Nylon 6/6 Socket Cap Screw, Hex Socket Drive, #4-40, 5/8" Length (Pack of 100)
Socket Cap Screws are reliable and durable and are used in many applications.  They are available in a variety of head styles and materials.Nylon 6/6 is a general purpose thermoplastic with outstanding resistance to organic chemicals, acids and alkalis.  Nylon wears well against other surfaces; it is readily machinable and may be milled, turned and cut with conventional machine tools.  It does exhibit some dimensional swelling in wet applications which should be taken into account with its use.  Tensile strength of this material is 12,000 psi (pounds per square inch).With a high cylindrical head, socket cap head fasteners have a recessed driving area and offer high hold power at high torque levels.  Hex socket drive systems are driven by hex wrenches or power tools with hexagonal bits.A threaded fastener's size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine.  Coarse threads are better when working with brittle materials; they are sturdier and are easier to thread and unthread compared to fine.  Coarse threading also allows for thicker coatings and platings.