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A coiled spring pin, also known as a spiral pin, is a self retaining engineered fastener manufactured by roll forming metal strip into a spiral cross section of 2 + 1 ⁄ 4 coils. Coiled spring pins have a body diameter larger than the recommended hole diameter and chamfers on both ends to facilitate starting the pin into the hole. The spring ...
The Frey mechanism uses a steel ball and an out-of-flat end for the intermediate pin to force the intermediate pin to cock at reset. This means the intermediate spring doesn't need a special end, but the high stresses at the contact with the steel ball can lead to brinelling of the intermediate pin end or the top of the punch by the ball.
Sear shown in a revolver action. In a firearm, the sear is the part of the trigger mechanism that holds the hammer, striker, or bolt back until the correct amount of pressure has been applied to the trigger, at which point the hammer, striker, or bolt is released to discharge the weapon.
A firing pin or striker is a part of the firing mechanism of a firearm that impacts the primer in the base of a cartridge and causes it to fire. In firearms terminology, a striker is a particular type of firing pin where a compressed spring acts directly on the firing pin to provide the impact force rather than it being struck by a hammer.
Artist's conception of tuna trolling operation, using outriggers to tow multiple trolling lines and give the appearance of schooling fish. Trolling is a method of fishing where one or more fishing lines, baited with lures or bait fish, are drawn through the water at a consistent, low speed.
Location, location, location. There’s both an art and science to picking ideal hole locations for the four days of the U.S. Open, and those discussions begin years before the event. “It’s a ...
The safety notch is a relief cut made in the tumbler at the base of the hammer, that allows the sear to catch and hold the hammer a short distance from the pin or cartridge primer, in a "half-cocked" position. The safety notch works first by allowing the handler to retract the hammer a short distance from the firing pin or primer, such that ...
A latch or catch (called sneck in Northern England and Scotland) is a type of mechanical fastener that joins two or more objects or surfaces while allowing for their regular separation. A latch typically engages another piece of hardware on the other mounting surface.