Choosing the correct fasteners for an application can be the difference between a project that stands strong for years to come and one that loosens and falls apart over time.
Professional remodelers and contractors know that the quality and longevity of their work has a lasting impression on their personal brand and business. In order to produce consistently excellent results and keep customer referrals coming in, then they need to make sure they have the highest quality supplies.
GRK fasteners have been trusted for over 25 years as the industry leader in this category. This guide outlines the uses and benefits of each type of unique fastener they manufacture.
Table of Contents:
Introduction: How it All Started
GRK began manufacturing “The Industry’s Toughest Screws” in 1990. Early on, the company worked tirelessly to build relationships with reputable wholesale partners and building material retailers internationally.
The business grew rapidly due, in large part, to the uniqueness of GRK’s products. Every GRK fastener features at least one proprietary patent, and the company is continuously designing and testing their products in an effort to innovate their already high-performing screws and fasteners.
One such innovation was the development of Climatek technology. Originally designed for the Navy to prevent corrosion at sea, Climatek is now used exclusively on GRK products to provide superior protection and longevity.
Today’s professional remodelers and contractors swear by GRK fasteners, such as the remodeling business owner who posted this review:
“We have been using GRK’s for the last year and they are a very strong fastener that is also quick to install.” - Thomas V.
GRK products have earned a reputation for durability and reliability. Each fastener is designed with a specific purpose in mind and engineered to master that application better than any other fastener on the market.
“I've used different types of wood fasteners before for my deck, but these ones are exceptional. Drive easily into the wood and don't break. The Torx head is a definite plus as it transfers the torque effectively and does not strip the head. I definitely will use again if needed.”
No matter the application, GRK fasteners can be trusted to get the job done quickly and securely.
GRK Caliburn Concrete Screws Concrete and masonry fasteners
GRK Caliburn Screws are used to securely attach materials and fixtures to concrete surfaces. Caliburn screws are made of high carbon steel and are Climatek coated to resist corrosion. Their patented thread design easily drives through concrete, and the screws are durable enough to be removed and reinserted multiple times without breaking or wearing. The diagram below shows the proper installation of Caliburn Screws.
“Good strength into concrete. Installed over 400 and had only one head snap off. I will use again without question!” - Gene M.
Caliburn Flathead Concrete Screws
Caliburn Flathead Concrete Screws feature a self-anchoring system that makes installation fast and easy. Their heavy duty threads are best suited for securely attaching wood to concrete. They are compatible with T-30 star drive drill bits and pre-drilling with a 3/16 bit is recommended.
Caliburn Panhead Concrete Screws
Caliburn Panhead Concrete Screws possess all of the great benefits of the original Caliburn flathead screws, but with the added appeal of the pan head which lends itself well for exposed finish looks. They are compatible with T-30 star drive drill bits and pre-drilling with a 3/16 bit is recommended.
Caliburn XL Concrete Screws
Caliburn XL is the third style of Caliburn fasteners and features a washer head style. Their design gives them superior holding power for applications such as basement framing. They are compatible with T-40 star drive drill bits and pre-drilling with a 1/4 bit is recommended.
GRK FIN/Trim Screws - Fine carpentry fasteners
GRK FIN/Trim Screws have the smallest screw head on the market and range in length from 1 ¼” to 5”. They work for both interior applications such as trims, crown molding, and cabinets as well as exterior projects such as deck rails, stairs, and banisters.
The patented Zip-Tip head design makes pre-drilling optional and its incredibly small size makes the head virtually disappear when countersunk. A pro-tip for using GRK FIN/Trim Screws is to drive at half-speed for a perfect finish every time. These screws are compatible with T-10 star drive drill bits and pre-drilling is not necessary.
PHEINOX Stainless Steel Screws
PHEINOX Screws are made from the highest quality 305-grade stainless steel wire, which maximizes their torque and strength. The patented Climatek coating of these screws makes them ideal for use around pools, decks, and hot tubs.
In addition to excellent rust resistance, they are also a great choice for use in highly acidic woods such as redwood and cedar. Just as with all FIN/Trim Screws, PHEINOX Stainless Steel Screws should be driven at half-speed. They are compatible with T-10 star drive drill bits and pre-drilling is not necessary.
White FIN/Trim Screws
GRK FIN/Trim Screws are available in a white Climatek finish to seamlessly match your project’s overall finish. These screws are particularly useful for door and window trims, crown moldings, and cabinets. They are compatible with T-10 star drive drill bits and pre-drilling is not necessary.
