FASTENER SUPERSTORE
FASTENER GUIDE
Nut Types
Nuts are among the most expansive categories of hardware. Options run the gamut, with coupling, locking, flanged, hex, square, and more. Use our nut guide below to help identify the parts you need.
Acorn Nuts
Acorn Nuts
Acorn nuts, also known as Cap Nuts, are most commonly sold in a low crown, closed end style. They are typically used for decorative purposes or to protect projecting threads. Open-End nuts can be used with screws of any length.
Material / Finish Options:
Steel / Nickel
Steel / Black Oxide
Steel / Black Zinc
Diecast Zinc Alloy
18-8 Stainless Steel
316 Stainless Steel (Metric Only)
Castle Nuts
Castle Nuts
Castle Nuts feature a cylindrical top with slots cut into it, allowing for the insertion of a cotter pin to secure the nut in place.
Material / Finish Options:
Steel / Zinc
Grade 5 / Zinc
Clinch Nuts
Clinch Nuts
Clinch Nuts are designed for use in thin sheet metal. They provide a threaded hole after installation, making them great for materials that are too thin for thread tapping.
Material / Finish Options:
Steel / Zinc
303 Stainless Steel
Coupling Nuts
Coupling Nuts
Used to join two externally threaded pieces together, Coupling Nuts are available in a variety of lengths and outer diameters.
Material / Finish Options:
Steel / Zinc
Grade 5 / Zinc
18-8 Stainless Steel
316 Stainless Steel (Metric Only)
Finished Hex Nuts
Finished Hex Nuts
Finished Hex Nuts are perhaps the most common style of nut. Featuring a higher profile than machine screw nuts, they are generally used with low carbon cap screws and bolts.
Material / Finish Options:
Steel / Zinc
Steel / Plain
Steel / Black Oxide
Steel / Black Zinc
Steel / Zinc Yellow
Steel / Hot Dip Galvanized
Class 6 / Zinc
Class 8 / Zinc
Class 10 / Zinc
Grade 5 / Zinc
Grade 5 / Plain
Grade 5 / Black Oxide
Grade 5 / Hot Dip Galvanized
Grade 8 / Plain
Grade 8 / Zinc Yellow
Grade 9 / Eco Guard
18-8 Stainless Steel
316 Stainless Steel
Heavy Hex Nuts
Heavy Hex Nuts
Heavy Hex Nuts are thicker and wider across the flats than standard nuts, and provide longer thread engagement and a larger wrenching surface.
Material / Finish Options:
Steel / Zinc
Steel / Plain
Steel / Hot Dip Galvanized
Steel / Black Oxide
Grade 5 / Zinc
18-8 Stainless Steel
Hex Jam Nuts
Hex Jam Nuts
Hex Jam Nuts are two-thirds the size of a standard nut. They provide a lower profile when clearance area is a concern.
Material / Finish Options:
Steel / Zinc
Steel / Plain
Steel / Hot Dip Galvanized
Steel / Black Oxide
Grade 5 / Zinc
18-8 Stainless Steel
Left Hand Nuts
Left Hand Nuts
Left Hand Nuts are very similar to finished hex nuts, except for the left-handed threading.
Offered in Steel / Zinc.
Machine Screw Nuts
Machine Screw Nuts
Designed for use with machine screws, machine screw nuts are thinner than finished hex nuts. They are also available in small pattern and square styles.
Material / Finish Options:
Steel / Zinc
Steel / Plain
Steel / Black Oxide
Steel / Black Zinc
Steel / Zinc Yellow
Steel / Zinc Green
Steel / Nickel
18-8 Stainless Steel
18-8 Stainless Steel / Black Oxide
316 Stainless Steel
Nylon Hex Nuts
Nylon Hex Nuts
Nylon Hex Nuts offer resistance to grease and oils, and maintain their strength when exposed to heat.
Available in natural white nylon.
Panel Nuts
Panel Nuts
Panel Nuts are commonly used in switch mounts, volume controls & electrical fixtures. They offer options in thickness and width across the flats.
Material / Finish Options:
Steel / Zinc
Die Cast Zinc Alloy
Rivet Nuts
Rivet Nuts
Rivet Nuts, also known as threaded inserts, are one-piece internally threaded fasteners that are anchored from just one side of a workpiece or application.
Material / Finish Options:
Steel / Zinc Yellow
Aluminum
303 Stainless Steel
Slotted Hex Nuts
Slotted Hex Nuts
Slotted Hex Nuts feature slots cut into the end opposite of the bearing surface. They are secured with the insertion of a cotter pin.
Available in Steel / Plain or Steel / Zinc.
Square Nuts
Square Nuts
Square Nuts are designed for use with square bolts and offer a wider wrenching surface than hex nuts.
Material / Finish Options:
Steel / Zinc
Steel / Plain
Steel / Hot Dip Galvanized
18-8 Stainless Steel
Structural Nuts
Structural Nuts
Structural Nuts are used with structural bolts and offer a greater length of thread engagement. Galvanized structural nuts are typically supplied with a colored lubricant coating.
Material / Finish Options:
A194 Grade 2H / Plain
A563 Grade DH / Plain
A563 Grade DH / Hot Dip Galvanized
Tee Nuts
Tee Nuts
Tee Nuts, also known as T-Nuts are internally threaded barrels which accept screws or bolts to attach items to a surface when inserted into the back end.
