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Types of Fasteners

Types of Nuts and Bolts

Fasteners come in many different forms. To make it easy for you, we’ve compiled the data below as a guide for figuring out what each fastener is called. Screws are simply bolts that do not normally require pre-threaded connectors, such as nuts, to fasten to. Scroll down to learn about many different types of nuts, bolts and screws!


Bolts & Screws
Nuts Washers
Rivets
Concrete Anchors Inserts Threaded Rod Retaining Rings

Types of Bolts & Screws

carriage bolt

Carriage Bolts

Also known as a “coach” bolt, has a domed or countersunk head. The square section under the head grips into the part being fastened preventing the bolt from turning when the nut is tightened.
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Deck Screw

Deck Screws

Our deck screws feature a type 17 point (notched point at the tip) to aid in chip removal during thread cutting which allows for an easy installation in wood and composite deck materials. A bugle head and square drive help to eliminate the stripping effect sometimes experienced with other types of drives.
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hex bolt

Hex Head Bolts

Hex tap bolts, hex cap screws, trim head hex cap screws, and hex serrated flange bolts fall under this category. They share a hexagonal head and are driven with a wrench. Referred to as both bolts and screws.
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lag bolt

Hex Lag Screws

Lag screws, also called lag bolts, are large wood screws. The head is external hex and are driven with a wrench. Used for lag together lumber for framing, machinery to wood floors, and other heavy duty applications.
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machine screw

Machine Screws

A machine screw is a screw or bolt with a flat point. Available in a variety of drive types and heads, they fit a wide variety of applications. Often driven into tapped holes. Used with nuts and washers, also known as “stove bolts” or “stovers”.
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self drilling screw

Self-Drilling Screws

Self-drilling screws have a sheet metal thread with a self-driller cutting (TEK) point to pierce through 20 to 14 gauge metals. The higher the TEK number, the larger the drill point to pierce heavier gauge metals.
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sheet metal screws

Sheet Metal Screws

Sheet metal screws (SMS) have sharp cutting threads that cut into sheet metal, plastic or wood. They have a fully threaded shank and sometimes have a notched point at the tip to aid in chip removal during thread cutting.
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shoulder bolts

Shoulder Bolts

Shoulder bolts (also known as shoulder screws or stripper bolts) are machine screws with a shoulder between the thread of the screw and the head of the part. Once installed, the non-threaded portion extends out of the surface of the application site, allowing the bolts to act as dowels or shafts for moving parts. They can be installed by hand or with a socket (allen) driver.
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socket cap screw

Socket Cap Screws

Socket cap screws are available in button socket, button flange socket head, flat socket, and socket cap. Driven with a socket wrench or a hex allen key. The term socket head cap screw typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times or more than that of the screw shank diameter.
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socket set screw

Socket Set "Grub" Screws

Set screws are most often headless (aka blind), meaning that the screw is fully threaded and has no head. A blind set screw, known in UK as a grub screw, is almost always driven with an internal wrenching drive, such as a hex allen key. Socket set screws are installed in threaded holes or inserts.
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wood screw

Wood Screws

Wood screws are partially threaded with large cutting threads and a smooth shank. They are designed to slide through the top piece of wood and tightly pull all boards together.
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Fastener Varieties Menu

Types of Nuts

acorn nut

Cap Nuts

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

Castle Nuts

Used with cotter pins to prevent loosening, a castellated nut, also called a castle or slotted nut, is a not with slots cut into the top. Used in low-torque applications such as holding a wheel bearing in place.
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coupling nut

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.
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flange nut

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.
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finished nut

Hex Finish 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.
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jam nut

Hex Jam Nuts

A jam nut is often used when a nut needs to be locked in place without clamping to another object. Hex jam nuts are hex shaped with internal threads, but they are thinner than hex finish nuts.
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heavy hex nut

Heavy Hex Nuts

Larger, heavier, and thicker than a standard hex nut. Heavy hex nuts are hex shaped, internally threaded, and driven with a wrench. Often used with hex cap screws and carriage bolts.
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machine screw nut

Hex Machine Nuts

A machine nut is hex shaped with internal threads. Smaller than a hex jam or hex finish nut, they are used with machine screws under 1/4" diameter.
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machine nut

