SPAX JLB WI WI4255 RT
ENGINEERED FOR ULTIMATE SPEED AND STRENGTH

POWERLAGS® XF

SPAX® POWERLAGS® XF - Outfitted with breakthrough features like our innovative upper and lower 4CUT™ Technology, proprietary thread serrations and superior bit fit on a low-profile pancake head, PowerLags® XF are the ultimate fusion of uncompromising SPAX strength and industry-leading driving speed.

POWERLAGS® XF

IRC/IBC CODE RECOGNIZED. PRO APPROVED.

Born in the heart of America from a dedication to perfection, SPAX POWERLAGS® XF are made to excel with ease in structural wood-to-wood connections

American-made, rigorously inspected, built for strength

10% Faster Installation

Compared to other commercially available lags.

Power Lags XF Group
SPAX® SETS THE BAR

EXCEPTIONAL SPEED DEMANDS EXTREME ENGINEERING

German engineered and American made, SPAX® PowerLags XF are professional grade structural screws and sold in job-friendly package quantities, including bulk pails.

  • 10% FASTER INSTALLATION: Optimized thread pitch design along with SPAX 4CUT Point and serrated threads
  • Upper 4CUT for low torque driving on fasteners 4" and longer
  • NO PRE-DRILLING REQUIRED: Razor-sharp tip delivers a fast, clean start, reduces splitting, and ensures smoother installation in wood and treated lumber
  • Heat treated for strength and durability
  • Independently tested ICC-ES ESR-5358 (Structural Wood Fastener Properties
  • Independent Technical Evaluation Application Reports - TER No. 2403-114; Deck Ledger Attachment and TER No. 2410-103; Multi-ply: Sawn Lumber Assemblies & Engineered Wood Assemblies
  • Large 40% lower profile pancake head for flush finish and high clamping force - Hex head for hidden location high torque applications
  • Fastener length stamp on the head provides convenient identification without measuring and aids on-site inspections. 

SCREW STYLES

  • Hex head style
  • T-STAR PANCAKE head style
  • Yellow zinc, coating option for interior applications
  • HCR® (High Corrosion Resistance) double barrier coating for exterior use, including treated lumber
POWERLAGS XF Structural Fasteners

Lonergan Builders Inc. - Strong, Premium Lags

“You need quick, strong premium lags that don’t strip out. POWERLAGS® XF are the best structural screws we’ve used for pulling together microlams, LVLs, 2x12s and anything we need to tighten up.”Lonergan Builders Inc. - Antioch, IL

Innovation in Every Inch

Powerlags® XF for strong wood-to-wood connections

German engineered and American made, SPAX® PowerLags® XF are professional grade structural screws, the superior and preferred choice over conventional lag screws/bolts.

POWERLAG XF Diagram Black 01
No Pre-Drilling

No pre-drilling required (1/4", 5/16" and 3/8")

Tough and Durable

Heat treated for strength and durability

Tested & Certified
10% Faster Installation

Optimized thread pitch-10% faster installation, 4CUT POINT prevents splitting, and serrated threads reduce torque and fatigue.

Low Profile Pancake Head

Low profile pancake head provides a more flush finish and high clamping force.

Convenient Identification

Fastener length stamp on the head provides convenient identification without measuring and aids on-site inspections.

German Engineered - American Made - PRO Proven Technologies

Exceptionally Fast - Prevents Wood Splitting - Zero Pre-Drill - Fast Starts

Compared to other commercially available lags.

POWERLAGS XF - APPLICATION TER's

TECHNICAL EVALUATION REPORTS

Screenshot 2026 08 17 at 9 36 05 AM
Exterior Deck Ledger Attachment - DrJ TER No. 2403-114

5/16" PowerLags® XF fasteners have been tested for prescriptive solutions that are equivalent to the International Residential Code for deck ledger attachment. When installed per the technical bulletin, SPAX 5/16" PowerLags XF fasteners can be used in place of 1/2" lag screws.

Download Ledger Tech Bulletin
Screenshot 2026 08 17 at 9 36 47 AM
Multi-Ply (Truss and Beam) Assemblies - DrJ TER No. 2410-103

PowerLags® XF have been evaluated for single-side fastening of sawn lumber and engineered wood beams. When installed per the technical bulletin, SPAX PowerLags XF can be used to confidently join and secure LVL, PSL, LSL, and Sawn Lumber multi-ply beams that can be loaded on both the head and point side of the fastener.

Download Multi-Ply Tech Bulletin
Power Lags XF Pancake Group

T-STAR PANCAKE HEAD POWERLAGS® XF

The low-profile, large diameter head design provides outstanding clamping force and improved aesthetics. Deep T-STAR drive offers excellent bit engagement without requiring a “special” driver bit. Available in 1/4”, 5/16”, and 3/8” diameters, and in lengths up to 10”. SPAX HCR® Coating is approved for use in treated lumber.

XF HEX HCR

HEX WASHER HEAD POWERLAGS® XF

Provides maximum driver engagement, especially when using larger diameter/longer length parts in harder wood species. Available in 1/4”, 5/16”, and 3/8” diameters, and in lengths up to 6”. SPAX HCR® Coating is approved for use in treated lumber.

Featured Applications

VIEW ALL
Screenshot 2026 08 13 at 2 56 06 PM

SPAX® POWERLAGS® XF - Data Properties Report

SPAX offer the largest selection of code-recognized structural wood-to-wood fasteners in the industry.

SPAX is Independently Tested and Approved

DrJ Engineering TER reports use specialized testing and industry-approved evaluations to certify that products meet specific performance requirements of the appropriate sections of the appropriate building code. We follow ICC AC257 acceptance criteria for all exterior coated screws.
Residential
IRC applies to detached one-and-two family dwellings and townhouses not more than three stories.
Code compliant icon
Building Code
IBC applies to all buildings or structures that do not conform to the IRC.
made in usa

Do you Know Where Your Fasteners Were Made?

While most of our competitors ship screws in from overseas, we continuously innovate and make our fasteners from the heart of America to reimagine what structural connections should be. That means our products are ready to deliver and stock right now from our Ohio HQ to our neighbors across the U.S.

SPAX

manufactured
in Bryan, OH

90%
of structural
wood-to-wood
fasteners
are manufactured overseas
Double Barrier Coating with Power Lags92
2X the Protection

Our Double Barrier Coating

Our HCR® (High Corrosion Resistance) double-barrier coatings offer superior protection with a double barrier. First plated with a zinc base coat and finished with a durable top coat, they’re engineered to hold up to the harshest conditions. Tested and recognized for use in ground contact pressure treated lumber for exterior, freshwater general construction applications (e.g., AWPA UC1-UC4A, UCFA).

DID YOU KNOW?

Some competitors don’t actually test their coatings. They rely on data from their paint company before it makes it onto their screws.

Salt Spray Testing
B117 SALT SPRAY CORROSION TESTING

Tested Beyond the Norm

We test and inspect beyond all standards to deliver exceptional structural support—from head to point. Push past what’s expected with time-tested confidence in every connection.

SPAX Next Generation Product Innovation

SPAX New Product Innovation Coming to a Store Near You!

SPAX is working dilligently with its national retail partners to bring in the new product SKU's. Although these new products may not be in your local store yet, most national retailers have access and can service you through their "special order" process.

Related Products

PRO-Project Test Drive Sample Request

Fill our our PRO-project request form to qualify for a sample - Then give us a test drive and provide feedback.