SPAX® PowerLags® vs. Conventional Lags

If you have a beefy wood project on the docket, whether it be interior or exterior, you're going to need lag bolts and you're going to want SPAX® PowerLags® . Decks, fencing, pergolas, arbors, garden beds or playsets, SPAX® provides quality, stability and beauty to any project!

SPAX® PowerLags® offer the largest selection of code-recognized structural wood-to-wood fasteners in the industry. Featuring SPAX® patented thread technology, they require no pre-drilling, and drive faster and easier than conventional lags and other structural screws. 


  • Code listings ICC-ES No. ESR-1782 
  • Technical Evaluation Report – DrJ TER – No. 1711-01 (deck ledger attachment) and TER No. 1802-03 (multi-ply; LVL beams, girder truss applications)
  • Heat treated to Grade 5 durability
  • Available in 1/4”, 5/16”, 3/8” and 1/2” diameters in lengths up to 12”
  • Patented thread serrations require up to 40% less driving torque to increase installation speed while helping prevent cracking in logs
  • 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
  • Sold in job-friendly package quantities, including Bulk Pails

Stronger, more reliable SPAX® PowerLags require less tools and less time, therefore saving you money.

So, whether you're a Professional Contractor or a weekend DIY'er, your wood-to-wood connections require no predrilling, no extra tools, one impact driver and its a GO!

Hey take a virtual test drive and check out our latest video and see for yourself. For additional information on PowerLags® and all other SPAX® products check out our website at SPAX.US.  

Do it Once. Do it Right.®