Backer-On 23505 #9 x 1-1/4 in. Star Drive Serrated Head Cement Board Screws (750-Pack)

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About This Product

Backer-On Rock-On 1-1/4 in. cement board screws (750-pack) offer a reliable, high-performance solution for securing cement boards. Designed with a patented serrated head, these screws ensure flush seating at any angle—creating a smooth surface ideal for tile applications. The star drive recess paired with the Stikfit™ bit enables one-handed installation and helps eliminate cam-outs.

Built for durability in high-moisture environments such as bathrooms and kitchens, these screws feature a premium corrosion-resistant coating that prevents rust stains from leaching into grout. Their sharp point and serrated thread design reduce installation time and eliminate the need for pre-drilling.

Highlights

• Patented serrated head ensures flush seating even at angles 

• T-25 star drive and Stikfit™ bit enable easy, one-handed installation without cam-outs 

• Serrated threads require less torque, allowing for quicker fastening 

• Sharp point provides immediate engagement—no pre-drilling needed 

• Designed to attach close to board edges with minimal risk of cracking or blowouts 

• Corrosion-resistant finish prevents rust in wet environments 

• Suitable for attaching cement board to wood or light-gauge steel studs 

• Meets ANSI A108.11 standards for cement board attachment

Dimensions

Details