PTFE Machine Screw, Flat Head, Slotted Drive, #4-40, 3/4" Length (Pack of 5)

PTFE Machine Screw, Flat Head, Slotted Drive, #4-40, 3/4" Length (Pack of 5) Reviews

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PTFE Machine Screw, Flat Head, Slotted Drive, #4-40, 3/4" Length (Pack of 5) Feature

• Machine Screws are often used with nuts or driven into tapped holes
• PTFE is suitable for high temperature environments and for applications that have the potential for surface wear and exposure to water and chemicals
• Flat head style allows fastener to sit flush to the surface
• Driven by a flat-bladed driver
• Coarse threads are better for brittle materials, and will assemble and disassemble more quickly than fine threads

Machine Screws, also referred to as Machine Bolts, are often used with nuts or driven into tapped holes. They come in a variety of head types and drive styles, but are generally available in smaller sizes.

PTFE (polytetrafluoroethylene) has similar properties to Teflon, including an extremely low coefficient of friction (it doesn't stick to other materials and it resists surface wear). PTFE also exhibits a useful service life from below -100 degrees Fahrenheit, to temperatures of over 500 degrees Fahrenheit. Its resistance to solvents is also excellent throughout a wide range of temperatures. PTFE has a high dielectric strength (600 volts/millimeter) which makes it a good insulator. PTFE is also very non-hydroscopic, or water resistant, absorbing less than 0.01% of its weight if exposed to water for a 24 hour period. PTFE has below average tensile strength, at 3000 psi (pounds per square inch).

Flat head fasteners are designed to fit flush to the surface when used with countersunk holes. Length is measured from the top of the head. Common applications for slotted screws include woodworking, although the drive style is not designed to be used with power drivers.

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.

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Detail Reviews

Sep 15, 2011 09:14:05