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Internet # 315173740

Model # 4191670500404

Store SKU # 1006213443

#10 x 1-1/2 in. HCR-X T-Star Plus Flat Undercut Interior/Exterior Multi-Purpose Screw (125 Per Box)

  • Patented thread serration technology enables fast driving
  • 4Cut point prevents splitting and pre-drilling in wood
  • T-Star Plus bit provides superior bit engagement
  • View More Details
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Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

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. This high performance wood screw is not your average screw. While it is designed for wood applications it is also functional for other materials like masonry, drywall, plastic, and up to 24ga steel. Masonry and Concrete do require pre-drilling. It is made with carbon steel and coated for durability to fasten strongly and securely. 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, easier to install, and reduces splitting in wood. Let the SPAX FACTOR take some of the hassle out of your next project.
  • No required pre-drilling in wood. Be more efficient on the job by eliminating time consuming steps with self drilling SPAX UNIQUE 4CUT POINT technology.
  • T-Star plus drive provides superior bit engagement. Better bit engagement means quicker installation with less effort. Welcome to the world of one-hand overhead driving.
  • Patented multi-head countersinks the screw head flush in wood
  • Stay Stronger for Longer! Heat Treated Grade 5 Durability. Subjecting the screw to heat treating gives greater strength and reduces breakage. Tested under the tougest scenerios to give you confidence in every connection.
  • Requires a T-20+ bit - included in box
  • Common applications: exterior treated lumber, deck board installation, outdoor furniture, play structures, shed construction, 2-by framing connections not recommended for cedar or redwood
  • Engineered
  • TER no. 2010-02 - multi-purpose fastener properties report
  • Return Policy

Product Information

Internet # 315173740

Model # 4191670500404

Store SKU # 1006213443

Additional Resources

Shop All SPAX



Screw Length

1-1/2 in



Thread Pitch (mm)

3 mm

Threads Per Inch (TPI)



Drive Style


Fastener Color


Fastener Material

Carbon Steel

Fastener Type

Wood Deck Screws


ACQ Rated, Self Tapping

Head Style

Flat Head


Driver Bit, Screw


Exterior, Interior

Measurement System


Package Quantity


Product Weight (lb.)

1 lb



Thread Style

Coarse Thread

Warranty / Certifications

Manufacturer Warranty

For warranty information on this product, please call the Customer Service Center at 1-800-435-4654.

Questions & Answers

Q:Is the included Spax T-Star Plus T-20 bit Impact Rated for use in an impact driver?
by|Jul 24, 2023
1 Answer
Answer This Question

A:  Hello, Yes the T-Star + bit can be used in a 1/4" impact. SPAX US

by|Jul 25, 2023
    Q:Can these be used with hardie plank siding. If so is predrilling required?
    by|Jul 12, 2023
    1 Answer
    Answer This Question

    A:  Hello, Please refer to Hardi-Plank install guidelines referring to fasteners for best results. SPAX may work in this application assuming it's attaching over a wood substrate. Hardi suggests using a ribbed bugle fastener head and results may vary with our SPAX Multi-head.

    by|Jul 12, 2023
      Q:Why are these not recommended for use with cedar or redwood?
      by|Oct 16, 2022
      1 Answer
      Answer This Question

      A:  Hello, Thank you for reaching out! Due to the high tannin content in Cedars and Redwoods, it makes it susceptible to leaving a blackish color streak stain over time from the reaction with the screw. Stainless steel is suggested for those types of woods. Thank you! SPAX U.S.

      by|Oct 17, 2022
        Q:what size t-star?
        by|Sep 11, 2022
        1 Answer
        Answer This Question

        A:  Hello, These require a T-20 bit. We suggest use of a SPAX T-Star+ bit. Thank you, SPAX U.S.

        by|Sep 12, 2022
          Showing 1-4 of 5

          Customer Reviews

          4.4 out of 5

          • 4.4 out of 200 reviews
          • 64% recommend this product
          Filter by:
          Showing 1-10 of 200 reviews
          • Verified Purchase
          Quality exterior deckscrews
          I am very satisfied with the SPAX #10x exterior / deckscrews at 3 inches with flat heads and included t-20 bit. They work lovey, as advertised, for treated lumber in an exterior application and did not require any pre-drilling. There were about 67 screws to a box for these small 1lb boxes, but they do have larger boxes available when in stock. I grabbed these as they were the only ones available at the time of purchase. I am very pleased with them and they worked great for a pressure-tread ramp.
            • Recommended
            Have a tendency to snap off during installation
            SPAX exterior deck screws are good but not great. The screws have a tendency to snap during installation at the location where the screw transitions from the smooth section of the shank to the threaded section of the shank. I used Simpson Strong-Tie hex head screws where I could get away without using flush head screws.
              • Recommended
              1 found this review helpful
              Quality Deck Screw!
              I screwed over 1,000 of these into 2X6 deck boards and not one bad screw. They easily self tap into the wood without much effort which saves a lot of time. I used my own Milwaukee bit so I can’t comment on the one that was included in the box. I will definitely use these again.
                • Recommended
                Screws go in like butter, heads do not strip easily....
                Screws go in like butter, heads do not strip easily. Only time will tell if they rust.
                • Verified Purchase
                • Verified Purchase
                • Recommended
                • Verified Purchase
                • Verified Purchase
                • Verified Purchase
                Screws fine...should include a drill bit
                • Verified Purchase
                Showing 1-10 of 200 reviews