Abstract: A gage for measuring the external threads of a threaded body has a segment housing formed from a housing body. The housing body has a generally U-shaped cross section with a bottom extending between a pair of opposite, upright sidewalls so that a channel with a longitudinal axis is defined. First and second gage segments are configured to engage the threads of the threaded body when the threaded body is positioned between the first and second segments and the first and second segments are closed together. The first gage segment is fixed to the housing body, and the second gage segment is received within the channel of the housing body. The second gage segment moves linearly within the channel along the longitudinal axis to allow the first and second segments to be separated for insertion of the threaded body between the first and second segments. This also allows the first and second segments to be closed together for engagement with the threaded body.

Abstract: A device for measuring the wrenching height of hexagonal head fasteners has a height indicator having an indicator shaft which extends therefrom. The height indicator is actuable by reciprocal movement. A gaging element housing is coupled to the height indicator and has an interior bore with a longitudinal axis with indicator shaft extending into the interior bore. A gaging ring is fixed to gaging element housing and has a central opening of a size selected as a minimum diameter for receiving a hexagonal head of a fastener to be measured. At least three gaging pins are received within pin holes of the gaging ring. Thin gaging pins reciprocate within the pin holes between an inward and outward position. By positioning the gaging ring over a hexagonal head of the fastener being measured, the gaging pins will engage a washer surface so that they are forced inward, actuating the indicator shaft of the height indicator so that the wrenching height of the hexagonal head fastener is measured.

Abstract: An apparatus for measuring workpiece concentricity having a base, a concentricity spin fixture, a spring-biased shaft, a collet, a follower member, and a concentricity indicator. The concentricity spin fixture receives a collet which receives workpieces of varying shank diameters and drive profiles. A follower member designed to engage a specific workpiece drive profile is biased against the workpiece drive profile by the spring-biased shaft. A test operator measures concentricity by rotating the workpiece using the concentricity spin fixture and by measuring the movement of the follower member against the spring-biased shaft using the concentricity indicator. The apparatus is capable of measuring the concentricity of workpieces having a shank and a drive profile, such as screws, bolts, other fasteners, and punches.

Abstract: An improved gage for measuring the diameters of threaded members comprises a frame having two platforms extending therefrom, and a support member mounted to the frame for receiving threaded members to be measured. A gage member having a plunger is mounted to a first platform, a measuring shaft is mounted to a second platform, and a lever arm is pivotally mounted on a fulcrum member mounted to the frame. A first end of the lever arm is in contact with, but not physically attached to, an end of the measuring shaft. A second end of the lever arm is in contact with, but not physically attached to, an end of the plunger of the gage member. A mechanical relationship is defined between the plunger of the gage member, the measuring shaft, and the pivotally mounted lever arm that permits the gage member to directly measure the diameter of the threaded object.

Abstract: A gauging plate for measuring fastener dimensions includes a rotatable plate having a plurality of openings for measuring fastener dimensions. The plate is rotatable to permit alignment of openings with a measuring member to enable the measurement of dimensions of a wide variety of fasteners. The plate preferably includes at least one slot in the periphery to receive fasteners to have dimensions measured. In the plate at least some of the openings extend throughout the thickness of the plate. The plate includes rotational means to rotate the plate to a plurality of dimension measuring positions. At least one adjusting screw is provided extending through the plate. The adjusting screw is adjustable to selected distances above the plate to enable adjustments of tolerance limits of the dimensions to be measured.

Abstract: A thread rolling screw has a continuous helical set of threads formed on a body. The threads have a tip section, an intermediate section, and a final section. In the tip and intermediate sections, the diameters of the crests progressively increase. In the intermediate section, relieved areas are spaced apart around the crests of the threads. In the final section, the threads are continuous and circular and of constant diameter. The crest of the last intermediate thread is the same diameter as the crests of the final thread section.

Abstract: An internal thread gage has two gage fingers mounted perpendicular to a frame axis. Each gage finger has a semi-cylindrical surface cut with helical threads. The gage fingers will move together and expand apart to allow an internally threaded fastener to be inserted over them for measurement. One of the gage fingers will move perpendicular to the frame axis to assure that the threads on the gage fingers properly mesh with the internal threads of the fastener. The gage fingers have threads for forming functional diameter measurement, as well as a cone and vee for making pitch diameter measurement.

Abstract: A fastener dimension measuring machine is disclosed including a rotatable plate containing a series of openings in the plate of different sizes and diameters to allow insertion of a wide variety of different size and shaped fasteners. Flat head protrusion, outside diameters, head heights, lengths and tolerance compliance may be measured in the machine. A measuring member is located above the plate, and is movable vertically between a fastener measuring and a fastener insertion or removal position. The measuring member is manually movable laterally relative to the plate to the measuring position, and is electrically connected to a digital recording member, which records and displays the measurements made. A foot pedal is provided to activate recording of the data, which then may be printed out in a desired manner.

Abstract: A thread gaging device has three thread gage rollers mounted 120 degrees apart from each other. Two horizontal arms extend outward from the base. One of the rollers mounts to one arm and the other two rollers mount to the other arm. The two rollers on the one arm can slide horizontally relative to each other to select the positions. Also, the two rollers can be repositioned vertically relative to the other roller to a selected position. The front of the rollers is pivotal relative to the base. An indicator will measure the amount of pivotal movement to gage a threaded fastener inserted between the rollers.

Abstract: A device is shown for measuring the minor diameter of a screw thread. The device includes a frame and an adjustable indicator blade which moves in a vertical plane for engaging a thread root of a screw arranged on the frame transverse to the adjustable blade. A pair of laterally moveable blades are mounted on the frame oppositely to the adjustable blade for holding a screw therebetween. Each of the laterally moveable blades has a blade point which engages a thread root of the screw at spaced locations along the longitudinal axis of the screw. An indicator is provided for determining the relative distance between the adjustable blade and the blade points of the laterally moveable blades when a screw is held therebetween.

Abstract: A recess indicator is shown having an indicator shaft which is reciprocated to record characteristics of a recess to be measured. An adapter sleeve has one end which is joined to the indicator with the indicator shaft received within the interior thereof. A housing is provided which carries a gaging element with the gaging element extending from one end thereof and has a bushing which extends from the opposite end thereof. The bushing can be releasably joined to the adapter sleeve to allow for the interchange of different gaging elements.

Abstract: In accordance with the present invention an improved alignment assembly is provided wherein when a threaded fastener is the test specimen, the fastener is gripped by a collet made of two longitudinally split, threaded, and tapered pieces held together with a spring. As a load is applied to the specimen, the two collet pieces are locked together by the tapers, assuring thread alignment. The split collar also preferably has different threads per inch at each end of the collet pieces to adapt to different threads of different specimens. Split collars of different geometry are used to test thin, non-threaded specimens. In a preferred embodiment, a reversible washer in which a first face is used to hold the fastener in place and in alignment in a first test, is also used to test the elongation of the fastener in a separate test, through the use of a second tapered face.

Abstract: In accordance with the present invention, a low in weight, portable, mechanical property testing machine is provided in which no special testing machine foundation is required, and a standard power supply may be used. The applied load to test the specimen is applied by the action of a rod making a single stroke within a cylinder containing hydraulic fluid. The inside diameter of the cylinder is significantly greater than the diameter of the rod. The hydraulic fluid transmitted from the cylinder is substantially ripple free and applies an even load to the specimen being tested through a second fluid cylinder and piston acting therein. The use of valves, as used in the prior art may thus be avoided, thus achieving simplicity of operation. To absorb the shock created by the specimen breaking, a dash pot is provided out board of the second piston as a shock absorber.