Industrial Fasteners - Nuts and Bolts Suppliers – Thread Source

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Sheet Metal Screws

Sheet metal screws, a type of self-tapping screw, have threads down the entire length of the shank for tapping and fastening thin material. The point style determines the type of material the screw can be used on, such as metal, wood, or plastic. These screws commonly have a sharp point that helps penetrate the material.
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Machine Screws

Machine screws are meant to hold two metal work pieces together, with the use of a threaded pre-tapped hole, or through a hole and held with a nut. They are threaded the entire length of the shank. For most styles of a machine screw, the length is measured from under the head to the end of the screw. For flat head machine screws, since they are intended to fit into a countersunk hole, their length is measured from the top of the screw head to the end of the screw.
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Tek Self-Drilling Screws

Teks screws provide secure fastening to metal with strong holding power, without the need to pre-drill. High performance cutting tips are designed to quickly penetrate the metal surface for easy installation. Self-tapping threads ensure strong holding power, in either sheet metal or steel beams. There are even Teks screws for wood-to-metal applicaitons.
Standard grade Teks screws are ideal for attaching HVAC, electrical work, metal framing, and general light to medium applications. The TRAXX grades are designed for heavier applications, and are available in Stainless Steel and Hardened Steel.
There are also several types that include neoprene washers, to seal the drill site against rain or other water.
Please answer the following questions to find the exact Teks screw that you need.
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Hex Cap Screws, Grades 2

A hex cap screw is a six-sided bolt with a trimmed hex head and a washer face on the bearing surface. Informally, it is also called a Finished Hex Bolt. Hex cap screws have tighter tolerances than standard bolts of the same size, and so are often used where precise tolerances are needed. The standard hex screw specifications include ASTM A449 and SAE J429 Grade-2.
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Hex Cap Screws, Grades 5

A hex cap screw is a six-sided bolt with a trimmed hex head and a washer face on the bearing surface. Informally, it is also called a Finished Hex Bolt. Hex cap screws have tighter tolerances than standard bolts of the same size, and so are often used where precise tolerances are needed. The standard hex screw specifications include ASTM A449 and SAE J429 Grade-5.
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Hex Cap Screws, Grades 8

A hex cap screw is a six-sided bolt with a trimmed hex head and a washer face on the bearing surface. Informally, it is also called a Finished Hex Bolt. Hex cap screws have tighter tolerances than standard bolts of the same size, and so are often used where precise tolerances are needed. The standard hex screw specifications include ASTM A449 and SAE J429 Grade-8.
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Hex Tap Bolts

The major distinguishing feature of hex tap bolts is that they are always fully threaded from under the head to the tip, no matter the size. Other features, such as chamfered point or washer bearing surface under the head, may be present, or may not. Tap bolts are meant to be used nuts to secure two objects together, but they also will fully seat into a tapped hole to secure one material to a base material.
They are available in Grade 2, Grade 5, and in Stainless Steel.
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All Thread, Threaded Rod

Threaded rod has continuous threading, either on both ends or it may extend along the complete length of the rod. It has no head or fashioned tip. Threaded rod can be used as an anchor bolt, clamp, hanger or U-bolt.
Threaded rod is available in carbon steel, as Plain, Zinc Plated and HDG, as well as Stainless Steel and the B7/A193 alloy.
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Hex Nuts

Hex nuts in all their forms are widely used in construction and manufacturing. There are many different styles of hex nuts, including finished hex nuts, acorn nuts, lock nuts, and heavy hex nuts. They are available in many different grades of metal, with different finishes, and with coarse or fine threads. Choose from the options below to find the right hex nut for your project.

Note: The Coupling Nut – Reducing items use the Inch – Special option because they have two sizes of threads.
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Lag Screw, Hex Head

Manufactured to be extremely sturdy, lag screws are some of the toughest fasteners. They are used to attach objects to wood and anchor masonry. Common applications include retaining walls, deck frames, and wooden beam outdoor play equipment. For masonry application, use the screw in conjunction with a lag shield. Lag screws have coarse threads designed for pre-drilled holes to prevent splitting or snapping, and require minimal clearance above the fastener. The hexagonal drive allows for simple installation and controlled traction with a socket or wrench.

For corrosion resistance, lag screws are available as Zinc plated, Hot Dipped Galvanized (HDG), and Stainless Steel.
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Carriage Bolts

Carriage bolts have a smooth rounded head with a square neck underneath that locks into wood to prevent spinning when tightened. Use with a pre-drilled hole and secure with a hex nut and washer. They are great fasteners for decks, play equipment, docks, fencing, and furniture.
The unique design is great for connections where the head is not accessible for tightening. The self-locking square neck and coarse threads fasten very securely.
All carriage bolts we stock have coarse threading as a standard.
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DRYWALL SCREWS

Drywall screws fasten sheets of drywall (also called sheetrock or plasterboard) to the wall or ceiling support studs. Drywall screws with coarse threads are used to to attach to wood framing. Screws with fine threading are used for metal studs. Also, self-drilling versions are available for attaching to thicker metal support.
Most drywall screws have a tapered bugle head to penetrate the drywall without damaging the outer layer of paper. Trim head screws are used to attach trim pieces over the drywall, and have a very small head that disappears into the surface for easy finishing. K-lath screws have a large wafer head to easily attach wire mesh, or lath, to the frame studs to support plaster. Their low profile heads are easily covered over by the finished surface of tile, stone, brick, stucco, etc.