Dome Nuts or Cap Nuts

The cap nut, also known as the acorn nut or dome nut, gets its name from its shape. The nut has a domed top to prevent contact with the external thread. Used for Aesthetics.

Castle Nuts

Used with cotter pins to prevent loosening, a castellated nut, also called a castle or slotted nut, is a nut with slots cut into the top. Used in low-torque applications such as holding a wheel bearing in place.

Coupling Nuts

A coupling nut is a threaded fastener used for joining two male threads, most commonly threaded rod. The outside of the fastener is a hex so it can be driven with a wrench.

Flange Serrated Nuts

A flange nut is a nut that has a wide flange at one end which acts as an integrated washer that does not move or spin. The serrated flange distributes the pressure of the nut over the part being secured and creates a locking action to prevent loosening.

Shear Nuts

Shear nuts are cone nuts with a hexagonal gripping point. They are designed with an intentional flaw to snap the hexagonal head off once the maximum torque is reached. Leaving behind a protective cone nut that cannot be easily removed.

Wing Nuts

Wing nuts are threaded nuts with wings on each side of the body allowing for manual turning and installation. Easy hand assembly and used when the nut needs to be removed often.


A clever yet simple method of inserting a captive threaded insert into sheet metal, round or square tubes and even extruded aluminium sections. Widely used by manufacturers of tubular furniture, electrical switchgear, refrigeration, airconditioning and metal cabinets.

Nylock Nuts

A nyloc nut is a kind of lock nut with a nylon collar insert that resists turning.

The plastic insert is placed at the end of the nut, with an inner diameter (ID) slightly smaller than the major diameter of the screw. The insert deforms over the threads of the screw, without having threads in turn cut into it. 

Cleveloc Nuts

Cleveloc Nuts are low cost, all metal self-locking nuts with excellent locking characteristics. The locking collar is an integral part of the nut, which is formed into a geometric ellipse and provides two locking elements of uniform shape and thread contour.

Half Lock Nuts

A hexagon nut, half the height of a normal nut, typically used for locking a normal nut. Also called a jam nut or thin nut. 

Spring Nuts / Channel Nuts

A spring nut has a spring on one side that slides inside a strut channel. Typically has a threaded hole in the middle used to attach fittings to the strut. The nuts have serrated grooves to aid in alignment with the channel. 

Caged Nut

Also called a captive or clip nut. It consists of a nut in a spring steel cages, which wraps around the nut. The cage has two wings that when compressed allow the cage to be inserted into the square holes.

Weld Nut

Specifically designed to be welded to another surface. Made with more material than a normal nut so that the nut's form is maintained after welding.

Stover Nut

Also known as crimp nuts and top lock nuts. The thread near the top of the nut are intentionally imperfect to add shock and vibration resistance. Often used on vehicles and machinery.

Helicoil Threaded Inserts

Helicoil inserts are precision formed screw thread coils worked into a diamond shape and wound into a spiral coil which is installed into helicoil tapped holes. They provide permanent conventional 60 degree internal screw threads. Helicoil inserts are larger in diameter prior to installation, during installation the inserting tool applies torque to the tang reducing the diameter of the leading coil permitting it to enter the tapped thread. Helicoil inserts are measured in installed length

Hex Nuts

Hex finish nuts are used for fastening to a hex cap screw, socket cap screw or bolt. The most common nuts, hex finish nuts are hex shaped with internal threads and driven with a wrench.

Square Nuts

A four sided nut that may be flat or beveled on top. Square nuts provide a greater surface contact area which provides more resistance to loosening. Typically mated with square head bolts.

Structural Heavy Hex Nuts

Structural hex nuts are comparable to finish nuts but are made to be thicker and much stronger. They are typically used in steel to steel structural connections.

T-Nuts / Furniture Nuts

A t-nut or tee nut is used to fasten wood, particle or composite board leaving a flush surface. A long thin body with a flange at one end resembles a T in profile. T-nuts often have 3 or 4 prongs that sink into the surface providing better retention.