The invention relates to a securing pin (16) which, in order to secure two chain connector shackles (12, 14) of a chain connector (10) against becoming disengaged, can be inserted into an opening (28) formed by the two chain connector shackles (12, 14), comprising a base body (30) with a through-hole (32), at least one spring ring (34), at least two balls (36), and a securing member (38) inserted into the through-hole (32), wherein an annular groove (54) in which the spring ring is inserted (34) is provided in a lateral surface (59) of the base body (30), wherein the annular groove (54) is provided with two bore holes (66) which are aligned with the through-hole (32) and in which the balls (36) rest, and wherein the spring ring (34) has at least one leg (64) which extends in the longitudinal direction of the base body (30) and which bends out of shape if the securing pin (16) is inserted into the opening (28) incorrectly. The invention further relates to a chain connector (10) for connecting two chains formed from links and to a method for connecting two chains by means of a chain connector (10) and for securing the chain connector shackles (12, 14) of the chain connector (10) against becoming disengaged by means of a securing pin (16).

A high-strength screw (2) includes a threaded portion (7) having a thread (8). The screw (2) includes an inner core (16) as seen in cross-section of the screw (2), the core (16) having a first hardness. The screw (2) includes an outer surface layer (17) as seen in cross-section of the screw (2). The screw (2) includes an unhardening layer (18) forming the outer surface layer (17) in the threaded portion (7), the unhardening layer (18) having a second hardness being reduced compared to the first hardness of the core (16).

A high-strength screw (2) includes a threaded portion (7) having a thread (8). The screw (2) includes an inner core (16) as seen in cross-section of the screw (2), the core (16) having a first hardness. The screw (2) includes an outer surface layer (17) as seen in cross-section of the screw (2). The screw (2) includes an unhardening layer (18) forming the outer surface layer (17) in the threaded portion (7), the unhardening layer (18) having a second hardness being reduced compared to the first hardness of the core (16).

A process for manufacturing products made of composite materials, is disclosed which includes the steps: screwing at least one insert provided with a threaded hole on the outer thread of at least one pin partially inserted in a removable manner in a mold; arranging on the mold one or more fiber layers provided with at least one opening in which the insert is arranged; curing resin with the layers arranged on the mold, so as to obtain a product made of a composite material which incorporates the insert and the layers; and rotating the pin in the insert for removing it from the mold. The present invention also relates to a mold, devices and a kit which can be employed for carrying out said process, as well as to products manufactured with this process and/or these means.

A process for manufacturing products made of composite materials, is disclosed which includes the steps: screwing at least one insert provided with a threaded hole on the outer thread of at least one pin partially inserted in a removable manner in a mold; arranging on the mold one or more fiber layers provided with at least one opening in which the insert is arranged; curing resin with the layers arranged on the mold, so as to obtain a product made of a composite material which incorporates the insert and the layers; and rotating the pin in the insert for removing it from the mold. The present invention also relates to a mold, devices and a kit which can be employed for carrying out said process, as well as to products manufactured with this process and/or these means.

A blowout preventer comprising: a main body comprising a seal seating profile, one or more bonnet guideways, and one or more slide guideways; a bonnet attached to the main body, wherein the bonnet comprises one or more guide rods, a ram unit, and a seal seating profile; two retention units attached to the main body and the bonnet, wherein each retention unit comprise a clamp block, one or more guide rods, and a bonnet guideway; and a metal seal, wherein the metal seal is seated in the seal seating profile of the main body and the seal seating profile of the bonnet.

A clamping device having a cylinder and a screw. The screw is configured to be fastened into the cylinder such that the screw may be tightened, removed and reused. The device may also include a loop associated with the cylinder that wraps around the item to be clamped and is insertable into the cylinder.

A clamping device having a cylinder and a screw. The screw is configured to be fastened into the cylinder such that the screw may be tightened, removed and reused. The device may also include a loop associated with the cylinder that wraps around the item to be clamped and is insertable into the cylinder.

A fluid end having its fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits, each kit comprising a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

A break-off bolt for securing a conductor within a connector includes a first thread section, a second thread section and a torque-limiting section arranged between the first thread section and the second thread section. The first thread section and the second thread section comprise the same external thread having a minor diameter. The torque-limiting section has at least one of no thread with an outer diameter larger than the minor diameter of the external thread or an external thread having a minor diameter larger than the minor diameter of the external thread of the first and second thread sections.