Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment.

No need to carefully line up these screws before installing—they thread in smoothly even when they’re offset up to 15°. Their pilot point guides them into a hole, and transition threads straighten them as you tighten. They’re commonly called MAThread screws.

Made to Japanese Industrial Standards, these Class 8.8 steel screws are good for fastening most machinery and equipment.

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in medium-strength fastening applications.

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

Choose these screws for their adherence to strict military standards for material and construction. Their high tensile strength means they can be used in demanding, high-stress applications.

About half as strong as medium-strength steel screws, these screws can be used for light duty fastening applications, such as securing access panels.

Choose these metric screws for heavy duty stamping applications as well as earth-moving machinery, such as bulldozers and excavators. These screws are 10% stronger than our high-strength metric steel screws.

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

With the strength of steel and the corrosion resistance of 18-8 stainless steel, these 17-4 PH stainless steel screws are suitable for high-strength fastening in corrosive environments.

Choose these screws for their excellent corrosion resistance—comparable to 316 stainless steel—and the strength of steel. Use them for high-strength fastening in chemical and marine applications.

Aluminum screws are one-third the weight of steel and have good corrosion resistance.

Made from plastic, these screws are chemical and oil resistant, nonconductive, and lightweight.

More corrosion resistant than 316 stainless steel, nickel alloy screws have excellent resistance to salt water and some acids.

Ceramic screws won't melt, rust, seize, or become brittle—even at extreme temperatures. They are nonconductive and highly resistant to corrosive gases.

When a wrench won’t fit, turn these screws with a slotted screwdriver instead. Made from plastic, they’re chemical and oil resistant, nonconductive, and lightweight.

Made of Grade B7 steel, these screws are nearly twice as strong as Grade B8 and Grade B8M stainless steel screws. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193.

The most commonly used heavy hex head screw, these medium-strength steel screws are strong enough to join I-beams and scaffolding. They meet ASTM A325 and ASTM F3125 standards for structural applications.

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Made to Japanese Industrial Standards, these Class 10.9 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer.

Twice as strong as low-strength steel screws, these Class 8.8 steel screws can be used to fasten most machinery and equipment. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

When there’s not enough room to turn these screws with a wrench, slip a screwdriver into their slotted drive. They’re about half as strong as medium-strength steel screws—use them for light duty fastening applications, such as securing access panels. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Comparable in strength to Grade 9 screws, these are about 20% stronger than high-strength steel screws and often used in heavy duty applications, such as stamping and earth-moving equipment. The flange eliminates the need for a washer.

For strength comparable to that of Grade 9 steel and the corrosion resistance of stainless steel, choose these screws. They are work-hardened for extreme strength. The flange eliminates the need for a separate washer.

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Made of brass, these screws are electrically conductive, nonmagnetic, and corrosion resistant. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Made of nylon, these screws are chemical and oil resistant, nonconductive, and lightweight. When a wrench won’t fit, turn them with a slotted screwdriver instead. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Made from Grade 8 steel, these screws are at least 25% stronger than medium-strength steel screws. They can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Serrations under the head grip the surface of your material to help resist vibration.

When there’s not enough room to turn these screws with a wrench, slip a screwdriver into their Phillips drive. About half as strong as medium-strength steel screws, they’re best for light duty fastening applications, such as securing access panels. Their flange is serrated to help prevent loosening from vibration.

No need to hunt for a lock washer or apply messy threadlocker—these screws have serrations under the flange and adhesive on the threads to permanently hold them in place.

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. A serrated flange provides mild vibration resistance.

These Grade 5 steel screws are over 70% stronger than our stainless steel wire-lockable hex head screws. Wire these screws together through the hole in the head to get more vibration resistance than any other screw.

Also known as Sems screws, these screws have a washer that’s permanently attached but rotates freely. The washer has sharp teeth around the outside edge that bite into the screw and the material it's installed on for vibration resistance. Twice as strong as low-strength steel screws, these Grade 5.1 screws are suitable for fastening most machinery and equipment.

Also known as Sems screws, these screws have a permanently attached but freely rotating tooth lock washer that bites into the mating surface for vibration resistance.

Also known as Sems screws, these screws have a permanently attached but freely rotating tooth lock washer that grips the screw and your material for vibration resistance. When a wrench won’t fit, turn these screws with a slotted screwdriver instead.

These Class 8.8 steel screws are suitable for fastening most machinery and equipment. They are over 50% stronger than stainless steel thread-locking screws. For vibration resistance, they have a thread locker bonded to the threads.

Keep compatible screws, nuts, and washers on hand to make a strong joint. Twice as strong as low-strength steel screws, these Class 8.8 steel screws can be used to fasten most machinery and equipment.