Cortex Concealed Fastening System for Azek Decking

Cortex Concealed Fastening System for Azek Decking

DecksDirect Item #5257

Cortex Concealed Fastening System for Azek Decking

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Starting at: $69.99

The final product price may change based on the combination of size/type/finish/style you choose.

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 Durable   DIY Friendly   Authorized Dealer

FastenMaster deck screws and fasteners are considered to be the gold standard... Learn More



The FastenMaster Cortex Fastening System is the fastest, easiest way to conceal the heads of your deck screws on Azek decking. Cortex offers a strong connection between the deck board and the joist and can conceal fasteners across the entire deck: first and last board, perimeter, and stairs. Set the screw. Set the plug. You're all set!

Key Features
• Fast and Easy: The deck boards are fastened in the same way as a traditional deck
• Strong Connection: A through-fastened deck offers the highest level of board-to-joist connection and deck racking strength
• Cost Effective: Less expensive than virtually any other hidden fastening system
• Fully Tested: All Cortex components have been fully tested and are guaranteed
• Made in the USA

Product Specifications

Drive TypeSquare or Torx TTap (rolling change)
Head TypeComposite Head
Screw Length2-3/4"
Screw Size#8
ColorsArbor Collection: Acacia, Brazilian Walnut, Hazelwood, Morado, Mountain Redwood, Silver Oak
Harvest Collection: Autumn Chestnut, Brownstone, Island Oak, Kona, Slate Gray
Vintage Collection: Cypress, Dark Hickory, Mahogany
XLM Tropical: Harvest Bronze
Not all colors available in all sizes.
Material TypeSteel with 3 layer epoxy coating
Pack SizeXLM Tropical: 224 piece
Arbor, Harvest & Vintage Collections: 350 piece and 1,050 piece
Coverage Estimate224 Piece Box: 100 lineal feet
350 Piece Box: 100 sqft
1050 Piece Box: 300 sqft
Package Contents224 Piece Box: (224) #8 x 2-3/4" screws, (300) plugs and (2) Cortex setting tool
350 Piece Box: (350) #8 x 2-3/4" screws, (400) plugs and (2) Cortex setting tool
1050 Piece Box: (1050) #8 x 2-3/4" screws, (1200) plugs and (6) Cortex setting tool
WarrantyFastenMaster Guarantee of Performance
OtherMade in the USA!

Additional Information

Additional Information

DD # 5257
Manufacturer FastenMaster

Cortex Concealed Fastening System Installation Instructions (123 KB) 

Cortex Concealed Fastening System Brochure (594 KB) 

Cortex Concealed Fastening System Warranty (123 KB) 


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FastenMaster deck screws and fasteners are considered to be the gold standard among professionals. With over a dozen options to choose from, you can be sure you’ll find the perfect hardware for any decking project.


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FastenMaster is constantly expanding their product line in order to ensure customers get exactly what they need at the right price. The TimberLOK Truss Screws are designed for wood-to-wood projects while the ThruLOK Screw Bolts secure posts and beams without the need for pre-drilling. The LedgerLOK Ledger Board Fasteners are some of the best available and could easily be considered the industry-standard.


FastenMaster products are recommended by professionals for quick but long-lasting results with no pre-drilling and a higher shear strength than lag screws, available here at

Features and Benefits
 Durable Quality This brand offers products that are built to last and withstand the elements.
 DIY Friendly This brand is reliable and easy-to-install for professionals and DIYers alike.
 Authorized Dealer DecksDirect is an authorized dealer of this brand, dedicated to service and selection for our customers nationwide.
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