GRK Low Profile Cabinet Screws Cabinet and vinyl siding fasteners
GRK Low Profile Cabinet Screws are primarily used for cabinet construction and installation since they are adept at preventing splitting. However, they are also recommended for the installation of vinyl siding due to their small diameter and drawing power.
Low Profile Cabinet Screws are strong enough to provide a strong and secure installation but are thin enough at 4mm to prevent your materials from splitting in the process. They feature a built-in washer head that presses flat and seamlessly blends into any surface. Their W-Cut threads reduce torque and their self-tapping design eliminates the need for pre-drilling. They are compatible with T-15 star drive drill bits.
Cabinet Stainless Steel Screws
PHEINOX Cabinet Screws are only available in #8 x 1 ¼”, whereas the other GRK Low Profile Screws are available in a wider variety of sizes. These screws harness the strength and durability of stainless steel for cabinetry applications and maximize torque and provide unmatched overall performance.
As with all PHEINOX screws, PHEINOX Cabinet Screws are best suited for wet environments such as exterior projects around decks, pools, and hot tubs. For cabinet applications, these screws are highly resistant to corrosion which makes them perfect for highly acidic substrates including redwood and cedar. They are compatible with T-15 star drive drill bits and pre-drilling is not necessary.
White Low Profile Cabinet Screws
GRK Low Profile Cabinet Screws are available in a white Climatek finish which is perfect for blending into the surface of your project. Low Profile Cabinet Screws can also be used to light duty framing applications where the white finish also comes in handy for a clean and smooth result. They are compatible with T-15 star drive drill bits and pre-drilling is not necessary.
GRK R4 Multi-Purpose Framing Screws Highly versatile fasteners
GRK R4 Multi-Purpose Framing Screws work effectively in numerous materials including wood, particle board, laminate decking, melamine, cement fiberboard, and even sheet metal. They are even useful in projects that use pressure treated lumber.
R4 Screws don’t require pre-drilling and are still able to prevent splitting for precise, clean holes. GRK elaborates on the unique properties of R4 Screws in their US Distributor Catalog, stating:
“GRK's R4™ self-countersinking screw has a patented underhead with saw-blade like cutting teeth and six self-contained cutting pockets. Together they act similar to a circular saw-blade, transporting the drill dust away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment.”
“These GRK fasteners are amazing! They'll save you a ton of time and you won't have to worry about wood splitting when screwing in on an edge as these fasteners boar their own hole. US Tool & Fastener co. is great. They were very helpful when I called with questions about my product and I received my order within 1 day.”
Since GRK R4 Screws are used for such a wide variety of projects, they are available in many different sizes and pack sizes. The #6 and #8 sizes are compatible with T-15 star drive drill bits, while the #9, #10, and #12 sizes are compatible with T-25 star drive drill bits.
GRK R4 Multi-Purpose Framing Screws:
- #6 x 1 ¼” | #6 x 1 ½”
- #8 x 1 ¾” | #8 x 2” | #8 x 2 ½”
- #9 x 1 ¼” | #9 x 1 ½” | #9 x 1 ¾” | #9 x 2” | #9 x 2 ½” | #9 x 2 ¾” | #9 x 3 ⅛”
- #10 x 1 ½” | #10 x 2” | #10 x 2 ½” | #10 x 2 ¾” | #10 x 3 ⅛” | #10 x 3 ½” | #10 x 4” | #10 x 4 ¾”
- #12 x 4 ¾” | #12 x 5 ⅝” | #12 x 6 ⅜” | #12 x 8” | #12 x 10” | #12 x 12”
PHEINOX R4 Stainless Steel Screws
As with the other R4 Screws, PHEINOX R4 Screws are self-countersinking, which allows them to cut a perfectly clean hole that leaves no damaged dust or fibers around the head. This technology also makes drilling into hardwoods like oak and birch faster and easier since they can be installed without separately countersinking. PHEINOX R4 Screws are compatible with T-25 star drive drill bits.
GRK MSS Metal Siding Screws Ultra corrosion resistant fasteners
GRK MSS Screws, as seen in GRK's US Distribution Catalog, provide exceptional resistance to corrosion and maximum strength attachment security. Metal Siding Screws feature an integrated washer head that is complemented by a rubber washer below. This allows MSS Screws to completely seal off drill holes, making them a great option for exterior projects that face exposure to the sun, precipitation, and other elements.
