Best Flat Head Structural Screws for Decks and Timber Projects
Flat head structural screws sit flush with wood and can provide a low-profile finish for framing, decking, and outdoor timber projects. The best choice depends on the required length, quantity, drive size, and exposure to moisture. LIONMAX’s 2-7/8-inch screws are best for buyers who need longer fasteners; SG TZH’s 2-inch options suit shorter applications and come in two pack sizes. The #17 long screws are intended for substantial timber work, but their listed length deserves careful verification before ordering.
| Product | Listed size | Notable feature |
|---|---|---|
| LIONMAX, 50 count | #14 x 2-7/8 inches | T30 drive; black coating |
| SG TZH, 94 count | #14 x 2 inches | Four-layer coating; T30 bit |
| SG TZH, 40 count | #14 x 2 inches | Smaller pack; T30 bit |
| #17 timber screws, 25 count | #17 x 15.7 inches, as listed | T40 drive; green coating |
| LIONMAX, 100 count | #14 x 2-7/8 inches | Larger pack; T30 drive |
LIONMAX #14 x 2-7/8-Inch, 50 Count
These carbon-steel screws are a good fit for buyers who need a longer fastener than the 2-inch options in this list. The flat countersunk head is designed to sit flush with the wood surface, while the T30 star drive is intended to help reduce slipping and stripping during installation. A T30 bit is included.
The black coating is listed as having passed a 1,000-hour salt spray test, making this option relevant to outdoor projects exposed to moisture. Choose it for timber, deck, shed, or landscape work where the listed 2-7/8-inch length fits the assembly. The pack contains 50 screws. Limitation: The supplied information does not specify a load rating or approved structural connection details, so match the fastener to the project requirements.
SG TZH #14 x 2-Inch, 94 Count
Best for buyers who need #14 screws at a 2-inch length and prefer a larger pack. The product is described as carbon steel with heat treatment and a four-layer, rust-resistant epoxy coating. The coating is listed as passing a 1,000-hour salt spray test. A T30 star bit is included.
The flat head supports a flush finish, and the maker describes the drive as resistant to slipping. This pack is a practical choice when the project needs more screws than the 40-count version provides. Limitation: The 2-inch length may not suit thicker lumber or connections requiring greater penetration; confirm the required screw length for the specific assembly.
SG TZH #14 x 2-Inch, 40 Count
This is the smaller-pack version of the SG TZH 2-inch screw. It is best for buyers completing a limited repair or trying to match a project that calls for #14 x 2-inch fasteners without selecting the 94-count quantity. Listed features include carbon steel, heat treatment, a four-layer corrosion-resistant coating, and a T30 star bit.
The product description reports a 1,000-hour salt spray test and says the T30 drive is designed to resist slipping. Its flat head is intended to sit flush in wood. Limitation: It shares the 2-inch length limitation of the larger pack, and the listed information does not provide a structural load capacity.
#17 Long Timber Screws, 25 Count
These screws are described for timber applications such as deck framing, fence posts, pole barns, landscape timbers, railroad ties, and retaining walls. Features include a flat head, T40 Torx drive, deep threads, sharp starting tips, and green coating with a stated 1,500-hour salt spray test. The listing recommends predrilling dense hardwood or when using extra-long screws.
Choose this option only after verifying the size: the product name gives the length as 15.7 inches, an unusually long dimension compared with the other products here. The listed package contains 25 screws. Limitation: Check the seller’s current specifications and confirm the actual length before purchase; do not assume this size is interchangeable with typical deck screws.
LIONMAX #14 x 2-7/8-Inch, 100 Count
This larger pack is best for buyers who need the same listed dimensions and features as the 50-count LIONMAX option but require more fasteners. The carbon-steel screws have a flat countersunk head and T30 star drive, and the listing says a T30 bit is included. The black coating is described as passing a 1,000-hour salt spray test.
Consider it for outdoor timber, landscape, or construction projects where #14 x 2-7/8-inch screws are appropriate. The product description also highlights resistance to bending or shearing, but does not provide a load rating. Limitation: The larger quantity is unnecessary for small jobs, and project-specific connection requirements still need to be checked.
Buying Guide: How To Choose Flat Head Structural Screws
What length and diameter do you need?
Start with the lumber thickness and the connection design, then select a screw length and diameter that meet the project’s requirements. The products here range from #14 x 2 inches to #14 x 2-7/8 inches, with one listing that states #17 x 15.7 inches. Verify dimensions before ordering, especially when a listed size seems unusual. Do not substitute one length for another solely because both screws have flat heads.
Will the screws be exposed to weather?
For outdoor work, compare coating descriptions and intended use. Several options state that their coatings passed a 1,000-hour salt spray test; the #17 listing states 1,500 hours. These are product claims, not a guarantee of service life in every environment. Follow project requirements for treated lumber and exposure conditions.
Which drive and pack size make sense?
The LIONMAX and SG TZH products use a T30 drive, while the #17 screws list T40. Use the specified bit size and check whether it is included. Choose a 40-count pack for a smaller job, a 50-count pack for a moderate quantity, or a 94- or 100-count pack when the project calls for more fasteners.
Are these suitable for every structural connection?
No single product description here provides enough information to approve every structural connection. Confirm the fastener’s specifications against the plans, applicable building requirements, wood type, and connection details. Consult a qualified professional when the project’s load or code requirements are uncertain.
Frequently Asked Questions
What does a flat head do?
A flat countersunk head is designed to sit flush with the wood surface when installed in a suitable countersink.
What bit do these screws require?
The LIONMAX and SG TZH products list a T30 star drive. The #17 timber screws list a T40 Torx drive.
Are these screws described for outdoor use?
Yes. The product descriptions identify them for exterior timber or deck applications and list corrosion-resistant coatings. Check each product’s specifications for the conditions of your project.
Should I predrill?
The #17 screw listing recommends predrilling in dense hardwood or when installing extra-long screws. Requirements can vary with the wood and fastener, so follow the product instructions and project specifications.
What should I verify before buying the #17 screws?
Verify the stated 15.7-inch length with the seller before ordering, because it differs substantially from the other listed sizes.