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Shoulder Screws, also known as Shoulder Bolts, are used for several different applications, including those that involve rotation or require a locking type of screw. Shoulder Screws are distinct from other types of screws due to the fact that they are only partially threaded, leaving a smooth-sided round or square shaft between the threading and the head. This shaft is usually slightly larger than the threaded portion of the screw. Often used in automotive and mechanical applications.
Stainless steels are used for their corrosion resistance, high-temperature strength, scaling resistance, and low-temperature toughness. These properties account for their extremely wide use in practically every industry. Martensitic Stainless Steels are stronger, but less corrosion resistant than the more common Austenitic Stainless Steels (e.g. 303, 304, 316). Martensitic Stainless Steels are alloys of iron and carbon that contain between 12% and 14% Chromium, up to 1% carbon, along with Nickel, Molybdenum, and other alloying elements. The chromium, which helps develop a passive surface oxide film, provides corrosion resistance in stainless steels.
Stainless Steel 416 contains 0.15% carbon, along with traces of sulfur which makes this alloy easier to machine than Stainless Steel 304 or 316 (for example). Tensile Strength is 40000 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. Fine threads are preferable when working with harder materials or when threading into a thin material. They are also stronger in tension than coarse threads, and generally provide higher shear strengths.
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