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The 20- gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States. [ 3][ 4] The 20-gauge is popular among upland game hunters ...
Framing side by side units. The erection of a wooden frame in Sabah, Malaysia. Framing, in construction, is the fitting together of pieces to give a structure support and shape. [ 1] Framing materials are usually wood, engineered wood, or structural steel. The alternative to framed construction is generally called mass wall construction, where ...
A screw thread is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine ...
Light-gauge (25-gauge or lighter) provides better sound isolation than 16-20-gauge steel, and noticeably better performance than wood studs. [21] When heavy gauge steel or wood studs are spaced 16" on center, additional resonances form which further lower the sound isolation performance of a partition.
Shotgun cartridge. A 12-gauge shotgun cartridge in a transparent plastic hull, allowing the contents to be seen. From left to right: brass, propellant, over-powder wad, shot wad, #8 birdshot, over-shot wad, and crimp. A shotgun cartridge, shotshell, or shell is a type of rimmed, cylindrical (straight-walled) ammunition used specifically in ...
Unified Thread Standard. The Unified Thread Standard ( UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries.
Specs: 3-Shot, Takedown, 20 gauge only (2 3/4-inch), 2 shell detachable magazine. Weight 6 1/4 lbs, barrel, 26" with variable C-Lect-Choke with ventilated barrel. Genuine American Walnut Monte Carlo one piece pistol grip stock with recoil pad. Model 185K: Made in 1950 only. Model 185K-A: Made 1950 to 1955.
Steel frame. Rectangular steel frame, or "perimeter frame" of the Willis building (at right) contrasted against the diagrid frame at 30 St Mary Axe (at center), in London. Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams, constructed in a rectangular grid to support the floors, roof ...