MSS Screws can be used for interior and exterior applications, but they are most commonly used for projects like metal siding installation and garage door trims. They are compatible with T-25 star drive drill bits and pre-drilling is not necessary.
GRK RSS Structural Screws Hardened steel structural fasteners, Lag screw alternatives
GRK RSS Screws are used for structural applications including ledger boards, carrying beams, deck posts, stair rails, and other interior and exterior structures. RSS Screws are the preferred alternative to traditional lag screws for professional remodelers because the CEE thread enlarge the screw holes in order to reduce splitting.
Other benefits of RSS Screws over conventional lag screws are their washer head type that does not have sharp edges and their nominal diameter helps center them in pre-drilled hardware such as hinges.
“1. Love GRK's. They make construction so much easier when their use is appropriate. 2. USTF has the biggest range of their products, many I cannot get locally 3. Purchasing from them was easy and quick, I'll keep shopping here.”
“I recently used GRK RSS screws in lieu of using lag bolts to stabilize the guard railing and baluster panels of a deck. Installation was easy and fast and the RSS screws tightened the railings beautifully!”
RSS #10 and ¼” are compatible with T-25 star drive drill bits; 5/16” and ⅜” are compatible with T-30 star drive drill bits; ⅜” are compatible with T-40 star drive drill bits. No pre-drilling is required for faster penetration.
GRK RSS Structural Screws:
PHEINOX RSS Stainless Steel Screws
PHEINOX RSS Screws are so corrosive resistant and high performing that GRK offers a lifetime guarantee against staining and rusting. They are created from hardened steel for optimum strength and durability, and their corrosion resistance makes them a great option for projects in coastal areas and below ground.
RSS JTS Joint & Truss Screws
GRK JTS Screws are incredibly heavy duty fasteners for roof and floor construction. They are also frequently used in projects such as ledger boards, retaining walls, and log and timber framing. The threads of these screws are very sharp, allowing them to instantly cut into materials - even hardwood - without splitting.
GRK RT Composite Trim Screws Composite, PVC, and fine carpentry
GRK RT Composite Trim Screws are essentially FIN/Trim screws but with reverse threading under the head. It’s that threading that allows the screws to work well in composite and cellular PVC trim. GRK describes the benefits of this unique design feature as such:
“Based on extensive tests, GRK has found that the reverse thread helps the screw head disappear beneath the surface of the classic wood composite material, reducing or eliminating the dimple that sometimes appears when using the FIN/Trim™ screw.”
“These screws are small-headed and bury themselves easily into composite boards. Using the GRK bits gives me the most life for installing. Good products!”
RT Composite Trim Screws’ heads disappear when countersunk, leaving a smooth finish at the end of your project. The #8 sizes are compatible with T-10 star drive drill bits, and the #9 sizes are compatible with T-15 star drive drill bits. As with the original FIN/Trim Screws, no pre-drilling is necessary.
PHEINOX RT Stainless Steel
All RT Screws, including PHEINOX RT, are approved for use with pressure treated lumber. PHEINOX RT Screws #8 varieties are compatible with T-10 star drive drill bits, and the #9 sizes are compatible with T-15 star drive drill bits. The #8 x 2” and #8 x 2 ½” are also available with whiteheads.
RT White Composite Screws
RT White Composite Screws blend in seamlessly with white decking and other materials. They are made with case hardened steel for maximum attachment strength and are approved for use in pressure treated lumber.
GRK Top Star Shim Screws Shim-free installation
GRK Top Star Adjustable Shim Screws eliminate the need for shims when installing wooden doors and windows. Their unique design features a screw within a screw that makes for easy adjustments with minimal labor. They are white zinc plated for exceptional longevity and can be adjusted quickly even years after the initial installation.
After pre-drilling with a 5/16” bit, Top Star Adjustable Shim Screws are installed using a Top Star Crown Bit for completely plumb installation. They are also compatible with T-15 star drive drill bits.
Conclusion: Find Fasteners Fast With USTF
Our highly skilled experts are available to answer your questions about GRK or any fasteners. We pride ourselves on providing quick, knowledgeable responses in addition to our fast, free shipping.
“Best fasteners that I have used in over 40 years of building barns, decks, sheds, etc. The shipping from USTF was next day and free. You can't get any better service than that.”
Another satisfied pro commented:
“Could not get GRK SS screws locally in the length I needed so I tried UST&F. The process was simple, fast and effective. Screws arrived when I needed them and the new dock is not completed. Would recommend UST&F in the future.”
Contact us online or call 877-777-4717 today.