FastenMaster Cortex for Trex Decking - 100 Linear Feet
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100 linear feet of coverage

Plug dimensions of .25" in diameter and .3" deep

Each box includes 224 screws, 300 plugs and 2 setting tools

Conceals fasteners for the entire deck, including first and last boards, breaker boards, perimeter and stairs

Plugs are made Trex deck boards, ensuring plugs match the decking

No pre-drilling needed

Strong connection between deck boards and joists

Galvanized screws ACQ approved; corrosion resistant

New thread design reduces installation torque and dramatically increases fastener strength

Screw length of 2.5"


Cortex Concealed Fastening System for Trex Decking is a fast and easy way to conceal fasteners and screw heads when installing Trex decking boards. The FastenMaster Cortex box includes everything needed, including 224 screws, 300 plugs and 2 setting tools. FastenMaster recommends installing with an 18 volt cordless impact drill.

How many fasteners are needed? Horizontal trim boards less than 12" wide, use two Cortex fasteners at every framing member - rafter tail or wall stud. The screws should be 16" OC or closer. Vertical trim boards (i.e., next to a door or a window), use two Cortex fasteners every 16" OC or closer. If a trim board is 12" or wider, use three screws. Each trim board must be fastened within two inches of the end of each board.

Note: Predrilling is not required throughout the majority of the project. Predrilling is required when fastening within 1/2" of the end of a board and at mitered joints. Use a 3/16" drill bit for predrilled pilot holes.


Manufacturer FastenMaster
Brand FastenMaster
Sub Brand Cortex
Compatible Materials Trex Decking
Coverage (Linear Feet) 100
Finish Epoxy-Coated
Installation Tools Required Drill with a 1/2” Chuck either Corded or Battery Powered of at Least 18 Volts
Material Carbon Steel Screws / Trex Deck Board Plugs
Number of Plugs 300
Number of Screws 224
Package Includes (224) Screws, (300) Plugs, (2) Setting Tools
Recommended Spacing 16" OC or Closer
Recommended Use Hidden Deck Fastening
Screw Drive Type TORX ttap
Screw Size #9
Threading Dual Lead
Threads Per Inch 12

Weights and Dimensions

Length (Inches) 2.5


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