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Special hydraulic bolt tensioners

Blackiron designs and manufactures special custom tensioners for all needs, suitable for bolts up to 7″ and more.

Serie BI-HP-2275

BMT Mechanical nuts

Blackiron mechanical nuts are versatile and resistant and following the highest manufacturing standards. They allow to tension the bolts without the use of pressurized hydraulic oil. By tightening the jackbolts at a predefined force it will be possible to apply a residual load to the bolt itself. Available up to 6100 kN nom. preload, can be designed in special material upon request.