Model # 23400

Internet # 100143730

Store SKU # 106857

1-1/4 in. Zinc-Plated Steel Flat-Head Square Cement Board Screws (200-Pack)

$8.27 /each
  • Deep square head allows for a confident drive
  • Countersinks for flush seating
  • Corrosion and rust resitant for long lasting durability



Model # 23400

Internet # 100143730

Store SKU # 106857

Use Backer-On 1-1/4 in. Zinc-Plated Steel Flat-Head Square Cement Board Screws (200-Pack) to attach cement board to wood or light-gauge steel studs. These zinc-plated screws are perfect for moist areas, such as showers and countertops. Thread designed for easy installation. No pre-drilling required.

  • Use to attach cement board to wood or light gauge steel studs
  • Ideal for use with showers, backsplashes, countertops and floors
  • Steel construction
  • Rolled gimlet drive is easy to start in dense board
  • Patented/serrated for lower installation torque
  • #2 square drive reduces cam-out
  • Rib design under .375 in. ultrathin wafer-head counter-sinks for flush-seating in boards
  • #10 diameter for increased strength in dense board
  • Zinc-plated
  • Resists corrosion

Info & Guides

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Assembled Depth (in.) 
.375 in 
Assembled Height (in.) 
1.25 in 
Assembled Width (in.) 
.375 in 
Screw Length 
1-1/4 in 
Drive Style 
Internal Square 
Driver bit included 
Fastener Callout Size 
#10 x 1-1/4" 
Fastener Plating 
Fastener Thread Type 
Fastener Type 
Specialty Fastener 
Fastener/Connector Material 
Epoxy topcoat 
Finish Family 
Head Style 
Measurement Standard 
Package Quantity 
Primary Use 
Attaching HardiBacker fiber-cement backerboard to wood or light gauge (26-20) steel 
Product Weight (lb.) 
.007 lb 
Self drilling 
Self tapping 
Tamper Resistant 
Warranty / Certifications
Manufacturer 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. 


Size: #10
Screw Length: 1-1/4 in
Fastener Thread Type: N/A
Drive Style: Internal Square
Head Style: Flat
Fastener/Connector Material: Steel
Measurement Standard: SAE
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Rated 4.5 out of 5 by 8 reviewers.
Rated 4.0 out of 5.0 by Overall good screws First time installing tile floor and I used these screws with a battery operated impact screw gun to lay down hardibacker boards and it was worked just fine. Self tapping so scews goes down easy. Took a star out because the heads are easily stripped when you messed up and go in at an angle... May 24, 2016
Rated 5.0 out of 5.0 by Excellent screws Best screws for hardiboard. Don't waste your money on rocker on screws. These worked perfectly. March 5, 2016
Rated 5.0 out of 5.0 by Easy for hanging cement board We just remodeled our bathroom and installed cement backer board on our shower/tub walls. We decided to use these specially coated cement board screws and the whole project was very easy, including creating a shower niche. I used a Bosch 18V cordless hammer drill in hammer mode at the slower speed as I found that the screws bite into the backerboard more easily with the hammer action. The screws set well and the flat shape of the head helps them sit just below the cement board surface which left a nice flat surface for the Redgard and thinset. Even when I had to set the screws close to the edge of the cement board, they went in smoothly and didn't deform the edge of the board. The screws have a square head and come with a driver bit that you can use to set them with. July 1, 2015
Rated 5.0 out of 5.0 by Screws Best thing to use with Durarock, holds tight and doesn't over penetrate. January 19, 2016
Rated 5.0 out of 5.0 by Wow! I used my impact driver to install cement boat for some tile that I had to lay. These grab tight and won't go anywhere once in. They are a giid price and include a bit that gave me no problems when it came to stripping. Good buy! November 3, 2015
Rated 2.0 out of 5.0 by Hardie not so hardy Package of screws included the square head bit. About 40 of the 200 screws stripped inside the screw heads. Used a new square headed bit from Hardie and it rounded off after installing 6 screws. October 17, 2014
Rated 5.0 out of 5.0 by Does the job perfectly Perfect for the job, easy to use, would definitely use again May 14, 2014
Rated 5.0 out of 5.0 by Nice to work with I love the deep square head instead of the typical philips head. These screws were easy to drive and didn't slip or strip out at all. The coating gives me extra confidence that rust won't become an issue down the road. February 12, 2012
  • 2016-05-28 T18:10:08.493-05:00
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