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Model # 23405

Internet # 202055941

Store SKU # 717202

#10 x 1-1/4 in. Zinc-Plated Steel Flat-Head Square Cement Board Screws (800-Pack)

This item has been discontinued.
The Home Depot no longer carries this specific product.

$24.48 /each




Model # 23405

Internet # 202055941

Store SKU # 717202

The Backer-On #10 x 1-1/4 in. Zinc-Plated Steel Flat-Head Backer-On screws are designed for attaching HardiBacker fiber cement backerboard to wood or light gauge steel studs. Ideal for use in high moisture areas such as baths & showers, sink backsplash, countertops and floors. Backer-On's self-drilling point eliminates the need to pre-drill, and a special patented thread design reduces installation torque and provides superior holding power. Special rib design under the head countersinks for flush seating in board, providing a smooth surface for tile. Backer-On screws feature a corrosion resistant finish which prevents rust from bleeding into tile. Backer-On screws conform to ANSI A108.11 for cement board attachment and install with a standard screwgun and a #2 square drive bit (included with product).

  • Ideal for use in high moisture areas such as baths and showers, sink backsplash, countertops and floors
  • For attaching fiber cement backer board such as hardibacker to wood and light-gauge steel studs
  • Zinc-plated steel construction
  • Corrosion-resistant finish prevents unsightly rust from bleeding into the tile
  • Thread design reduces installation torque and provides holding power and easy installation into dense board
  • Special rib design under each head countersinks for a flush seating in the board providing a smooth surface for tile
  • Self-drilling points eliminate the need to pre-drill
  • #2 square drive reduces cam-out
  • #10 - increased strength in dense board
  • Install with a standard screw gun (not included) and a #2 square drive bit (included)
  • Meets ANSI A108.11 standards for cement board attachment


Assembled Depth (in.) 
.190 in 
Assembled Height (in.) 
1.25 in 
Assembled Width (in.) 
0.19 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 finish 
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. 


Rated 3.4 out of 5 by 8 reviewers.
Rated 3.0 out of 5.0 by Points to watch for I have used these Backer-On screws for multiple floor and wall backerboard installations. My opinion of them is not terribly complimentary. An irritating point that I'd like to mention having seen again and again in reviews is that the manufacturer of these screws is often misidentified as James Hardie Building Products, the same people who make HardieBacker. This is not true. These screws are produced by Buildex, a well-known and well-respected fastener manufacturer. The same company also produced Rock-On, designed for use with Durock cement board. HD stocks these fasteners right next to cement board piles, for obvious reasons, but while the Backer-On screws were designed for use with HardieBacker, they really don't do as good a job with this unusual cement board as you might think. For starters, these screws claim to have self-drilling points. This encourages casual DIYers and contractors in a hurry to put them in without, well, drilling holes for them (with masonry bits). HardieBacker is temperamental stuff. If you drive one of these screws through it with a standard driver, a bump of cracked material usually forms on the back side of the board, pulling the HardieBacker off the floor. The coarse threads on these screws will then often cause the board to travel up the length of the screw to the cutting head, which will then overcut the board as the screw drives down. All in all, putting in these screws can be a tricky mess, and the notion that you can put them in with a standard driver and no drilling and reliably achieve a high-quality application is unrealistic. As always with all things Hardiebacker, the problems are less obvious on the 1/4" HardieBacker than on the thicker .41" Hardiebacker 500. To ensure a flatter back to your cement boards, it's best to drill 3/16" holes with a masonry bit in your Hardiebacker before putting it down or on a wall. I also follow that up with a creating a hollowed-out cup on the beginning of the drill hole with a 3/8" masonry drill bit. So why use these screws at all instead of any zinc-plated corrosion-resistant screws? I still like the big heads, and when prepared properly, a board will lay very evenly with these in it. But especially if you're planning on laying really nice tile or stone floor tile on 1/4" HardieBacker for a lasting application, or if you're using the thicker HardieBacker 500 for wet wall applications,, drill those holes, form those cups, don't rely on the screws to perform as implied in this heavy and dense fiber cement board. HardieBacker is frankly awesome stuff, butt it takes work and practice to get used to working with it and getting it to perform at its best. September 4, 2015
Rated 4.0 out of 5.0 by decent screws Using an impact driver makes putting these screws in go much easier than a regular drill. Some of the heads were deformed on these and had to trash them, but all in all they were a great buy. Have only had the tile in for about 6 months now, so not sure how they will do over time but so far so good. August 17, 2013
Rated 3.0 out of 5.0 by just ok screws like others have said, these hardi screws are very difficult to drive flush. I have used 500 or so on the 1/2 hardi board and will go ahead and finish the box. However, the next box I buy will be 1+1/4 decking screws. July 2, 2015
Rated 2.0 out of 5.0 by HardiBacker Screws not so good I have experienced exactly what others on the boards have; the screws separate from the board and are not always flush. I just removed some screws from a tile job done a couple of years ago in a bathroom and to my dismay the screws were already rusted on the outside badly. So back to the drawing board for Hardi, because I am not convinced that they wont rust. Best-Stainless steel September 27, 2012
Rated 5.0 out of 5.0 by hardie Backer on screws I have used these on several jobs and have had nothing but good results. With an impact driver I have found that they do indeed pull the backer board flush with either floor joists or wall studs. In my uses the bit tends to last about 1200 screws before it breaks. The floors I have re-done (due to the "pros" using roofing nails instead of screws) no longer have that "crunching" noise when walked on. November 10, 2014
Rated 5.0 out of 5.0 by Great screws Anybody who cant screw in these screws should not be using them. I am a professional contractor and have no problem screwing them in with an impact driver. Hardibacker can split if you drive a screw to close to the edge, but that has nothing to do with the screw. September 6, 2014
Rated 1.0 out of 5.0 by Won't screw flush, breaks hardiebacker at corners, won't pin hardiebacker to studs Just got through replacing all the hardiebacker screws with GRKs multi-purpose screws. The GRKs went in far easier, actually pinned down the board which was 1/4 to 1/8 inch off the studs due to the hardie screws. I thought I noticed the hardie screws pushing out the board when I was nearly spraining my wrist trying to drill them in. I ended up using just 1 hardie screw to just initially drill into the board and then using the GRKs which went in easy, pinned the board to the wall, and countersank easily. July 11, 2014
Rated 4.0 out of 5.0 by good screws I use these screws with plywood on floors, best option. January 24, 2014
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