Best Wood Lag Screws in 2026

Flat Head Multi-Material Construction Screws With T-Star Plus Drive And Yellow Zinc Coating For Interior Use Are The Versatile Fastening Solution For A Wide Range Of Applications In Multiple Materials Including Wood, Drywall, Masonry, Sheet Metal, And Plastic

Brand: PRIMESOURCE

Product Dimension: 3.0"L x 2.0"W x 4.0"H

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

CORROSION RESISTANT: Bronze ceramic coat exceeds 1,000 hour salt spray test under ASTM B126

STAR DRIVE, TRUSS HEAD: Eliminate cam-out for a smooth, effortless drive every time

T-Star Washer Head Screw: These T-star Washer Head screws are made of carbon steel and feature High Corrosive resistant (HCR) coating which makes these screws ideal for use in treated lumber and exterior applications

Grade 5 Durability: SPAX T-star Screws heat treated to improve strength and reduce breakage. These superior quality screws are great for both interior and exterior applications

Patented Thread Technology: Featuring SPAX patented thread technology, these wood screws require no pre-drilling, and drive faster and easier than conventional lags and other structural lag screws. T-Star plus head provides superior bit engagement

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

CORROSION RESISTANT: Bronze ceramic coat exceeds 1,000 hour salt spray test under ASTM B120

STAR DRIVE, TRUSS HEAD: Eliminate cam-out for a smooth, effortless drive every time

T-Star Washer Head Screw: These T-star Washer Head screws are made of carbon steel and feature High Corrosive resistant (HCR) coating which makes these screws ideal for use in treated lumber and exterior applications

Grade 5 Durability: SPAX T-star Screws heat treated to improve strength and reduce breakage. These superior quality screws are great for both interior and exterior applications

Patented Thread Technology: Featuring SPAX patented thread technology, these wood screws require no pre-drilling, and drive faster and easier than conventional lags and other structural lag screws. T-Star plus head provides superior bit engagement

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

No pre-drilling

Star drive helps eliminate campout

T-Star Screw: The trend setting low profile built-on washer head design offers a contemporary & sleek finished installation. Excellent draw down strength without the need for a separate washer delivers superior clamping ability and 40% less driving torque

Heat Treated Grade 5 Durability: Stay Stronger for Longer! Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage. Tested under the toughest scenarios to give you confidence in every connection

Check out our Threads: Our patented thread technology allows the washer head screw to be driven faster, is easier to install, and reduces splitting in wood. Let SPAX take some of the hassle out of your next project. The item includes a bit in the pail

Check out our Threads! Our patented thread serration technology allows the screw to be driven faster, reduces splitting in wood, and reduces driving torque by 40 percent. Let the SPAX FACTOR take some of the hassle out of your next project

The ideal replacement for the conventional lag. IRC/IBC Code Compliant: TER-No. 1912-07

Engineered and Manufactured in the USA

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

CORROSION RESISTANT: Bronze ceramic coat exceeds 1,000 hour salt spray test under ASTM B122

STAR DRIVE, TRUSS HEAD: Eliminate cam-out for a smooth, effortless drive every time

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

CORROSION RESISTANT: Bronze ceramic coat exceeds 1,000 hour salt spray test under ASTM B132

STAR DRIVE, TRUSS HEAD: Eliminate cam-out for a smooth, effortless drive every time

Premiun Material: Heavy duty screw bolts are made from 18-8 (304) stainless steel and coated with black oxide, which is certified, good look, strength and corrosion resistant.

Mighty Grip: these bolt screws feature deep wood screw coarse threads for superior holding and prevent stripping in the material; Can be applied in even severe environment. Often using with washer which distribute the pressure of the head evenly so that to prevent pull through.

