The Simpson EB-TY Hidden Deck Fastener for TimberTech Decking is a polypropylene biscuit fastener system designed to keep every fastener completely out of sight, delivering a clean, seamless deck surface that looks professional from day one. Each fastener fits into a slot cut into the edge of the deck board using a standard biscuit joiner, so all securing hardware stays hidden in the board edge rather than on top of the walking surface. Once the EB-TY is in place, nesting each successive board against it automatically creates consistent spacing and uniform height - no manual measuring, no spacer tools, no guesswork.

Key Features

• Top-side fastening installation - all screwing is done from above, so installers never need to work at awkward angles or underneath the deck structure, keeping the job straightforward and efficient.
• Fastener-free deck surface - because no nail or screw heads appear on top, the finished deck looks cleaner, and boards can be removed and replaced during future resurfacing without dealing with face-driven fasteners.
• Polypropylene biscuit construction - formed from long-lasting polypropylene engineered to hold up for the life of the deck, resisting the moisture and movement cycles that cause lesser materials to degrade.
• 316SS stainless-steel #7 trim-head screws included (black head, 6-lobe T-15 drive) - hardware is matched and ready to use straight out of the bucket, with a black finish that stays discreet if any screw head is ever visible at the board edge.
• Coverage sized for real projects - each package includes enough EB-TY fasteners and screws to install 100 square feet of decking, making it easy to calculate how many buckets a project requires before ordering.
• Complete kit with driver bits and starter-board fasteners - includes a T15 driver bit for the trim-head screws, plus ten #10 x 2-3/4 in. DCU 305SS fasteners and a T20 driver bit for securing the starter board, so the full installation process is covered with no separate hardware runs.

Why This Product

• Invisible fastening for a truly finished look - the biscuit-slot method keeps all hardware hidden in the board edge, producing a deck surface free of exposed screw or nail heads that would otherwise interrupt a clean aesthetic on TimberTech installations.
• Self-spacing design saves time on every row - nesting each board directly against the installed EB-TY automatically sets a consistent 3/16 in. gap, eliminating the step of manually measuring or repositioning spacers across every joist.
• Everything needed for installation ships in one bucket - EB-TY fasteners, 316SS trim-head screws, starter-board fasteners, and two driver bits are all included, reducing pre-job sourcing and keeping the installation moving without interruption.
• Built to last the life of the deck - the polypropylene biscuit material is selected for long-term durability, meaning the hidden fastening system stays functional and stable without requiring replacement as the deck ages.

Specifications

• Model No.: 175-EB TT
• Biscuit Model No.: 316-TT
• Material: Polypropylene
• Color: Black
• Decking Thickness: 3/4" to 1 1/2"
• Board Spacing: 3/16"
• Packaging Type: Bucket
• Packaging Qty.: 175
• Country of Origin: United States

Approved Applications

• Decks - Deck Boards Wood (TimberTech decking)

What's Included

• EB-TY fasteners
• 316SS #7 trim head screws
• (1) T15 Driver Bit
• (10) #10 x 2-3/4" DCU 305SS fasteners for securing starter board
• (1) T20 Driver Bit

Frequently Asked Questions

How does the EB-TY hidden deck fastener work?

The EB-TY is a polypropylene biscuit fastener that fits into a slot cut into the edge of each deck board using a standard biscuit joiner. Once inserted, a screw is driven through the biscuit and into the joist from the top side, keeping the deck surface completely free of visible fastener heads. Each successive board is nested against the installed EB-TY, automatically ensuring consistent spacing and uniform height.

How much decking can one package of the 175-EB TT cover?

Each EB-TY package includes enough EB-TY fasteners and screws to install 100 square feet of decking. This bucket contains a quantity of 175 fasteners.

What board spacing does the 175-EB TT provide?

The 175-EB TT automatically creates a consistent 3/16" gap between deck boards. Because each board nests directly against the installed EB-TY fastener, uniform spacing is achieved without the need for manual measuring or spacer tools.

What type of screws are included with the 175-EB TT?

The package includes 316 stainless steel #7 trim head screws with a black head and a 6-lobe T-15 drive, along with a T15 driver bit. Also included are (10) #10 x 2-3/4" DCU 305SS fasteners for securing the starter board and a T20 driver bit.