Hex Machine Nuts Small Pattern

A machine nut is hex shaped with internal threads. Smaller than a hex jam or hex finish nut, they are used with machine screws under 1/4" diameter.
View Machine Screw Nuts Small Pattern

keps nut

Keps-K Lock Nuts

Also known as a keps nut, a k-nut or a washer nut, a keps-k lock nut has an attached free spinning lock washer. Keps nuts are designed to make assembly more convenient.
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knurled thumb nut

Knurled Thumb Nuts

A knurled head thumb nut or thumb nut has a knurled outside surface rather than a hex, which facilitates tightening by hand. Often used in decorative finishes or applications.
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nylon jam nut

Nylon Hex Jam Nuts

A low profile lock nut is hex shaped, internally threaded with a nylon insert. The nylon material prevents loosening from vibration and cross threads to stop the nut from backing off of the fastener.
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nylon lock nut

Nylon Insert Lock Nuts

A nylon insert lock nut is hex shaped, internally threaded with a nylon insert. The nylon material prevents loosening from vibration and cross threads to stop the nut from backing off of the fastener.
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stover nut

Prevailing Torque Lock Nuts (Stover)

Commonly known as stover nuts, prevailing torque lock nuts have chamfered corners and a conical top. The distortion in the top threads resists loosening from vibration. Also called one-way nuts, they can only be installed one way and are often used in high temperature application because they are all metal with no nylon insert.
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square nut

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.
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tee nut

T-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.
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wing nut

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.
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Types of Washers


dock washer

Dock Washers

Dock washers are heavy duty washers, often used to build docks. Also used in heavy duty construction where a thick washer is needed, dock washers are similar to fender washers with a small inside diameter hole.
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fender washer

Fender Washers

Fender washers are round washers with a small inside diameter hole. Fender washers are used to prevent pull-through and provide a greater bearing surface under the fastener.
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thick fender washer

Fender Washers - Extra Thick

Fender washers are round washers with a small inside diameter hole. Extra thick fender washers are thicker than standard fender washers and are used to prevent pull-through and provide a greater bearing surface under the fastener.
View Extra Thick Fender Washers

finishing cup washer

Finishing Cup Washers

Finishing cup washers form a cup for the head of the screw or fastener to fit in, creating a finish flush with the top of the head. Used for finishing, cup washers are shaped like a cup.
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flat washer

Flat Washers

Flat washers are round outer diameter thin plates with a center hole punched to the size of the bolt or screw. Flat washers are used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened.
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thick flat washer

Flat Washers - Extra Thick

Extra thick flat washers thicker than standard flat washers. These washers are round outer diameter thin plates with a center hole punched to the size of the bolt or screw. Flat washers are used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened.
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military flat washer

Flat Washers - Military Standard

Military standard (MS) flat washers go through extensive inspection for chemical, physical and dimensional qualities. MS washers must meet specific inner diameter and outer diameter specifications.
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flat washer 900 series

Flat Washers - 900 Series

Flat washers in the 900 series are round and thinner than a standard flat washer with a smaller inside and outside diameter.
View 900 Series Flat Washers

lock washer

Lock Washers - Split Ring

Split ring lock washers are used to prevent nuts, bolts and screws from vibrating loose. These washers are rings which are split at one point and bent into a helical shape.
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thick lock washer

Lock Washers - High Collar

High collar lock washers are designed to fit under the head of a socket cap screw. Split ring lock washers are used to prevent nuts, bolts and screws from vibrating loose. These washers are rings which are split at one point and bent into a helical shape.
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external tooth lock washer

Lock Washers - External Tooth

External tooth lock washers are used for locking and tension. Round washers with teeth on the outside, used for maximum holding power. Must be used with fasteners with adequate head diameter.
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internal tooth lock washer

Lock Washers - Internal Tooth

Internal tooth lock washers are used for locking and tension. A round washer with internal teeth, designed to prevent a nut or screw head from loosening with the strut action created by the teeth.
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NAS washer

NAS Washers

NAS washers are round washers with a smaller inner and outer diameter. Often used in military applications because of the strict measurement specifications.
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neoprene washer

Neoprene EPDM Washers

Round washers that are slightly beveled with a neoprene lining. Often used with sharp point and self-drilling TEK screws to make a watertight seal around the screw or metal roofing or siding.
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square washer

Square Washers

Square washers are square in shape and may be flat on both sides or flat on one side and beveled on one side. Often used with square head bolts, square washers prevent pull through and provide a larger surface area and greater hold than standard round flat washers.
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Fastener Varieties Menu


