Made from Grade 5 steel, these bolts are suitable for fastening most machinery and equipment. They have a smooth, low-profile head that provides a flush fit when installed. They're commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, but can also be used in leveling and work-holding applications. A square neck keeps these bolts from turning when tightening a nut. They are zinc yellow-chromate plated to resist corrosion in wet environments. Grade 5 steel bolts are marked with three radial lines. Length is measured from the top of the head.

Made from stainless steel, these chemical-resistant bolts have a square neck that keeps them from turning when tightening a nut. They're commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, because the smooth, low-profile head provides a flush fit when installed. Length is measured from the top of the head.

18-8 Stainless Steel—18-8 stainless steel bolts have good chemical resistance and may be mildly magnetic.

316 Stainless Steel—316 stainless steel bolts are more corrosion resistant than 18-8 stainless steel bolts. They have excellent resistance to chemicals and salt water.

Ribs under the head dig into the surface of soft metal and plastic to keep the bolt from turning when tightening a nut. These bolts are commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, because the smooth, low-profile head provides a flush fit when installed. Length is measured from the top of the head.

Black Oxide—Black-oxide steel bolts are mildly corrosion resistant in dry environments.

Zinc Plated—Zinc-plated steel bolts resist corrosion in wet environments.

Ribs under the head dig into the surface of soft metal and plastic to keep the bolt from turning when tightening a nut. These bolts are commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, because the smooth, low-profile head provides a flush fit when installed. 18-8 stainless steel bolts have good chemical resistance and may be mildly magnetic. Length is measured from the top of the head.

Sharp teeth bite into the surface of wood, rubber belting, and other soft materials to keep the bolt from turning when tightening a nut. These bolts are commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, because the smooth, low-profile head provides a flush fit when installed. Length is measured from the top of the head.

Zinc Plated—Zinc-plated steel bolts resist corrosion in wet environments.