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PowerLags®
ExteriorPowerLags®
T-STAR WASHER HEAD HCR® POWERLAGS®
SPAX® T-STAR Washer Head PowerLags® with HCR® coating designed with low-profile, large diameter head design provides outstanding clamping force and improved aesthetics. The T-STAR drive offers excellent bit engagement without requiring a special driver bit. Available in 1/4”, 5/16”, and 3/8” diameters. SPAX HCR® Coating is approved for use in treated lumber.
Available in: 1/4", 3/8", and 5/16" diameters
Purchase Options:
Material & Coating
Cold-rolled carbon steel wire heat treated for strength and durability and plated with an HCR® (High Corrosion Resistance) double barrier coating. HCR® is tested and recognized for use in ground contact pressure treated lumber for exterior, freshwater general construction applications (e.g., AWPA UC1-UC4A, UCFA).
Features
PowerLags® are the ideal replacement for conventional lags!
- IRC / IBC Code Compliant DrJ TER No. 1912-07 Structural Fastener Properties
- DrJ Technical Evaluation Reports (TER No. 1711-01; Deck Ledger Attachment and TER No. 1802-03; Multi-Ply; Sawn lumber assemblies and engineered wood - LVL, PSL and LSL assemblies)
- No pre-drilling required (1/4" and 5/16")
Note: Lead hole of 11/64" (0.172") diameter is required for 3/8"
- Heat treated for strength and durability
- Serrated threads require up to 40% less driving torque to increase installation speed while helping prevent cracking in wood
- Built-on washer head designs eliminate the need and extra cost of a separate washer
- Fastener length stamp on the head provides convenient identification without measuring and aids on-site inspections
SPAX ENGINEERED FASTENERS ARE THE MOST ADVANCED FASTENER PRODUCT ON THE MARKET
Typical Applications
SPAX® T-STAR Washer Head PowerLags® with HCR® are engineered for structural wood connections where high clamping force, code compliance, and corrosion resistance are required. Designed for exterior use in treated lumber, these structural screws are ideal for residential, commercial, and agricultural construction projects.
Recommended applications include:
- Multi-ply LVL, LSL and PSL beam assemblies
- Multi-ply girder truss assemblies
- Deck ledger board attachment to band joists
- Deck framing and structural deck construction
- Exterior treated lumber connections
- Timber framing and log home construction
- Retaining walls and landscaping timbers
- Fence posts, gate posts and heavy-duty fencing
- Pergolas, pavilions and outdoor structures
- Outdoor furniture and other structural wood assemblies
Videos
SPAX PowerLags HCR Outdoor Structural Construction Lag Screws
SPAX PowerLags are engineered to eliminate pre-drilling and hold stronger so you can drive more confidence in every connection.
SPAX: Ultimate Strength For Multi-Ply LVL Beams
PowerLags offer the highest withdrawal and pull-through values in the industry, perfect for Multi-Ply (LVL, PSL and LSL) assemblies
The Best Structural Screws For Deck Ledger Installation SPAX® POWERLAGS®
SPAX® 5/16” HCR PowerLags require up to 50% fewer fasteners than competing structural screws for deck ledger board installation applications
Downloads
Product Brochures
Application Guides
Code Reports
Product Submittals
Reference Lateral Shear Values
CAD & Dimensional Drawings
Download AllDesign Values & Loads
Southern Pine(SG=.55)
| Diameter | 1/4" | 5/16" | 3/8" |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 375 | 415 | 465 |
| Head Pull-Through WH (lbs.) | 850 | 965 | 1245 |
Douglas Fir(SG=.50)
| Diameter | 1/4" | 5/16" | 3/8" |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 310 | 300 | 300 |
| Head Pull-Through WH (lbs.) | 785 | 840 | 1085 |
Hem Fir & Spruce-Pine-Fir(SG=.42)
| Diameter | 1/4" | 5/16" | 3/8" |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 245 | 250 | 280 |
| Head Pull-Through WH (lbs.) | 585 | 665 | 880 |
ALLOWABLE WITHDRAWAL (W), HEAD PULL-THROUGH (WH)
- “Withdrawal” and “Head Pull-Through”, and design values shall be adjusted by all applicable adjustment factors per NDS Table 11.3.1.
- “Withdrawal” design values are to be multiplied by the length of the thread penetration into the side grain of the main member. Length includes tip.
- “Withdrawal” design values are from the main member, and “Head Pull-Through” design values are based on a minimum of 1-1/2" side member thickness.
- Tabulated “Withdrawal” and “Head Pull-Through” design values are for the wood species with the listed assigned specific gravities. Where the wood species assigned specific gravity is not listed, use the next lower assigned specific gravity values.
Learn More About SPAX® Powerlags®
Featured Applications
VIEW ALLExterior