Monday, February 27, 2012

Stainless Steel Machine Screw, Pan Head, Phillips Drive, -, /" Length (Pack of )

Stainless Steel
Stainless Steel 316 Machine Screw, Pan Head, Phillips Drive, #4-40, 1/4" Length (Pack of 25)
by Small Parts
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Buy new: $6.69

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Choose 316 stainless steel machine screws when you need superior corrosion resistance to chemicals, solvents, and chlorides in a range of fastening applications including chemical-processing and marine environments.

Offering better corrosion resistance than both 302 and 304 stainless steels, 316 stainless steel contains molybdenum and higher amounts of chromium and nickel than other stainless steel alloys. These additional elements protect screws from pitting, a form of corrosion that creates holes in material. Austenitic Stainless Steels are alloys of iron and carbon that contain between 16% and 30% chromium, a maximum of 0.15% carbon, along with nickel or manganese, and other alloying elements. The chromium, which helps develop a passive surface oxide film, provides corrosion resistance in stainless steels. Austenitic Stainless Steels are designated by a 3 digit SAE Stainless Steel Grade beginning with the number 3 (e.g. 304, 316).

Pan head fasteners feature a lower profile than similar styles such as round and fillister heads but still protrude above fastened material for easy installation and removal. The cross-slotted Phillips drive style reduces risk of over-tightening. This design causes the driver to slip under too much force, protecting both the screw and the fastened material from damage. Screws are designed according to ANSI B18.6.3 standards, which specify dimensions including head diameter and height, slot width and depth, and driver size.

Machine screws, also referred to as machine bolts, often are used with nuts or driven into threaded holes in metal or composite materials. A threaded fastener's size includes information about the screw’s largest diameter, followed by the number of threads per inch, which indicates whether it is coarse (has fewer threads per inch) or fine (has more threads per inch). Coarse threading provides easier, faster assembly and is ideal for softer materials. Fine threading offers greater strength and works best with very hard materials or thin materials like sheet metal.

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