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Internet # 314498727

Model # 23505

Store SKU # 1005837552

#9 x 1-1/4 in. Star Drive Serrated Head Cement Board Screws (750-Pack)

$34.98
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  • Backer-on rock-on cement board screws are corrosion resistant
  • Use to install Haribacker, Durock, backerboard and cement board
  • Ideal for use in showers, backsplashes, countertops and floors
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Product Details

About This Product

Backer-On Rock-On 1-1/4 in. cement board screws (750 pack) are the premier fastening solutions for installing cement boards. The patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile installation. The star drive recess combined with Stikfit bit supports easy one-handed installations and eliminates cam outs. The premium corrosion resistant finish prevents rust from bleeding into grout, making Backer-On Rock-On screws the perfect choice for use in high moisture areas such as bathrooms and kitchens.

Highlights

  • Serrated head design for flush seating even at an angle
  • Star drive with T-25 bit provides StikfitTM for easy 1-handed installation and eliminates cam-outs
  • Serrated thread forms require less torque for faster installation
  • Patented sharp point offers immediate pick-up and eliminates the need to pre-drill
  • Patented design allows attaching close to edge on cement board, reducing fractures or blow outs
  • Premium corrosion resistant finish
  • Use to attach cement board to wood or light gauge steel studs
  • Conforms to ANSI A108.11 standards for cement board attachment
  • Return Policy

Product Information

Internet # 314498727

Model # 23505

Store SKU # 1005837552

Additional Resources

Shop All Backer-On

Specifications

Dimensions

Screw Length

1-1/4 in

Size

#9

Thread Pitch (mm)

2.6 mm

Threads Per Inch (TPI)

9.8

Details

Drive Style

Torx

Fastener Color

Green

Fastener Material

Carbon Steel

Fastener Type

Cement Board Screws

Features

Self Tapping

Head Style

Flat Head

Included

Driver Bit

Interior/Exterior

Interior

Measurement System

Inches

Package Quantity

750

Product Weight (lb.)

4.66 lb

Returnable

90-Day

Thread Style

Hi-Lo Thread

Warranty / Certifications

Manufacturer Warranty

Backer-On® Rock-On®Limited Warranty - ITW Brands warrants that this product is free from defects in material and workmanship. ITW Brands’ sole liability for any breach of this warranty shall be to replace this product or refund the purchase price.

Questions & Answers

6Questions
caret
Q:Which type of screw from Backer-On is best for use with Permabase Plus?
by|Apr 13, 2024
1 Answer
Answer This Question

A:  Hi there, thank you for your interest in Backer-On. We need a few more details about your specific application as we want to ensure we are providing the best recommendation. Can you please reach our to our experts either by call or email? Please feel free to call us at (800)222-6990 or email us at teks@itwbrands.com. There we will gather the necessary specs to recommend the product you will need.

by|Apr 15, 2024
    caret
    Q:What screw should I use to screw 1/4" cement board to drywall. I have backer board screws in the studs 6" apart vertically. Still feels loose in between the studs. Want to put construction adhesive on board then screw in-between studs!
    by|Sep 2, 2023
    1 Answer
    Answer This Question

    A:  Hello - Thank you for your question. The Backer-On 9x1-1/4" Cement board screws are intended to be used to screw 1/4' cement board directly into the stud framing. If you are using multiple layers of cement board, we recommend using the Backer-On 9x2-1/4" Cement Board Screws.

    by|Sep 15, 2023
      caret
      Q:I see corrosion resistant, can you use these for Hardiplank siding outdoors? I see that it says interior.
      by|Mar 23, 2023
      2 Answers
      Answer This Question

      A:  Screws are not the best option for Hardie lap siding. Nails must be corrosion-resistant, galvanized, or stainless steel?6d or 8D, depending on your location.

      by|Jun 5, 2023

        A:  Hi, we will need more information about the outdoor application you want to use these fasteners on to best answer your question. Please reach out to us at (877) 489-2726 or email us at CS@itwbrands.com so we can better assist you!

        by|Apr 1, 2023
          caret
          Q:Does it work to install durock board on cement walls?
          by|Mar 18, 2023
          1 Answer
          Answer This Question

          A:  Hello! Our Backer-On fasteners are designed to install Durock board into wood or light gauge steel framing.

          by|Aug 20, 2023
            Showing 1-4 of 6

            Customer Reviews

            4.8 out of 5

            • 4.8 out of 206 reviews
            • 40% recommend this product
            Filter by:
            Showing 1-10 of 206 reviews
            weak screws
            predrilled the holes and every screw broke? they are meant for cement and all the heads broke off with impact driver.
            by
              We always trust this screw for the backer board installation.
              by
              • Verified Purchase
              by
              • Verified Purchase
              • Verified Purchase
              Why would you not use these when working with cement boards? They work really well and come with the bit you need for your drill. One note- If you have an impact drill I'd use that as it just makes it easier and faster when putting the cement board up.
              by
              • Verified Purchase
              • Verified Purchase
              by
              • Verified Purchase
              • Verified Purchase
              • Verified Purchase
              Excellent fasteners for cement board, the serrated heads counter sink into the boards perfectly. The star drive makes them easy to install. A star drive bit is also included.
              by
              • Verified Purchase
              Showing 1-10 of 206 reviews

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