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Internet # 315169576

Model # 4191020400604

Store SKU # 1006213632

#8 x 2-1/2 in. Yellow Zinc Coated T-Star Plus Drive Undercut Flat Head Multi-Purpose Screw (133-Pack)

  • 2-1/2" Premium Interior Screw - includes 133 pieces
  • No pre-drilling needed with heat treated 4CUT point technology
  • Secure fastening in wood, concrete, masonry, metal or plastic
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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. SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.


  • Stay Stronger for Longer! Heat Treated Grade 5 Durability. Subjecting the screw to heat treating gives greater strength and reduces breakage. Tested under the toughest scenarios to give you confidence in every connection.
  • 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, conveniently allows for 1-hand overhead driving
  • 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.
  • 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.
  • Requires a T-20+ bit - included in box
  • Common applications: cabinet frames, hinge installation, indoor furniture, other general applications where yellow zinc coating is acceptable
  • Engineered and manufactured
  • Multi-purpose fastener properties report
  • Return Policy

Product Information

Internet # 315169576

Model # 4191020400604

Store SKU # 1006213632

Additional Resources

Shop All SPAX



Screw Length

2-1/2 in



Thread Pitch (mm)

2.4 mm

Threads Per Inch (TPI)



Drive Style


Fastener Color


Fastener Material

Carbon Steel

Fastener Type

Wood Screw


Self Tapping

Head Style

Flat Head


Driver Bit, Screw



Materials Fastened


Measurement System


Package Quantity


Product Weight (lb.)

.00752 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:can this screws use for sheathing plywood lay on OSB subfloor?
by|Apr 28, 2024
1 Answer
Answer This Question

A:  Hello, Typically we suggest using a 2" minimum length fastener. Depending on your layers, it is recommended to have 1.25" penetration into the joist. - SPAX US

by|May 1, 2024
    Q:Is this 1 lb box? So hard to find the larger boxes!
    by|Feb 17, 2024
    1 Answer
    Answer This Question

    A:  Hello, Yes that is a 1# box. Apologies that there is no larger box in our set for this product. SPAX US

    by|Feb 19, 2024
      Q:What is the sheer strength of this screw?
      by|Jan 21, 2024
      1 Answer
      Answer This Question

      A:  Hello, the shear value of the #8 screw is 345 pounds. *Shear strength is determined in accordance with AISI S904 using minor thread diameter when fastener is tested in threaded section. Please also note, that is the value of the screw only, shear value of connection may be different based on wood or connector values. -SPAX US

      by|Jan 24, 2024
        Q:What is the required he size to mount in concrete?
        by|Jan 25, 2023
        0 Answer
        Answer This Question
        Showing 1-4 of 5

        Customer Reviews

        4.7 out of 5

        • 4.7 out of 212 reviews
        • 82% recommend this product
        Filter by:
        Showing 1-10 of 212 reviews
        the screws work really well. There strong and don't strip out like a look of other screw companies screw when put under pressure. they go into wood really fast on hold thight.
        • Verified Purchase
        • Verified Purchase
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        The star screws don't strip and the SPAX screw doesn't break either.
        • Verified Purchase
        • Verified Purchase
        Bought this outstanding life changing box after discovering I need to join some things together, at my age I was concerned I wouldn’t be able to screw anymore but with these bad boys I was screwing for days. Highly recommended
        Response from SPAXApr 29, 2024
        WOW! "Life changing" feedback really makes our day! We are so glad to hear our product is making a positive difference for you! Thanks for sharing your experience! ~SF SPAX
        • Verified Purchase
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        its easy to use and holds well
        Response from SPAXApr 29, 2024
        Your satisfaction is our top priority! Thanks for being a valued customer! SPAX
        • Verified Purchase
        Showing 1-10 of 212 reviews