Also called hex head cap screws, these fasteners have a six-sided head with a wide underside to spread loads evenly across surfaces.
Steel provides strength for everyday fastening applications. These screws are magnetic.
Stainless steel has a naturally corrosion-resistant surface that continues to protect the material from environmental contaminants even if scratched. It may be magnetic.
Lightweight, corrosion-resistant nylon is commonly used in electronics applications because it is nonmagnetic and nonconductive. It may absorb moisture, causing dimensional changes.
Recognizable by its bright yellow color, brass is a relatively soft, corrosion-resistant material that is nonmagnetic.
Bronze is a corrosion-resistant, nonmagnetic metal that conducts heat and electricity.
At roughly 1/3 the weight of steel, aluminum is a strong, corrosion-resistant metal commonly used for its lightweight properties. It is nonmagnetic.
The washer-like flange under the hex head spreads out the fastening force.
A silicone rubber O-ring sits in a groove below the screw head and presses against surfaces when installed to create a leak-resistant seal against air, lubricants, and other liquids and gases.