Internet #300657700

Model #23401

Store SKU #1002419400

#9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack)

  • Serrated head for flush seating
  • Star drive with T-25 bit for one-handed installation
  • Serrated single lead thread and sharp point for immediate pick up
  • See More Details

Frequently Bought Together

+
+
Price:
$913

Product Overview

The Backer-On 1-1/4 in. Cement Board Screws are designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. Backer-On's patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile. The Star drive recess with T-25 bit provides Stikfit for 1-handed installation. Backer-On screws feature a Climacoat corrosion resistant finish that prevents rust from bleeding into grout and are perfect for use in high moisture areas such as baths, showers, countertops and floors. Conforms to ANSI A108.11 for cement board attachment. Backer-On screws can be installed with a standard impact or drill/driver and T-25 Star drive bit (included with product) for cement board fastening done right.
  • Serrated head design for flush seating even at an angle
  • Star drive with T-25 bit provides Stikfit 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, drastically reducing fractures or blow outs
  • Premium corrosion resistant finish
  • Use to attach cement board to wood or light gauge steel studs
  • Ideal for use in high moisture areas such as showers, backsplashes, countertops and floors

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Compare Similar Drywall Screws

#8 x 3 in. Philips Bugle-Head Coarse Thread Sharp Point Drywall Screws (1 lb.-Pack)#9 x 2-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (100-Pack)
current product
#9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack)
#8 x 1-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack)
BrandGrip-RiteRock-OnBacker-OnPro-Twist
Name#8 x 3 in. Philips Bugle-Head Coarse Thread Sharp Point Drywall Screws (1 lb.-Pack)#9 x 2-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (100-Pack)#9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack)#8 x 1-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack)
Price
$598
$833
$913
$1297
Ratings
(258)
(46)
(248)
(11)
Screw Length3 in2-1/4 in1-1/4 in1-1/4 in
Size#8#9#9#8
Drive StylePhillipsStarStarPhillips
Head StyleBugle HeadFlat HeadFlat HeadFlat Head
Fastener/Connector MaterialSteelSteelSteelSteel
FeaturesCoatedSelf Drilling,Self TappingCoated,Self Drilling,Self TappingCoated,Self Drilling
View ProductView ProductView ProductView Product

Specifications

Dimensions

Screw Length
1-1/4 in
Thread Pitch
0

Details

Color Family
Green
Drive Style
Star
Fastener Plating
Zinc
Fastener Type
Drywall Screw
Fastener/Connector Material
Steel
Features
Coated,Self Drilling,Self Tapping
Finish
Zinc-plated
Finish Family
Zinc
Head Style
Flat Head
Included
Driver Bit
Interior/Exterior
Interior
Measurement Standard
SAE
Package Quantity
185
Product Weight (lb.)
1.16
Returnable
180-Day
Size
#9

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.

Questions & Answers

8Questions35Answers

Can I use these for a toilet flange?

Asked by Jm May 2, 2020
1
Answer

These would be strong enough but I am not sure if the length would be sufficient for a toilet flange. It depends on your subfloor as well.

Can I use these screws to fasten cement board to .050” thick aluminum square tubing?

Asked by Jeff April 20, 2020
3
Answers

I used them to put Hardeeboard onto wood studs. Assuming any normal screw would go into aluminum then yes. But honestly I'm not sure.

Can I use these for hardie siding?

Asked by Juan June 19, 2019
4
Answers

YEs, that's what they are for.

I am attaching Hardie backer to 1 x 2 furring strips on concrete block. I measured the thickness...

Asked by JJB February 26, 2019
5
Answers

The screws are a full 1.25". The standard half inch Backerboard is actually just 0.42" so you're going to be 0.12" too long which is more like 1/8".

I cannot get the serrated head start drive cement screws into the backer board. I have even tried...

Asked by Iisahandy September 2, 2018
9
Answers

Lisa, I assume you are using the correct driver which came in the box of screws. Some of the screws use a Phillips head and some use a star shapes head. The bit that came with the screws is the one you need to use. I have used these screws and the cement board about a gazillion times and never had the problem you discribe. If you are using the correct driver but and you can't get the screw started, try drilling a hole smaller than the screw diameter. Set your drive on low speed and firmly press down on the screw head pushing straight down. The cement board Hardie Board, is actually rather soft and drills rather easily. Once you get the hang of drilling a pilot hole for the first couple of screws you will get the hang of it and not need to drill a hole first. Good luck

Has anyone used these to fasten cbu to steel studs (20 gauge or thicker)? Did they self-tap as stated?

Asked by CitizenSnips May 6, 2018
3
Answers

No we used on wood

How many square feet of 1/4" backboard would this box cover?

Asked by doorguy November 29, 2017
5
Answers

28 screws are NOT enough. I believe there are 56 dimples on each full board. Don't scrimp. At 5 cents a screw, you are only saving $1.40 a sheet.

Coverage..

Asked by Ajsk August 15, 2017
5
Answers

Depends on how many you use per sheet I like to use one every 6 inches vertically and horizontally 77 screws per sheet so almost 10 sheets

Customer Reviews

  • 248 Customer Reviews
  • 4.7 out of 5 stars overall
91% of customers recommended.
Overall Ratings
5star-icon(198)
4star-icon(31)
3star-icon(10)
2star-icon(3)
1star-icon(6)
Sort By:
Excellent Screw for any backer board
Every screw is perfect. Of course when I hit a nail head underneath then the screw cannot penetrate, but that was rare. This screw made the entire backer board project ALMOST fun! The tip easily penetrates, and the screw head has a digging action which makes the flush setting that-more-easier.
Was this helpful?
1
0
Worked just like it was recommended on video about Hardie Cement Board
Worked just like it was recommended on video about Hardie Cement Board
Was this helpful?
0
0
Forget it if you wanna put 1/2” hardie board
Cheap and flimsy. It won’t go through and lots of energy to work with. Should have stick with GRKs. Wanted to try these but now I know what a junk they are.
Was this helpful?
0
0
Awesome screws for use with Hardy board. It cuts thru the board quick and doesn't split the mater...
Awesome screws for use with Hardy board. It cuts thru the board quick and doesn't split the material.
Was this helpful?
0
0
Love these screws; very versatile and they stay in bit...
Love these screws; very versatile and they stay in bit so you can use your free hand to stabilize whatever you are securing.
Was this helpful?
0
0
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
Was this helpful?
0
0
The perfect board screw for the hardie board....
The perfect board screw for the hardie board.
Was this helpful?
0
0
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
Was this helpful?
0
0
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
Was this helpful?
0
0
Cement Board Screws
These screws worked great for attaching 1/4" cement board to the wall. These did not require any pre-drilling and easily sank into the board and sat with the head flush with the top. Super easy to use and its great that these are T25 heads - much better than phillips
Was this helpful?
0
0
Review this Product
Share your thoughts with other customers