Abstract: A sleeve-component extracting jig according to the present invention is configured to include an engagement part on which a thread engageable with an inner circumferential surface of a sleeve component is formed, wherein a taper surface configured by cutting off crests of the thread to lower a height of the thread toward a leading end of the engagement part, and a plurality of clearance grooves open at the leading end of the engagement part and arranged at equal angular intervals in a circumferential direction of the engagement part are formed in the engagement part, a length of a radius of the engagement part at an end position of the taper surface is a sum of a length obtained by multiplying a thickness of the sleeve component by a digging ratio (20%˜60%) and a length of an inside radius of the inner circumferential surface of the sleeve component.

Abstract: A tap and chaser are provided each having a cylindrical tool receiver connected to a threading section by a shaft. The receiver and shaft are of diameters sufficiently small to enter the bore hole and distribute any off axis load onto a number of internal threads of the bore hole to dissipate loading. The threaded section includes a group of longitudinal flutes. Each of the lands of the threaded section includes a novel cutting face, tooth angle and rake angle to advantageously allow for threading deep blind holes.

Abstract: A metal anchoring fastener fastens millwork onto walls constructed with wall cladding fastened to steel studs. The load typical of a loaded cabinet is borne by the steel stud anchors owing to the mate between the profile of the steel stud anchor and the layers of millwork and wall cladding and steel stud that said anchor penetrates. The pitch of the thread adorning the profile of the steel stud anchor progresses non-linearly along the length of said shaft, the shaft is generally non-linear in profile, and the thread profile is non-uniform along the length of said shaft. The anchor can also support a secondary screw concentrically penetrating the void at the center of the anchor, in order to hang loads from a wall, with or without millwork. Predrilling of the holes can enable installation of these zinc anchors.

Abstract: A reamer has a basic tool body made of hard metal (12) and a plate-like cutting insert (18) inserted into a recess (28) at the front. The cutting insert (18) is at least partially made of polycrystalline diamond, its cutting edges (20) situated axially offset relative to the cutting edges (30) on the basic tool body (12), thus engaging with the workpiece later.

Abstract: A tool for machining a wall of a workpiece, made from a composite material, that can cut a groove in the wall, the tool including a head mounted integrally with a rod having a longitudinal axis and capable of being driven in rotation about the longitudinal axis. The head includes at least one main protruding annular rib with an outer surface covered with abrasive grains of predetermined particle size and with a radial height corresponding to the depth of the groove to be cut, and at least one auxiliary protruding annular rib with an outer surface covered with abrasive grains of predetermined particle size and with a radial height less than the radial height of a main rib. The auxiliary rib includes two circular ridges separated by a ring band that is flat and that can be conical in shape.

Abstract: A threaded fastener for securing a first material to a support comprising a tapping point at a first end and a threaded shank with multiple separate leads. An end diameter of a fastener tip is in the range of 0.210 to 0.190 inches, the tapping point starts away from an end of the tip by a range of 0.320 to 0.40 inches, and the threads are arranged on the shank to provide a range of about 16½ to 17½ threads per inch for a 5/16 inch diameter fastener and about 18½ to 19½ threads per inch for a ¼ inch diameter fastener. A second portion of the shank, distal from the tap screw point, is unthreaded, and a head at an end opposite the tap screw point has an enlarged diameter and a countersunk shape to reduce the likelihood of pull through of the fastener through said first material.

Abstract: A rock drill has at least one hard material insert (2) with at least two cutting edges (3, 7) consisting of hard material and extending radially to the drill axis (A), whereby, in a radial range of 20% to 50% of their drilling radius, at least two cutting edges (3, 7) each have an axial recess (4), and the cutting edges (3, 7) rotating around the drill axis (A) extend with their cutting edges in their entirety without any gaps over the entire drilling radius.

Abstract: Chaser for cutting threads on a work piece, the chaser having thread cutting formations with crests and roots, one flank of each of said formations being relieved at a first angle from the region of the crest toward the root and being relieved at a greater angle in the region adjacent the root of the formation. The chasers may be provided in sets with odd numbered chasers being mirror images of the even numbered chasers.

Abstract: An internally threaded fastener, such as a nut, includes a body having an axially extending opening with a side wall. A coarse internal thread convolution is formed in the side wall of the nut body. A fine thread convolution is also formed in the side wall of the nut body. The turns of the coincident coarse and fine thread convolutions are intermingled to enable them to engage a fastener having either a coarse or a fine external thread. An improved tap has a first section for forming the fine thread convolution and a second section for forming the coarse thread convolution. The two sections of the tap are interconnected in a coaxial relationship by a connector section having an axial extent which is less than the axial extent of the coincident coarse and fine thread convolutions. When a plurality of nuts are to be tapped, the fine thread convolution is tapped first.

Abstract: A male screw thread-formed member such as an insert having a thread cutting action has an exterior peripheral portion of substantially full V-thread form along which two or more angularly spaced apart flutes extend from one or both ends of the member, the member being provided with at least one non-helical rib initially of generally annular peripheral V-form at one or both ends thereof and on which is formed a varying reduced V-thread form which follows a helix corresponding to that of the full thread form whereby pointed cutting formations providing peaks of different radial heights and with some of them of offset disposition relative to the helix are formed on the or each rib at the flutes for effecting a distributed thread cutting action thereat, e.g., for use in thermo-setting plastic material.