Material / Finish Options:
Steel / Zinc
Steel / Black Zinc
18-8 Stainless Steel
Weld Nuts
Weld Nuts
Weld Nuts are designed specifically to be welded with another object. There are various types for different applications: single projection, multi projection, no projections with center hole or offset hole designs. Round and hex-base weld nuts are also available.
Material / Finish Options:
Steel / Plain
18-8 Stainless Steel
316 Stainless Steel
Wing Nuts
Wing Nuts
Wing Nuts are great for applications that require frequent assembly and disassembly. They offer hand turning in applications where greater torque is not required. They are available in Stamped, Cold Forged, and Washer Base styles.
Material / Finish Options:
Steel / Zinc
Steel / Black Oxide
Zinc Alloy (Washer Base style only)
18-8 Stainless Steel (Cold Forged only)
316 Stainless Steel (Metric only)
Rack Mounting Nuts
Rack Mounting Nuts
Rack Mounting Nuts include the 4 types linked below.
Cage Nuts
Cage Nuts
Cage Nuts allow for convenient mounting of your server rack equipment. A cage nut houses a standard nut in a cage with a spring. The cage has two wings that can be pinched to allow the cage nut to be inserted into a square hole.
Available in Steel / Zinc.
Also available with a screw and washer.
Clip Nuts
Clip Nuts
Clip Nuts are another style of rack mounting nut. Allows for convenient mounting of server rack equipment.
Available in Steel / Zinc.
Also available with a screw and washer.
Locknuts
Locknuts
Locknuts include the 7 types linked below.
Conduit Locknuts
Conduit Locknuts
Conduit Locknuts offer minimal surface area and protruding outer lobes to allow for easy turning. They are commonly used in the electrical industry.
Available in Steel / Zinc.
Flex Locknuts
Flex Locknuts
Flex Locknuts feature a slotted round collar at the back end that expands as the inserted bolt threads through it, creating prevailing torque locking action. They are available in thin height and full height.
Material / Finish Options:
Steel / Cadmium
18-8 Stainless Steel
Hex Flange Locknuts
Hex Flange Locknuts
Hex Flange Locknuts are hex nuts with a wide flanged portion near one end that acts as an integrated non-spinning washer. Many sizes feature a serrated bearing surface.
Material / Finish Options:
Steel / Zinc
Steel / Black Oxide
Steel / Black Zinc
Steel / Zinc Yellow
Grade 5 / Zinc
Grade 5 / Zinc Yellow
Grade 8 / Zinc Yellow
Grade 8 / Black Phosphate
18-8 Stainless Steel
316 Stainless Steel
Metric Material / Finish Options:
Grade 5 / Zinc
Grade 5 / Plain
Grade 5 / Black Oxide
Grade 5 / Hot Dip Galvanized
Grade 8 / Plain
Grade 8 / Zinc Yellow
Grade 9 / Eco Guard
18-8 Stainless Steel
316 Stainless Steel
Hex Keps Nuts
Hex Keps Nuts
Hex Keps Nuts, also known as K Lock Nuts, are pre-assembled with an attached free spinning external tooth lockwasher or conical washer. They provide locking action as the washer turns and digs into the bearing surface.
Material / Finish Options:
Steel / Zinc
Steel / Black Oxide
Steel / Black Zinc
Steel / Zinc Yellow
Steel / Zinc Green
Steel / Nickel
18-8 Stainless Steel
18-8 Stainless Steel / Black Oxide
Nylon Insert Locknuts
Nylon Insert Locknuts
Nylon Insert Locknuts, also known as stop nuts, feature a nylon-filled collar at the back end which restricts movement once a threaded fastener is installed. They are available in standard, thin, heavy, high, flanged, and domed styles.
Material / Finish Options:
Steel / Zinc
Steel / Black Oxide
Steel / Black Zinc
Steel / Zinc Yellow
Grade 5 / Zinc
Grade 8 / Zinc Yellow
Class 8 / Zinc (Metric Only)
18-8 Stainless Steel
18-8 Stainless Steel / Black Oxide
316 Stainless Steel
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Stover Locknuts
Stover Locknuts
Featuring controlled distortion of its top threads, stover locknuts can withstand high temperatures and severe vibration. They are often used in automotive applications and can be paired with flanged bolts.
Material / Finish Options:
Grade B / Cadmium
Grade C / Cadmium
Grade G / Black Phosphate
Two-Way Locknuts
Two-Way Reversible Locknuts
Two-Way Reversible Locknuts feature a round or rectangular indentation on the outer hex which slightly distort the center threads. They allow for a locking action even without full engagement of the mating screw.
Material / Finish Options:
Steel / Zinc
Steel / Black Oxide
Steel / Black Zinc
18-8 Stainless Steel
Tinnerman Style Nuts
Tinnerman Parts
Fastener SuperStore offers seven styles of tinnerman parts:
Cage Nuts
Available in Steel / Zinc or Stainless Steel
Clip Nuts
Available in Steel / Zinc
Flat Type Spring Nuts
Available in Steel / Black Phos or Stainless Steel
J Type Spring Nuts
Available in Steel / Black Phos
U Type Spring Nuts
Available in Steel / Black Phos
U Type Speed Clips
Available in Steel / Zinc or Steel / Black Phos
Hat Style / Axle Cap / Push On Nuts
Available in Steel / Zinc