The clamping device is provided for tools and has a coupling piece that is provided with at least one actuating unit. The coupling piece acts to actuate a nut seated on a spindle journal that is receiving the tool. A torque coupling is provided for the nut. The coupling piece is fixedly connected with an output shaft that is in drive connection with a drive shaft by a transmission gear. As a result of the transmission gear, it is possible to rotate the drive shaft with minimal moment in order to apply the great clamping force required for axial clamping of the tool.

The present invention seeks to protect Applicant's HYTORC Z System which involves: tools having multi-speed/multi-torque modes with torque multiplication and vibration mechanisms without use of external reaction abutments; a force transfer means to yield in-line co-axial action and reaction for use with such tools; driving means and shifting means capable of attaching to washers under the nut for use with such tools and force transfer means; associated washers for use with such tools, force transfer means and driving means; and related accessories for use with such tools, force transfer means, driving means and washers. HYTORC Z Washers located under nuts or bolt heads of various types having engageable perimeters of multiple shapes, sizes, geometries and serrations, such as washer/fastener radius engagement differentials, and frictionally biased faces with relatively higher friction against the flange surface and relatively lower friction against the nut, such as friction coefficient increasing treatment means of various types, sizes and locations. HYTORC Z Guns incorporating a powerful impact mechanism and a precise torque multiplier in the same tool combining rapid run-down with calibrated torque. HYTORC Z Sockets with dual drive coaxial action and reaction having outer sleeves to react on Z Washers and an inner sleeves to turn nuts or bolt heads. HYTORC Z Spline Adapters and Reaction Plates for backwards compatibility with HYTORC's torque/tension systems including the AVANTI square drive system, the STEALTH limited clearance system, the pneumatic jGUN series, the FLASH Gun electric multiplier and more. HYTORC Z Washer and HYTORC Friction Washer combination including a dual friction-enhanced face washer for counter-torque under a nut or bolt head on the other side of the joint; and HYTORC Z Dual Drive Offset Links for tight clearances while using HYTORC's torque/tension systems.

A shear nut 10, a lock nut 62 (together forming a nut arrangement 60 for a bolt 12), and a driver (110, 500, 600, 700) used while installing the nut arrangement 60. Particularly, the bolt 12 is a rock bolt. The shear nut 10 comprises first and second portions (14, 18) connected by a connecting portion 22. The second portion 18 comprises an engaging formation 20 configured to interact with the bolt 12 to limit the extent to which the second portion 18 operatively advances axially along the bolt 12. The first portion 14 has an internal thread. In use, the first and second portions (14, 18) are configured to become separated at the connecting portion 22, when the engaging formation 20 interacts with the bolt 12 and a predetermined moment is applied to the first portion 14.

A shear nut for use with a bolt includes a first portion having an internal thread configured in a first directional orientation and configured to engage a first threaded portion of the bolt and comprising an external gripping formation configuring the first portion as a driving head, a second portion comprising an engaging formation configured, in use, to interact with the bolt so as to limit the extent to which the second portion operatively advances axially along the bolt, and a connecting portion connecting the first portion and the second portion.