Internet #300661805

Model #23421

Store SKU #1002419403

#9 x 2-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (100-Pack)

  • Seats flush even when driven at an angle
  • One handed installation (includes T-25 star drive bit)
  • Immediate pick-up into cement board
  • See More Details

Frequently Bought Together

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Price:
$894

Product Overview

The Backer-On 2-1/4 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 StikfitTM 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 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, 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
  • Conforms to ANSI A108.11 standards for cement board attachment
  • Best Screws And Nails For Drywall

Info & Guides

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Price
$598
$894
$1297
$1297
Ratings
(104)
(77)
(6)
(11)
Screw Length3 in2-1/4 in2-1/4 in1-1/4 in
Size#8#9#8#8
Drive StylePhillipsStarPhillipsPhillips
Head StyleBugle HeadFlat HeadFlat HeadFlat Head
Fastener/Connector MaterialSteelSteelSteelSteel
FeaturesCoatedCoated,Self Drilling,Self TappingSelf DrillingCoated,Self Drilling
View ProductView ProductView ProductView Product

Specifications

Dimensions

Screw Length
2-1/4 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
100
Product Weight (lb.)
1.1
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

5Questions9Answers

Does this product have a UL mark ?

Asked by max January 11, 2019
3
Answers

Yeah

Can this be screwed into masonry?

Asked by AB December 2, 2019
2
Answers

No. For masonry edges, use Tapcons (which require drilling a pilot hole prior to screwing in). If the entire field is masonry, try gluing down with lots of construction cement or just prepare the surface with leveler or filler prior to tiling.

my contractor tells me that these screws cannot be used with steel studs. He wants to use drywal...

Asked by ROB February 19, 2020
2
Answers

These work well with steel studs, but caution is needed so as not to over-tighten and strip the screw's purchase in the steel. Drywall screws will eventually rust and stain the backer board.

can these screws be used on regular drywall or will they destroy the paper with their heads?

Asked by Oren January 22, 2021
1
Answer

Yes, you can use them to install sheetrock.

What is the Rockwell C hardness?

Asked by Robe February 9, 2020
1
Answer

I don't know what the HRC of this product is but any rating over the mid fifties is considered hard. These are very strong screws so I don't know why you would need to know the HRC. They work as intended and I imagine the ones I used will still have a tight grip long after I'm dead and gone. If you want a definitive answer you'll have to contact the manufacturer.

Customer Reviews

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Some came bent in plastic container. Were not damaged during...
Some came bent in plastic container. Were not damaged during shipment, but are a lack of quality control from company. These are made in Taiwan, and are not affiliated with James Hardie Co even though they say backer-on on the pkg.
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Response from PaslodeJanuary 19, 2021
Thank you for sharing your feedback. We are sorry to hear that your experience with our product did not match your expectations. Please feel free to call us at (877) 489-2726 or email us at CS@itwbrands.com. We’d like to learn more about your experience and make things right.
Great sucking power. Sharp bit...
Great sucking power. Sharp bit
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Rating provided by a verified purchaser...
Rating provided by a verified purchaser
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Rating provided by a verified purchaser...
Rating provided by a verified purchaser
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Using to reach bottom one by...
Using to reach bottom one by
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Screws workerd good I would recommend them for anyone put...
Screws workerd good I would recommend them for anyone put in a subfloor
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Installed backer board using Backer-On #9 x 2-1/4 in. with...
Installed backer board using Backer-On #9 x 2-1/4 in. with Serrated Flat Head Star Drive Cement Board Screws on bathroom floor. They instantly fastened onto the floor without damaging the backer board. The star tip never slipped off the screwhead giving an even countersink surface. I reccomend
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Use nothing but the best
Use nothing but the best
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Excellent screws and easy to use!...
Excellent screws and easy to use!
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