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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   A cross-hole, "Weldon style" or "zero flute" countersink is a cone-shaped tool with a cutting edge provided by a hole that goes through the side of the cone. The intersection of the hole and cone form the cutting edge on the tool. The cone is not truly symmetrical as it is essential that the cone retreats away from the cutting edge as the tool ...

3. Gauge (firearms) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(firearms)

   Gauge (firearms) Not to be confused with caliber. The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) of the barrel. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm and ...

4. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   A counterbore in a metal plate. In machining, a counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level ...

5. Sheet metal - Wikipedia

   en.wikipedia.org/wiki/Sheet_metal

   In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge. Gauge differs between ferrous metals and nonferrous metals such as aluminum or copper. Copper ...

6. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   Type 304: The most common is type 304, also known as 18/8 and 18/10 for its composition of 18% chromium and 8% or 10% nickel, respectively. Type 316: The second most common austenitic stainless steel is type 316. The addition of 2% molybdenum provides greater resistance to acids and localized corrosion caused by chloride ions.

7. Parker Bros. - Wikipedia

   en.wikipedia.org/wiki/Parker_Bros.

   Parker guns were offered in 8, 10, 11, 12, 14, 16, 20, 28 and .410 gauges. There is an experimental example known to have been produced in 18 gauge. All else being equal, the smaller the gauge the more scarce and valuable a Parker gun would be in today's world.

8. Winchester Model 1897 - Wikipedia

   en.wikipedia.org/wiki/Winchester_Model_1897

   20 in (510 mm) Caliber. 12 gauge, 16 gauge. Action. Pump-action. Feed system. 5 or 6 round tubular magazine. The Winchester Model 1897, also known as the Model 97, M97, Riot Gun, or Trench Gun, is a pump-action shotgun with an external hammer and tube magazine manufactured by the Winchester Repeating Arms Company.

9. 16-inch/50-caliber Mark 7 gun - Wikipedia

   en.wikipedia.org/wiki/16-inch/50-caliber_Mark_7_gun

   The lightweight 16-in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long, 50 times their 16-inch (406 mm) bore diameter with barrels 66.7 ft (20.3 m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108 t) without the breech, and 267,900 lb (121.5 t) with the breech. [1]