#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
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Frequently Bought Together
Product Overview
- 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
Product Overview
- 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
Compare Similar Drywall Screws
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| Brand | Grabber | Backer-On | Pro-Twist | Pro-Twist |
| Name | #8 x 1-1/4 in. Flat Washer Head Phillip Cement Board Screw (50-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) | #8 x 2-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) |
| Price | $598 | $886 | $1297 | $1297 |
| Ratings | (4) | (266) | (11) | (6) |
| Screw Length | 1-1/4 in | 1-1/4 in | 1-1/4 in | 2-1/4 in |
| Size | #8 | #9 | #8 | #8 |
| Drive Style | Phillips | Star | Phillips | Phillips |
| Head Style | Washer Head | Flat Head | Flat Head | Flat Head |
| Fastener/Connector Material | Steel | Steel | Steel | Steel |
| Features | Coated | Coated,Self Drilling,Self Tapping | Coated,Self Drilling | Self Drilling |
| View Product | View Product | View Product | View Product |
Compare Similar Drywall Screws
| | | | |
| Brand | Grabber | Backer-On | Pro-Twist | Pro-Twist |
| Name | #8 x 1-1/4 in. Flat Washer Head Phillip Cement Board Screw (50-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) | #8 x 2-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) |
| Price | $598 | $886 | $1297 | $1297 |
| Ratings | (4) | (266) | (11) | (6) |
| Screw Length | ||||
| Size | ||||
| Drive Style | ||||
| Head Style | ||||
| Fastener/Connector Material | ||||
| Features | ||||
| View Product | View Product | View Product | View Product |
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Questions & Answers
I cannot get the serrated head start drive cement screws into the backer board. I have even tried...
Asked by Iisahandy September 2, 2018Lisa, 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
How many square feet of 1/4" backboard would this box cover?
Asked by doorguy November 29, 201728 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, 2017Depends 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
I am attaching Hardie backer to 1 x 2 furring strips on concrete block. I measured the thickness...
Asked by john February 26, 2019The 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".
Can I use these for hardie siding?
Asked by Juan June 19, 2019YEs, that's what they are for.
Can I use these screws to fasten cement board to .050” thick aluminum square tubing?
Asked by Jeff April 20, 2020I'm not sure if these would work perfectly because I have utilized them this way, however if you pre-drill I think they should work. If that don't work for you get a flat head steal screw and drill I pilot hole in the backer board and then attach to aluminum.
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, 2018No we used on wood
Can I use these for a toilet flange?
Asked by JM May 2, 2020These 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.
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