Wood Screw Standard Lengths,Eaa Workbench Plans,woodworking tools organization - .

Although nails are the most commonly used fastener, the use of staples to attach wood structural members is growing. Two-thirds of the length of the nail is driven into the other piece of wood for proper anchorage. The other one-third of the length provides the necessary anchorage of the piece being fastened.
Using screws, rather than nails, is more expensive in terms of time and money, but it is often necessary to meet requirements for superior results. The main advantages of screws are that they provide more holding power, can be easily tightened to draw the items being fastened securely together, are neater in appearance if properly driven, and can be withdrawn without damaging the material. The common wood screw is usually made of unhardened steel, stainless steel, aluminum, or brass.
Wood screws are threaded from a gimlet point for approximately two-thirds of the length of the screw and are provided with a slotted head designed to be driven by an inserted driver.

The most common types are flathead, oval head, and roundhead, as illustrated in that order in figure 3-79, All of these screws can have slotted or Phillips heads. They are longer and much heavier than the common wood screw and have coarser threads that extend from a cone, or gimlet point, slightly more than half the length of the screw. Square-head and hexagonal-head lag screws are always externally driven, usually by means of a wrench. They are used when ordinary wood screws would be too short or too light and spikes would not be strong enough.
These screws are made regularly in steel and brass with four types of heads: flat, round, oval, and fillister, as shown in that order in figure 3-79.
Bolts are selected for application to specific requirements in terms of length, diameter, threads, style of head, and type. The use of washers between the nut and a wood surface or between both the nut and the head and their opposing surfaces helps you avoid marring the surfaces and permits additional torque in tightening.

Selection of the proper machine bolt is made on the basis of head style, length, diameter, number of threads per inch, and coarseness of thread.
Prongs on the outside of the shield grip the wall surfaces to prevent the shield from turning as the anchor screw is being driven. As the screw is tightened, the shield spreads and flattens against the interior of the wall.

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