A torque retaining device for preventing unitary rotation of a nut and a fastener extending through two parts to be connected is provided. The torque retaining device includes an engagement portion for connection to one of the nut and a fastener head and an elongated portion for rotationally catching on one of the parts that the fastener is to be extended through. The engagement portion includes a wall having an inner side that defines a cavity for placement of the fastener head or nut and is shaped rotate with the fastener head or nut. At least one flexible member extends radially inwardly from the inner side of the wall for holding the fastener head or nut in the engagement portion.

A screw bit body which allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the bracing surface. Additionally, the engagement cavity traverses into the screw bit body from the first base to the second base. The engagement cavity is specifically positioned offset from the first lateral edge by a first distance.

Provided is a tightening device capable of easily capturing a change in a contact state of a member to be tightened such as a bolt or the like and also reliably performing fastening. A tightening device (10) tightens a bolt (A) to a work piece (B) in a state where a main body (11) is engaged with the bolt (A), and includes: a magnet (11b) that holds the bolt (A) with respect to the main body (11); and lower cam members (15) that enable fixation in a fixed state where a binding force on the bolt (A) is larger than that in the held state by the magnet (11b). The lower cam member (15) is capable of maintaining the fixed state before the tightening work of tightening the bolt (A) to the work piece (B) is performed and releasing the fixed state after the tightening work is started.

A temporary tightening tool includes a grip part and a socket part into which a bolt head part is inserted. The socket part is formed in a shape of a hexagonal tube surrounded by six side walls, a hook part, which is a leaf spring part, is formed in each of alternate three side walls among the six side walls, and a thick torque transmission part is formed in each of three remaining side walls without the hook part. When the bolt head part is inserted in the socket part, the hook part is elastically deformed, and holds the hold bolt head part with restoring force. Torque input into the grip part is transmitted to the bolt head part from the torque transmission wall.

A screw clamping tool includes a main body and an elastic clamping member. The main body has a driving portion having a driving bore which rotates about a rotation center for driving a screw member. A plurality of contact faces are disposed on an inner side of the driving bore, and a positioning groove concavely is formed on the driving bore. The elastic clamping member is formed of a non-metal material and disposed in the positioning bore and protruding on an inner edge of the driving bore with respect to the contact faces. When the screw member is received in the driving bore, the elastic clamping member stably clamps the screw member.

A retention socket is configured to hold a non-ferrous metallic fastener and includes a socket body defining a cavity shaped to receive a head of the non-ferrous metallic fastener. The retention socket further includes a mechanical retaining feature coupled to the socket body to removably couple the non-ferrous metallic fastener to the socket body without the aid of magnetic forces.

A fastener extractor device for removing fasteners and disengaging the extractor from the so engaged fastener. The extractor includes a threaded main body with a hex drive head end portion and oppositely disposed elongated tool engagement hex body with multiple bracing sidewalls with independent contoured fastener engagement channels for fastener insertion and continued rotational removal. A tubular hex surface extractor nut is threadably disposed on the main body member for reversed thread rotation advancement to physically disengage the tool engagement body from the removed fastener.

An anti-slip torque tool that utilizes a plurality of grooves to prevent slippage and facilitate torque transfer to a fastener. The tool includes a wrench torque-tool body and an at least one engagement element. The wrench torque-tool body includes a plurality of internal sidewalls, a first base, and a second base. Further, each of the internal sidewalls includes a bracing surface. The engagement element includes a first pair of grooves and a second pair of grooves, wherein each further includes a primary cavity and a secondary cavity. The engagement element is laterally integrated into a specific sidewall to provide additional gripping action. The first pair of grooves and the second pair of grooves are positioned offset from each other, along the bracing surface of the specific sidewall. The primary cavity and the secondary cavity each traverse normal and into the bracing surface from the first base to the second base.

A driving tool is providing, including: a driving end including three ribs which are angularly arranged in intervals, each of the three ribs being formed as a part of a rectangle and including two right angles, every adjacent two of the three ribs defining a groove therebetween.

A grease fitting installation tool is disclosed. The grease fitting installation tool may include a hand tool useful for installing and uninstalling a grease fitting with a hexagonal collar, a threaded shank, and a nipple, i.e., a Zerk fitting. The hand tool may have a first tool head and a second tool head, each able to receive and manipulate a grease fitting. The first and second tool heads may be attached end to end, joining the heads in the center of a hand tool by a couple. The couple may have a wrench interface allowing the hand tool to be engaged by a wrench or other tool. Each tool head may include a hollow socket with a socket aperture and six internal contact surfaces that are hexagonally arranged. The tool head may also include a deformable, cylindrical gripping member disposed within the hollow socket for retaining the grease fitting when the grease fitting is inserted into the gripping member.