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Internet # 203533431

Model # 103137

Store SKU # 513777

#10 x 3-1/8 in. Star Drive Torx Bugle Head R4 Multi-Purpose Wood Screw (70-Pack)

  • Faster Drive for Improved Productivity
  • Fast Bite Tip provides a fast start for one-step installation
  • For interior / exterior use
  • View More Details
0 in stock
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Return this item within 90 days of purchase. Read Return Policy

Product Details

About This Product

GRKs R4 Multi-Purpose Framing Screw has 6 self-contained cutting pockets which act like a router and transport the drill dust away from the edge of the screw hole. They also widen the countersink hole only around the head shape. The screw head top closes the hole exactly, leaving no damaged fibers around the wider area of the head.


  • For use in wood, particle-board, cement fiberboard, plastic, sheet metal
  • Star drive eliminates stripping for improved productivity
  • Zip-Tip allows for no-pre-drilling and 1 step application
  • Self-tapping
  • No pre-drilling
  • No stripped heads
  • Common project applications: remodeling, fencing, storage, cabinets, framing
  • Return Policy

Product Information

Internet # 203533431

Model # 103137

Store SKU # 513777



Screw Length

3-1/8 in



Thread Pitch (mm)

2.6 mm

Threads Per Inch (TPI)



Drive Style


Fastener Color


Fastener Material

Carbon Steel

Fastener Type

Wood Screw


ACQ Rated, Self Tapping

Head Style

Bugle Head


Driver Bit


Exterior, Interior

Materials Fastened

Wood to Wood

Measurement System


Package Quantity


Product Weight (lb.)

0.0165 lb



Thread Style

W-Cut Thread

Warranty / Certifications

Manufacturer Warranty


Questions & Answers

Q:No warranty, for how much they are. Seems like the manufacturer isn’t real confident in all the bells and whistles. Most cheap screws give some kind of warranty, your stuck with these it looks like.
by|Jun 13, 2024
2 Answers
Answer This Question

A:  I completely understand your concern, but sometimes companies don’t offer a warranty because you don’t need one. Out of the many screw types I have used, these are the best. They are a great balance of features. Definitely try them out!

by|Jul 17, 2024

    A:  Thank you for contacting us. There is a condensed statement regarding the warranty on the backside of the tub, just above the GRK website and UPC barcode. The full terms and conditions would be on the GRK website. Please feel free to call us at (800) 222-6990 or email us at grk@itwbrands.com with any questions.

    by|Jun 14, 2024
      Q:Are these approved for ,60 below grade treated wood ? I used these in a deck I did using .60 and came back a few months later to change a couple boards and they were already rusting and about half broke when taking out.
      by|Jun 13, 2024
      1 Answer
      Answer This Question

      A:  Thank you for reaching out to us. Per the ESR, Climatek coated screws have been evaluated for use in wood treated with ACQ-D and CA-B preservatives with a maximum retention of 0.40 pcf. Please feel free to call us at (800) 222-6990 or email us at grk@itwbrands.com with any questions. We’d like to learn more details about your application.

      by|Jun 14, 2024
        Q:Can these be used to secure a 6x6 deck post to the concrete bracket? Bracket has 6 holes on both sides, so it would be 12 of these nails securing the post to the bracket. can these be used for that?
        by|May 15, 2024
        1 Answer
        Answer This Question

        A:  Thank you for reaching out to us, Anthony. There are many variables when selecting a screw and we want to ensure the best performance, so please feel free to call us at (800) 222-6990 to speak with a technical support agent.

        by|May 21, 2024
          Q:Would these screws be appropriate for building the wall studs and ceiling of a 10 x 12 x 8’ garden shed?
          by|May 5, 2024
          2 Answers
          Answer This Question

          A:  Thank you for contacting us. Since materials and applications do vary, you are welcome to call our Technical Support department at 800-222-6990 to review the specifications of your project and these particular screws.

