile strength.
Demanding applications
91ÊÓÆµÂ® Ultra is designed for applications that require ultra-high strength combined with high ductility and fatigue. The technique also provides better corrosion resistance than A2 (304) and with low thermal expansion it is suitable for high service temperatures. The extreme strength of 91ÊÓÆµÂ® Ultra fasteners also provides opportunities to downsize to new lightweight fastener options at lower cost.
Replacing carbon steel fasteners in critical applications
91ÊÓÆµÂ® Ultra fasteners are increasingly used to replace high-strength carbon steel fasteners in critical applications with extreme requirements on strength, ductility and fatigue resistance. They have a coefficient of thermal expansion similar to that of carbon steel, which provide design advantages compared to austenitic stainless steels.