Cortex Driller Hidden System for Steel Deck Framing
Cortex Driller Hidden System for Steel Deck Framing
The FastenMaster Cortex Driller Hidden Fastening System is the fastest, easiest way to hide the heads of fasteners on deck boards used on steel deck framing. Perfect for use on perimeter boards, stairs, and breaker boards to create a completely hidden fastened deck.
The 1-5/8”Cortex Driller fastener requires no predrilling into steel deck framing. Simply drive the fastener at the preset level using the setting tool to fasten the board and create a clean, cored hole. Next, gently tap in the plug made of the same decking material to create a fastener free surface.
The Cortex Hidden Fastening System is available for all colors of Trex Transcend Decking: Fire Pit, Gravel Path, Lava Rock, Rope Swing, Spiced Rum, Tree House and Vintage Lantern.
Available in 100 lineal foot boxes, complete with 224 screws, 300 plugs, and 2 setting tools per package.
This product features a 410 stainless steel fastener. Fastener and plug performance is guaranteed for the life of the project. Please see our written warranty below.
- Available Options
- Installation Instructions
- Technical Data
- Product Warranty Information
- Related FM Products
Using one of the drills listed below and the Cortex setting tool, drive the Cortex fastener to the preset level below the deck surface. Continuously drive the fastener at one speed until the setting tool disengages on its own. Do not stop and start the drive as this may affect the finished appearance. It is important that the Cortex screw is driven perpendicular to the deck, with two screws per joist. The setting of the Cortex screw creates a cored hole in the deck surface. Place the Cortex engineered plug into the hole with the deck surface side up. Gently tap the plug into the cored hole until the plug is flush with the deck surface.
Suggested drills:
- Corded drill with 1⁄2" chuck
- Cordless drill with 1⁄2" chuck and 18V battery
- Impact driver
- Using the setting tool, drive the fastener to the preset level below the deck surface. It must be driven perpendicular to the deck, with two screws per joist.
- Place the plug into the cored hole and gently tap until it is flush with the deck surface.
NOTE: To get a smooth finished look, it may be necessary to predrill a 5⁄32" pilot hole through the deck board. No need to predrill the steel framing.










