Wood Screws
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Wood screws are sharp-pointed screws for nonstructural, wood-to-wood fastening. Wood screws have coarse threads and an unthreaded shank near the head, which allows the screw to pull the wood pieces tightly together.
Cement Board Screws
Cement board screws are fully threaded screws that secure backer board to wall studs or a subfloor for tile projects. They have a coating that resists corrosion from moisture and mortar. You can find cement board screws for wood, metal or both.
Drywall Screws
Drywall screws are fully threaded screws for interior projects, such as securing drywall to studs. Coarse-threaded screws are for hanging drywall on wood studs, while fine-threaded screws work with metal studs. Drywall screws don&#;t have the strength to support cement board and tile.
Deck Screws
Deck screws are designed for decks, fencing and other outdoor construction projects. Deck screws are either made of wood or a composite metal. Wood deck screws have a coarse-threaded portion and an unthreaded shank, like standard wood screws. Composite deck screws have finer threads and smaller heads. Some have a second set of threads to prevent the composite material from mounding at the screw head.
Lag Screws or Lag Bolts
Lag screws fasten heavy materials or components that handle large loads. Lag screws/bolts have hex heads, so they require a wrench or socket and ratchet to install. You may also see eye lag screws, which are simply wood screws with a ring at the head for securing rope or chain. They can&#;t carry the load a lag screw or bolt can.
Structural Wood Screws
Structural wood screws have a design, like wood screws, with coarse threads and an unthreaded shaft. However, they&#;re much stronger than basic wood screws. Depending on building codes, they can function like lag screws or bolts.
Machine Screws
Machine screws are fully threaded screws that secure metal components together.
Socket cap screws are machine screws that have a raised, cylindrical, hex-socket head.
Socket set screws are headless with an internal hex socket.
Sheet Metal Screws
Sheet metal screws are fully threaded screws designed to fasten sheet metal or sheet metal and softer materials. Some are designed for use with pre-drilled holes, and they&#;re also available with self-drilling points.
Concrete Screws
Concrete screws, also called concrete anchors, are designed for fastening in concrete or other masonry.
Multi-Material Screws
Multi-material screws have design features that allow use in several different types of work pieces, such as wood, sheet metal, drywall, masonry and plastic.
Our goal is to help simplify the buying process for this sometimes-complex category of fasteners by detailing the most critical things you must know when buying Set Screws.
1. What is a Set Screw?
A Set Screw is a fully threaded headless screw that is traditionally classified within the socket family of products. It is generally used to fasten an object within or against another object by exerting pressure rather than holding parts together with threads. It is normally used without a nut.
2. Who uses Set Screws?
Set Screws are used in many industrial and mechanical devices, particularly in assemblies with rotating items such as pulleys or wheels, where a component is locked onto a shaft. Designed to fasten one object inside another, Set Screws pass right through a threaded hole in the outer object and are tightened against the inner object. Pretty cool, right?
3. What materials and platings are available?
The most common Set Screw material options are alloy steel and stainless steel. Brass is a less popular and less available option.
The most commonly available material is hardened alloy steel with a thermal black oxide finish, as per ASME B18.3 and a Rockwell hardness of C45-53.
Stainless steel grades 18-8/303 and Metric A2 are also commonly available. Other exotic materials such as brass, 316 or A4 stainless steel, steel, 416, A286 or special finishes including zinc plating may be available for special order with a lead time.
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Socket Set Screws come standard with 3A thread fit. Some sizes and materials may be available with nylon patches or pellets.
Set screws with a slotted drive are made with a 2A thread fit.
4. What sizes are available?
In our experience, Set Screws are most commonly available in sizes 2-56 through 1&#; diameter in imperial and M2-M24 in metric diameters with a hex socket drive on one end and a cup point on the other.
5. What information should I provide to get an accurate quote?
The easiest way to order is by part number. The most popular manufacturers of Set Screws are Holo-Krome, Blue Devil and Misumi, along with the national catalog houses like McMaster-Carr, Grainger and MSC Industrial.
If you don&#;t have a part number, you&#;ll need to provide the diameter and thread, the body length, drive and tip type, material and plating.
6. Other than size, material and plating, what other options are available?
The other main considerations when selecting Set Screws are the drive and the point. We offer a comprehensive look at your options below.
Drives: The most common and readily available drive style is a hexagonal socket drive (think Allen wrench), however, Set Screws may also be available in slotted, six-lobe (Torx) and spline drives for certain sizes.
Points: This is where it gets interesting. The point of the Set Screw determines its function. Seven (yes, seven!) main points are available, each serving a slightly different purpose.
7. What other factors should I consider?
We&#;ve covered the most common variables including head style, diameter and thread, length, material and plating or finish. Does your project specify Inch (Imported or Domestic), Metric, OEM brand or Mil-Spec? Here are a few of the other considerations you might be faced with based on the project and the bill of materials:
We&#;ve covered the most common variables including head style, diameter and thread, length, material and plating or finish. Here are a few of the other considerations you might be faced with based on the project and the bill of materials:
Do you need domestic parts (i.e. Holo-Krome) or will imported screws work?
Do you require parts that conform to a specific mil-spec number, such as AN565, NAS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS,MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS, MS,MS, MS, MS, MS, MS with their exacting tolerances and traceability, or will standard commercial parts work?
Does your bill of materials call out a specific manufacturer, such as Holo-Krome or Blue Devil?
Make sure you have the correct installation hardware (Allen wrench or hex key) to go along with your Set Screws.
8. What level of certification is required?
Generally, a Certificate of Conformance or a COC is sufficient for your customer. Full certification with material certs, DFARS certification and test reports are often available for USA-made and mil-spec parts for a fee.
Here at MF Supply, we offer:
For more detailed information about Set Screws, to request a line card, or to send an RFQ, visit our website. And if you don&#;t see what you need listed, as always, ask us. &#;Finding the right screw for you&#; is our tag line after all!
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