          by|May 9, 2024

            A:  Yes! Structural rated screw .

            by|May 7, 2024
              Showing 1-4 of 125

              Customer Reviews

              4.9 out of 5

              • 4.9 out of 2,720 reviews
              • 96% recommend this product
              Filter by:
              Showing 1-10 of 2,720 reviews
              My favorate spluge as a handyman!
              Simply stated, these are great screws! They hold well, are very weather resistant and the heads don’t strip out like so many of the cheaper alternatives. I have had a lot of other screws that break when you try to remove them after a few months or years and these don’t. This means that you can save money by pulling them out and reusing them! These also have a very effective self tapping mechanism that partially drills its own hole resulting in far less wood cracking. You will still have to drill occasionally depending on your wood but i have found that running the screw half way in, backing it out a little to clear the wood shavings in the hole, then running it all the way in almost entirely eliminates cracking. I buy the small packs to keep in my screw drawer and the big pask to refill them. Great priduct!
              Response from ITW BrandsJul 15, 2024
              Thanks for sharing your positive experience with GRK, Dan! We work hard to make sure our products are well designed. We’d love to have you follow us on Instagram/Facebook, so you can be the first to know about new products! Plus, you’ll find out about our giveaways and contests.
                • Recommended
                Worked great throughout treated 4x4’s. Unlike a deck screw, these powered through, didn’t break or have the heads strip.
                • Verified Purchase
                1 found this review helpful
                Well worth the money!
                I'll never use regular Phillips head screws again. The quality of this GRK brand fasteners is amazing! No pre-drilling necessary and it never splits wood. Screws never break or bend during installation with an impact driver. Screws don't strip or rust
                  • Recommended
                  Excellent product, pricey but well worth the money
                  I've been using this GRK brand for many years already. Never had a problem with any of the products. No pre-drilling necessary and it won't split the wood. I've been using them on both, interior and exterior projects. Pressure treated Decking, indoor framing, door and window installation and many more. Strong hold on every application and won't rust. Drives in easily.and doesn't strip.
                  Response from ITW BrandsMay 1, 2024
                  Thanks for sharing your positive experience with GRK. We’re working hard to make sure everything we make works for pros like you. If you follow us on Instagram/Facebook you can be the first to know about new products and find out about our giveaways and contests.
                    • Recommended
                    Extremely Upset
                    I purchased these and there were a total of 68 screws in this “110 qty.” box.
                      • Recommended
                      Southern Sweeps
                      Southern Sweeps uses these screws to fasten the firebox to the stud wall when installing the fireplace. looks the fireplace in secure.
                        • Recommended
                        The absolute best screw for structural framing. The self starter tip will eat into pine easy and the star bit imprint is deep so that the star bit will not strip it out. Great for impact guns. Nearly a 1000 lb sheer force with the screw. You can’t go wrong if you build it strong. Get these to do it right.
                        • Verified Purchase
                        I got Significantly less than I paid for
                        I got this online and the package was open and less than half full.
                          Not sure why everyone loves them.
                          Using these for screwing down Advantech subfloor and these screws are NOT self starting. Almost all of them gave me a very hard time starting. I think it may be an issue with the batch because the picture of where the self starting part is does not match the screws I have. The self starting slot is too high on the screws I have so they just don't
                            1 found this review helpful
                            NOT suitable for exterior. Mine are all rusting.
                            25 months ago, in NY, I constructed in PT lumber some outdoor stairs. Removing stairs now and here are the first 14 (not cherry-picked) screws. This is 25 months. 1/14 shows no sign of corrosion. 13/14 showing corrosion, one with severe (threads already starting to "melt"). Note I used GRK from two batches; it was not a bad lot. Hugely disappointed. Will continue using the screws I have only for interior shelving, basement framing, etc. Absolutely not up to the task outdoors.
                              9 found this review helpful
                              Showing 1-10 of 2,720 reviews