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The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
A tampion or tompion (in the Royal Navy) [1] is a wooden plug, or a metal, canvas, rubber, or plastic cover, for the muzzle of a gun, howitzer, or mortar. [2] Tampions can be found on both land-based artillery and naval guns. Naval tampions have been developed into works of art.
Typically, many rifles use thread diameters in the range between 25–27 mm (0.98–1.06 in). [ citation needed ] Many older rifles from the first half of the 20th century use a thread pitch around 2 mm (12.7 TPI), while many modern rifle use thread pitches around 1.5 mm (16.93 TPI).
Nominal (thread) sizes range from 0.1875 to 0.375 in (4.763 to 9.525 mm) and lengths from 1.25 to 5 in (32 to 127 mm). Typically an installer uses a hammer drill to make a pilot hole for each concrete screw and a powered impact driver to drive the screw. The drill hole should be 1/2" longer than the depth penetration of the screw.
Benelli manufactures the MR1 with three different barrel lengths: 12.5 inches, 16 inches, and 20 inches. The 12.5-inch barrel is threaded and features a removable muzzle brake. The MR1's stock section is modular and can be changed between: standard hunting rifle stock; Comfortech hunting rifle stock; [3] pistol grip with fixed stock;
The screw-in insert nuts come in various sizes and take different screw sizes. For example, an M6 insert nut will take an M6 bolt, a "1/4-20" insert nut will take a 1/4-20 inch bolt., etc The pre-drilled hole must be as deep as the length of the insert nut plus any portion of the bolt that may be screwed past the end of the nut in the work piece.
U.S. Army soldiers in UCP ACUs training with their M4 carbines fitted with bright yellow blank-firing adapters.. A blank-firing adapter or blank-firing attachment (BFA), [1] sometimes called a blank adapter or blank attachment, is a device used in conjunction with blank ammunition for safety reasons, functional reasons or a combination of them both.
Figure 1 of the original patent for the molly bolt, U.S. Patent No. 2,018,251. The molly bolt was patented in 1934 by George Frederick Croessant. [3] Although his patent acknowledges that expandable fasteners of this general kind were already known, Croessant's patent is intended to provide "an improved and adequate anchoring grip that may be retightened if necessary and that will permit ...