Standard and Various Sizes: the kit includes 5 different most common used sizes: 1/4 x 1", 1/4 x 1-1/2", 1/4 x 2", 1/4 x 2-1/2", 1/4 x 3"; Diameter are all 1/4"; Thread Type are all Coarse (standard); Quantity: 108 pieces screws and washers in total (54 sets)

Standard:ANSI B18.2.1

Thread Size: 5/16 inch; Screw Length: 5 inch

Hex Drive Size: 1/2 inch; Package: 8 Pcs

Check out our Threads! Our patented thread serration technology allows the screw to be driven faster, reduces splitting in wood, and reduces driving torque by 40 percent. Let the SPAX FACTOR take some of the hassle out of your next project

The ideal replacement for the conventional lag. IRC/IBC Code Compliant: TER-No. 1912-07

Engineered and Manufactured in the USA

Lag Screw: The trend setting low profile built-on washer head design offers a contemporary and sleek finished installation. Excellent drawdown strength without the need for a separate washer delivers superior clamping ability and 40% less driving torque

Heat Treated Grade 5 Durability: Stay Stronger for Longer! Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage. The washer head screw is tested under the toughest scenarios to give you confidence in every connection

Check out our Threads: Our patented thread serration technology allows the corrosion-resistant screw to be driven faster, easier to install, and reduces splitting in wood. Let the SPAX FACTOR take some of the hassle out of your next project

Designed to attach objects to wood and anchor masonry

Zinc finish provides fair corrosion and rust protection

Coarse threads requiring a pre-drilled hole with minimal clearance above the fastener

Re-mounting, but lost your old hardware? This kit includes everything you'll need for wood or concrete installs.

Our lag bolts are custom-hardened to prevent snapping or breaking.

Note: Concrete anchors are not compatible with wood and drywall

Exterior grade code compliant wood screws

Low profile flat head design minimizes interference with connectors and finish materials

Comparable to 1/2" lag screws

Designed for wood to wood connections

Comparable to 3/8" lag screw

5/16" hex head for maximum drivability

Size: 1/4 inch X 1-1/2 inch

Heavy duty wood screw with 6 sided hex bolt head

Features deep wood screw threads and does not accept a nut

Easy Installation: Need to mount your TV but no extra lag bolts or concrete anchors? This kit includes M8 in lag bolts for TV wall mounts and concrete wall anchors.

Heavy Duty - Our M8 lag bolts & washers are made of durable steel material, capable of heavy duty. They can keep your TV secure on the TV wall mount.

Durable and Stable: Our Concrete anchors are made of durable plastic and are highly resistant to rust. These anchors expand and lock in place once the screw is driven into the cavity. The two-way expansion increases the holding power and ensures that they won't budge no matter what.

MULTI-MATERIAL FUNCTION: The pack of 25 hex lag screws are designed to attach objects to wood and anchoring masonry

CORROSION-RESISTANT FINISH: The screws' zinc plating offers moderate protection against rust and corrosion

COARSE SCREW THREAD: Designed to prevent splitting or snapping in pre-drilled material

Best quality and Durable - This Hex Head Lag Screw made by Zink plated Steel to use both indoor and outdoor, Zinc plated surfaces are rust resistant. They have performance to instantly penetrate in high hardness and good toughness. Zinc plated surface also prevents corrosion and oxidation in both fresh and saltwater appliances.

Dimension - It has 0.3125-inches lag screws and 4-inch long. The lag type screw helps to make strong bonding and prevents stripping in materials. There is only one unit. Find the sizing option to get more quantity. Thank You!

This black zinc plated lag bolt is typically used for joining two pieces' wood or metal plate on wood. No need pre-drilling on wood surfaces. But if you want to join with metal object, you need pre-drilling. If the drilling is more than Bolt, can use washer.

Drill, Screw, Glue & Plug in under 20 seconds

Unique Red Balau plugs 5/16" diameter offer easy insertion & extremely tight fit

Revolutionary glue nozzle coats the sides of the countersink hole

ENGINEERED FOR THE OUTDOORS: Common applications include decks, stairs, playsets, and many other outdoor wood projects

CORROSION RESISTANT: Bronze ceramic coat exceeds 1,000 hour salt spray test under ASTM B134

STAR DRIVE, TRUSS HEAD: Eliminate cam-out for a smooth, effortless drive every time

Check out our Threads! Our patented thread serration technology allows the screw to be driven faster, reduces splitting in wood, and reduces driving torque by 40 percent. Let the SPAX FACTOR take some of the hassle out of your next project

The ideal replacement for the conventional lag. IRC/IBC Code Compliant: TER-No. 1912-07

Engineered and Manufactured in the USA