A self-feed bit system includes a shank extending along an axis and configured to be coupled to a tool holder of a power tool and a cutting head couplable to the shank and including a sector shaped base. A radially extending lip is at a leading edge of the sector shape facing in a cutting direction and includes a rake face facing the cutting direction at a rake angle relative to the axis. A radially extending cutting blade is coupled to the radially extending lip and extends axially forward from the base at a first height. An at least partially threaded tip is coupled to the shank and extends axially forward of the cutting blade. Two or more teeth are positioned on a perimeter of the base trailing the cutting blade. Each tooth extends axially forward from the base at a second height that is less than the first height.

A method of repairing a chain can include aligning a bore of an outer chain link with a bore of an inner chain link, inserting a pin through the aligned bores, the pin having a thread end opposite a head end, engaging a multi-jackbolt tensioner with the thread end of the pin, the multi-jackbolt tensioner having a plurality of fasteners, advancing each of the plurality of fasteners to press on the outer chain link, and forming an interference fit between the pin and the outer chain link at the bore of the outer chain link from the advancing of the fasteners.

A hygienically sealable anchor bracket for installation of block style tube and pipe hangers to a ceiling, wall, floor, equipment frame, or other paneled strata in which there may be no access to the reverse side, there being a need to secure the anchor bracket to an attachment fastener or toggle bolt and simultaneously shield the exposed fastener or toggle bolt structure from the environment of the clean room, sterile room, or sanitary room in order to protect the irregular surface of the fastener or toggle bolt from caustic cleaning solutions and to prevent the buildup of dirt and bacteria, the anchor bracket having a pedestal in communication with the cavity which encapsulates the exposed portion of the toggle bolt and secures the anchor bracket thereto, the anchor bracket having a plurality of receptacles for receipt of fasteners utilized in assembling block style tube and pipe hangers, thus securing the block style tube and pipe hanger and anchor bracket to the ceiling, wall, floor, equipment frame, or other paneled strata.

The invention is directed to a toolless screw including a body portion which comprises a shaft portion and a screw portion which includes a shank portion and a tip portion. The shank portion includes at least two helical threads which extend off the shank either at different angles, different distances, or a combination thereof. The tip portion is positioned at an end of the shank portion and has a diameter which is less than the diameter of the shank portion and extends to a point. The body portion is integrated with a screw portion at the end of the shank portion which is opposite the end where the tip portion is positioned.

A semi-left-hand-thread-removal screw including a screw end head and a bolt, wherein a sink hole is provided on the screw end head, a lower portion of the sink hole is an inscribed polygon structure or an I-shaped structure, a thread which is opposite to the bolt is provided on an upper portion of the sink hole, the inscribed polygon structure is an inscribed hexagon. A screw according to aspects of the disclosure may be screwed in with a common inscribed hexagon screwdriver and an inscribed hexagon structure thereof which are embedded into each other; the screw can be unscrewed with a left-hand-thread screwdriver which is matched with a left-hand-thread structure thereof and screwed in the left-hand-thread structure thereof, after the left-hand-thread screwdriver is screwed in tightly, the screwdriver is continuously co-rotated and then the screw may be unscrewed.

A threaded fastener includes a bolt and a washer. The washer has a washer main body and a seal member provided at an outer peripheral side of the washer main body. The washer is caulked and fixed to a shank portion of the bolt in a water stop state, and the seal member is in contact with a fastened member in a water stop state, with a bearing surface of the washer main body held in contact with the fastened member. The seal member is provided on its outer periphery with a protrusion portion that protrudes outward beyond a radially outer end of a contact portion of the seal member with the washer in a no-load state. A back surface of the protrusion portion on the opposite side of the fastened member is an inclined surface.

A hygienically sealable anchor bracket for installation of block style tube and pipe hangers to a ceiling, wall, floor, equipment frame, or other paneled strata in which there may be no access to the reverse side, there being a need to secure the anchor bracket to an attachment fastener or toggle bolt and simultaneously shield the exposed fastener or toggle bolt structure from the environment of the clean room, sterile room, or sanitary room in order to protect the irregular surface of the fastener or toggle bolt from caustic cleaning solutions and to prevent the buildup of dirt and bacteria, the anchor bracket having a pedestal in communication with the cavity which encapsulates the exposed portion of the toggle bolt and secures the anchor bracket thereto, the anchor bracket having a plurality of receptacles for receipt of fasteners utilized in assembling block style tube and pipe hangers, thus securing the block style tube and pipe hanger and anchor bracket to the ceiling, wall, floor, equipment frame, or other paneled strata.

A semi-left-hand-thread-removal screw including a screw end head and a bolt, wherein a sink hole is provided on the screw end head, a lower portion of the sink hole is an inscribed polygon structure or an I-shaped structure, a thread which is opposite to the bolt is provided on an upper portion of the sink hole, the inscribed polygon structure is an inscribed hexagon. A screw according to aspects of the disclosure may be screwed in with a common inscribed hexagon screwdriver and an inscribed hexagon structure thereof which are embedded into each other; the screw can be unscrewed with a left-hand-thread screwdriver which is matched with a left-hand-thread structure thereof and screwed in the left-hand-thread structure thereof, after the left-hand-thread screwdriver is screwed in tightly, the screwdriver is continuously co-rotated and then the screw may be unscrewed.

(in connection with FIG. 1) The invention relates to a ballistic protective helmet (10) comprising a shell (21) comprising a shell material that is produced from a number of textile layers (11, 12) connected in a connection matrix. The shell (21) of the protective helmet (10) according to the invention has a blind hole (22), wherein a threaded sleeve (23) has an outer thread (25) that penetrates into the shell material which surrounds the blind hole (22) in a peripheral direction, and wherein the threaded sleeve (23) has an inner thread (26) for connecting to a screwing means (24) having an outer thread (31).