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1/4 in. x 3 in. Torx Powerlag T-Star Drive Washer Head Yellow Zinc Coated Lag Screw

98¢
  • No Pre-Drilling in Wood
  • Heat-treated (Grade-5) for high strength and durability
  • Designed to be driven faster and easier than a typical screw
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Product Details

The SPAX Factor - For the craftsman that concentrates on the details, We Work for You. For the Pro that puts qualify first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. Say Good Bye to your fathers traditional lag. SPAX PowerLags offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. Made of carbon steel and coated for long term durability to ensure your project endures. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.
  • 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. 1912-23
  • True to size thread diameters, grade 5 heat treat, and the washer head style are just some of this fastener's distinct advantages. Tested under the toughest scenarios to give you confidence in every connection
  • T-Star 6 lobe design is compatible with all industry standard bits and provides superior bit engagement
  • Engineered and Manufactured in the USA
  • SPAX 1/4-in. PowerLags require a T-Star driver bit: T-30 Bit
  • Return Policy

Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

12Questions
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Q:I need to attach a long light fixture to a ceiling and attach the ends to the wood truss. Would these lag bolts work ?
by|Nov 2, 2022
1 Answer
Answer This Question

A:  Hello, Thanks for reaching out! Assuming your question is regarding the pullout of the fastener, the 1/4" Diameter PowerLag has a withdrawal (pullout value) of 375#/in. in Southern Pine, 310#/in. in douglas fir, and 245#/in. in SPF. Thanks, SPAX US

by|Nov 7, 2022
    caret
    Q:What tool do you use to actually screw these in?
    by|Jun 22, 2022
    4 Answers
    Answer This Question

    A:  I just noticed the star bit is a T-30 instead of a T-25.

    by|Jun 24, 2022

      A:  a star bit screwdriver or an electric drill with a star bit T25 or the one designated on the label, or an impact tool with the same bite at shown above.

      by|Jun 24, 2022

        A:  Hello, These can be installed using a drill or impact driver with a T30 drive bit. Thank you for being a SPAX customer. SPAX U.S.

        by|Jun 23, 2022

          A:  You need a Torx bit for a drill/driver.

          by|Jun 24, 2022
            caret
            Q:How much can this hold if screwed into a wooden ceiling joist? Im interested in the max force before this pulls out of wood, not shear strength.
            by|Sep 9, 2021
            1 Answer
            Answer This Question

            A:  The SPAX ¼” power lag has an allowable withdrawal strength of 245 lbs./inch of thread in a wood member with a specific gravity of 0.42. Height specific gravity’s will yield an increased allowable withdrawal, please refer to our DrJ TER No. 1912.07 POWERLAGS Fastener Properties 4/15/2021. That is available on our website: www.spax.us

            by|Aug 10, 2022
              1 found this answer helpful
              caret
              Q:I want to hang a large mirror weighing 70 pounds, which has saw tooth brackets on the back. Will two of these screws driven into the wall studs, leaving the head about an inch away from the wall surface, be enough to hold the mirror up safely?
              by|Aug 16, 2021
              1 Answer
              Answer This Question

              A:  The Spax ¼” X 3” power lags have an allowable shear strength of 995 and a withdrawal design value in SPF 245 pounds per inch of penetration. Keep in mind any thickness of wall material (such as Drywall) should be taken into consideration. The installation of the fastener can affect its performance. Make sure the fastener goes into the center of the stud and it has adequate threads into the stud’s.

              by|Aug 17, 2021
                Showing 1-4 of 12
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                Customer Reviews

                4.9 out of 5
                (72)
                • 4.9
                  out of 72 reviews
                • 100%recommend this product
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                Showing 1-10 of 72 reviews
                Worked good to hold swing frame.
                Worked good to hold swing frame.
                by
                • Verified Purchase
                • Recommended
                I would recommend this screw. Very happy with outcome. A little pricey but worth it at the end
                I would recommend this screw. Very happy with outcome. A little pricey but worth it at the end
                by
                • Verified Purchase
                • Recommended
                by
                • Verified Purchase
                Worked great for installing my peg board onto my tool...
                Worked great for installing my peg board onto my tool wall with a 1/4 x 1" long plastic spacer.
                by
                • Verified Purchase
                Perhaps I’m unfamiliar with the terminology, but I was expecting...
                Perhaps I’m unfamiliar with the terminology, but I was expecting standard Phillips screw heads rather than hex. I’m unable to use them without investing in hex drivers.
                by
                • Verified Purchase
                Rating provided by a verified purchaser...
                Rating provided by a verified purchaser
                by
                • Verified Purchase
                Only lags I will use....
                Only lags I will use.
                by
                • Verified Purchase
                Great for deck and shed assembly and repairs.
                Great for deck and shed assembly and repairs.
                by
                • Verified Purchase
                • Recommended
                I will never use anything but "star" screws. The grip...
                I will never use anything but "star" screws. The grip is unbelievable and gives virtually anyone the "strength" to screw into even the hardest wood. Reduces the need for pre-drilling on many projects.
                by
                • Verified Purchase
                One of the best screws I’ve used...
                One of the best screws I’ve used
                by
                • Verified Purchase
                Showing 1-10 of 72 reviews

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                Ratings
                (72)
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                (29)
                (601)
                Size1/4 in1/4 in1/4 in5/16 in
                Screw Length3 in3 in3 in3-1/8 in
                Fastener PlatingYellow ZincZincMagniCoated
                Drive StyleStarHexHexStar
                Package Quantity1111
                Interior/ExteriorInteriorInteriorExterior,InteriorExterior,Interior
                Head StyleWasher HeadHexHexWasher Head
                Fastener/Connector MaterialSteelSteelSteelSteel
                FeaturesACQ Rated,Coated,Self Drilling,Self Tapping,Serrated EdgesCoated,Self Drilling,Self TappingACQ Rated,Coated,Self Drilling,Self Tapping,Serrated EdgesACQ Rated,Coated,Self Drilling,Self Tapping
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