Types of Rivets

Rivet

POP Rivets (Open End)

POP Rivets, also known as blind rivets, are used to connect two pieces of material in quick, efficient way. POP Rivets are tubular, comprised of a hat and mandrel; the length of the mandrel is snapped off when installed.
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Closed End Rivet

Closed End POP Rivets (Sealed)

Closed End Rivets differ from a standard blind pop rivet in that they feature a closed end which creates a watertight seal.
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large flange rivet

Large Flange POP Rivets

Large flange, also called Oversize, pop rivets have a larger washer on the hat than standard POP Rivets. Also known as blind rivets, they are used to connect two pieces of material in quick, efficient way. Large flange POP Rivets are tubular, comprised of a hat and mandrel; the length of the mandrel is snapped off when installed.
View Large Flange POP Rivets

countersunk rivet

Countersunk POP Rivets

Countersunk, also call Flat, POP Rivets, are used to connect two pieces of material in quick, efficient way. The hat of the rivet is almost inverted, with a 120 degree countersink in the integrated washer. POP Rivets are tubular, comprised of a hat and mandrel; the length of the mandrel is snapped off when installed.
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Types of Concrete Anchors

masonry screwmasonry anchor

Masonry Screws

Concrete masonry anchors, also known as Tapcons, cut threads into concrete, brick or block when installed. Extended corrosion protection is gained from the blue climaseal coating. No hole spotting or inserts required.
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sleeve anchor

Sleeve Anchors

Concrete masonry sleeve anchors consist of a threaded stud with an outwardly flared cone-shaped end, with a nut and a washer on the end. Tightening of the nut pulls the stud end into the expander sleeve, wedging it outwards and locking the anchor into the base material. Made for hollow concrete applications (ex. cinderblocks).
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wedge anchor

Wedge Anchors

Concrete masonry wedge anchors are used to anchor and secure material and equipment to solid concrete masonry surfaces (ex. concrete slabs). Comprised of an anchor, a nut and a washer. Used to fasten concrete to equipment, materials, generators, motors, pumps, pipe, strut, plastics and wood.
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Inserts

Dowel Pins

Dowel Pins

Dowel pins are manufactured on pneumatic dowel equipment and come in pre-cut lengths and diameters. They are cylindrical with slightly beveled ends. Used in many applications and industries such as aerospace, joint reinforcement, shelf support, furniture building, and hobbyists use them to build toys and models.
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helicoil insert

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.
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threaded insert for metal

E-Z Lok Threaded Inserts

Unlike helicoil inserts which require a special drill, E-Z Lok threaded inserts for metal are installed using standard tools. Drill the appropriate sized hole with a standard drill, tap the hole with the matching size tap and turn the insert to install. Stainless Steel Threaded Inserts are used for metal applications, and Brass Threaded Inserts are used for wood and soft material applications.
View E-Z Lok Threaded Inserts Stainless Steel
View E-Z Lok Threaded Inserts Brass


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Threaded Rod


Threaded Rod

A threaded rod is threaded with no head, available in many grades and materials. Often referred to as redi-rod, fully threaded rod and ATR, threaded rod is used for fastening anything from an anchor bolt, to suspending electrical or plumbing equipment from a ceiling. Often used in drop ceiling application.
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Retaining Rings

bowed E retaining ring

Bowed-E Retaining Rings

External Bowed E radially assembled Rotor Clips or retaining rings are designed to be installed into a groove on a shaft. Once snapped into a groove, these clips exert a force or –preload on retained parts, in order to compensate for accumulated tolerances. Externally bowed are radially installed.
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E-style retaining Ring

E-Style Retaining Rings

External E Radially assembled Rotor Clips or retaining rings are the most popular and widely used style of radial retaining ring. They are called “e” rings because of the three prongs on the inside of the shaft which make contact with the bottom of a groove on a shaft to create a shoulder for effective assembly retention.
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External Retaining Ring

External Shaft Retaining Rings

Axially installed External Rotor Clips or retaining rings are designed to be installed into a groove or shaft. Once installed in a groove on a shaft, a portion of these retaining rings protrude from the groove in order to create a shoulder to keep an assembly.
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Internal Retaining Ring

Internal Housing Retaining Rings

Axially installed Internal Rotor Clips or retaining rings are designed to be installed into a groove on a shaft. Once installed in a bore or housing, a portion of these retaining rings protrude from the groove in order to create a shoulder to keep an assembly.
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