The invention relates to a method for screwing a locking ring (1) onto a threaded bolt (2), wherein a coupling device (6) for being threaded into the threaded bolt (2) is driven in rotation by a rotary drive (4), and wherein the locking ring (1) is then screwed onto the threaded bolt (2), which is fixed by the coupling device (6), by a locking ring holder (3) which is driven in rotation by the rotary drive (4). The invention likewise relates to a method for screwing a locking ring (1) comprising a fastening part (18a) and a tear-off part (18b) onto a threaded bolt (2), wherein a removal gripper (22) grips the tear-off part (18b) and removes the tear-off part (18b) after the tear-off part (18b) has been torn off. The invention further relates to a screwing apparatus for executing a method according to the invention.

A shear coupling can be used with reciprocating and rotary pumps. The shear coupling uses a shear nut and connecting member as the shear element. The connecting member and shear nut are located inside the axial bore of the shear coupling to protect from corrosive wellbore elements. The coupling members may be connected by matching polygonal shaft and hub profiles on the coupling members to transmit torque. The shaft and hub may have octagonal profiles for better torque transmission capacity. The shear nut may be isolated from large alternating stresses due to pretensioning of the connecting member. The length of the connecting member, especially when pretensioned, and a reduced cross-section that may be formed on the outer surface of the shear coupling increase the overall flexibility of the shear coupling, thereby increasing the resistance to bending stress.

A fastener includes a head, a shaft, and a pressure pad. The head has an outer surface for engaging a drive tool. The shaft has an outer surface including a threaded portion. The pressure pad has a breakaway portion with a torque limit connecting the pressure pad to the shaft.

A threading indicating bolt comprises a shank and a head, said head defining a trailing end and said shank defining a leading end of said bolt, said shank comprising a threaded trailing portion having a thread pitch, and a threaded leading portion, said threaded leading portion having a thread start, wherein said threaded leading portion extends in the axial length of said leading portion from said thread start to the threaded trailing portion for a length (L) being three times the thread pitch of said threads of said trailing portion; and wherein a torque is needed to thread a matching nut onto said bolt; said leading portion of said bolt comprising a mechanical threading indicating element adapted to increase said torque needed to thread a matching nut onto said bolt, while said matching nut is in threaded engagement with the mechanical threading indicating element arranged on said leading portion of said bolt; said increase of said torque being in comparison to a required run-down torque when said matching nut has been threaded onto said bolt past said leading portion and onto said threaded trailing portion. A threading indicating system and a method for assembling a bolted joint are also disclosed.

A device for torque limiting, has a nut having a female thread. A holding element includes a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool and a receiving part having a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated, the top part having a passage, through which a threaded rod screwed into the nut may be led out of the holding element through the top part along the longitudinal axis of the device. The holding element includes a web connecting the receiving part and the top part and which forms a predetermined breaking point. In at least one longitudinal sectional plane of the device, the smallest wall thickness of the at least one web is present on a line segment of minimum wall thickness, which runs at an angle greater than 45° with respect to the longitudinal axis of the device. A fastening arrangement includes the device.

The disclosure relates to a shearing screw for clamping an electrical conductor within a cable connector. The shearing screw comprises a screw body for engaging the cable connector, which further comprises an outer thread and a clamping surface for clamping the electrical conductor within the cable connector. The screw body also comprises a collar and a groove for detaching the collar from the screw body, whereas the shearing screw comprises a nut for shearing the shearing screw. The collar and the nut are adapted to be rotatable simultaneously with a sleeve for fastening the shearing screw to the cable connector.

The disclosure relates to a shearing screw for clamping an electrical conductor within a cable connector. The shearing screw comprises a screw body for engaging the cable connector, which further comprises an outer thread and a clamping surface for clamping the electrical conductor within the cable connector. The screw body also comprises a collar and a groove for detaching the collar from the screw body, whereas the shearing screw comprises a nut for shearing the shearing screw. The collar and the nut are adapted to be rotatable simultaneously with a sleeve for fastening the shearing screw to the cable connector.

An item for tightening including a first part including a first end part forming an end piece to engage with the head of a screw, and a second end part to engage with an actuating member, such that activation of the actuating member causes turning of the screw and the tightening, this first part being able to break into two portions upon reaching the recommended tightening torque, respectively a first portion including the first end part and a second portion including the second end part. A second part is mounted tightly about the first part, a holding device is provided in part on the first part and in part on the second part and being able to retain the second portion of the first part inside the second part of the item in order to prevent this second portion leaving this second part of the item after rupture of the first part.

A safety shear bolt includes a main bolt portion and a torque head portion connected to the main bolt portion. The torque head portion includes an extended head portion, a stem portion rigidly connecting the main bolt portion to the torque head portion, and a coupling mechanism rotatably connecting the extended head portion to the main bolt portion. The stem portion is configured to shear when a predetermined torque is applied to the extended head portion, while the coupling mechanism prevents the extended head portion from dropping after shearing off from the main bolt portion.

A foreign material exclusion plug is disclosed. The foreign material plug includes a cylindrical body, a slot, and a breakaway tab. The cylindrical body includes an externally-threaded cylindrical structure. The slot is formed in the cylindrical body extending into the cylindrical body from a top surface of the cylindrical body. The breakaway tab is connected to the cylindrical body and extends outwards from the top surface.