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https://spax.us/products/powerlags/hex-washer-head-hcr-powerlags

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 lag screws.

• No pre-drilling required
• Grade 5 durability
• Code listings ICC-ES ESR-1782
• DrJ Technical Evaluation Reports (TER No. 1711-01; Deck Ledger Attachment)
• Patented thread serrations require up to 40% less driving torque to increase installation speed while helping prevent cracking in lumber
• 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
• Hex washer head provides maximum driver engagement, especially when using larger diameter/longer length parts in harder wood species
• SPAX HCR Coating is approved for use in treated lumber