The Simpson EB-TY Premium Hidden Deck-Fastening System is an award-winning solution engineered to keep wood deck boards firmly in place while keeping every fastener completely out of sight. Simpson has redesigned the original EB-TY system by integrating a Type 300 series stainless-steel reinforcing plate directly into the polypropylene biscuit, adding the stiffness needed to hold boards securely while still allowing the natural movement that comes with seasonal expansion and contraction. Paired with the included EB-GUIDE predrilling tool and a complete hardware kit, this system gives deck builders and DIYers a clean, professional-looking result without exposed screw heads cluttering the finished surface.

Key Features

• Patented EB-GUIDE predrill guide provides precise fastener angle alignment - takes the guesswork out of biscuit placement so every fastener is set at a consistent angle, reducing installation errors and speeding up the job.
• Stainless-steel reinforced biscuit with increased pullover resistance - the integrated metal plate adds structural stiffness so boards stay locked down over time, even under heavy foot traffic or load.
• Underside keel for consistent fastener positioning - registers the biscuit in the board groove automatically, so spacing stays uniform across the entire deck without constant measuring.
• Radius sides and chamfered edges - guide the biscuit into the groove with less effort, letting installers work faster without forcing or adjusting each piece individually.
• Type 305 stainless-steel trim-head, 6-lobe screws with black-painted heads - blend in with the EB-TY biscuit for a fully concealed finish, while the 6-lobe drive pattern reduces cam-outs and stripped fasteners during installation.
• 3/32 in. board spacing built into the system design - delivers consistent, code-friendly gap spacing for drainage and airflow without using separate spacers or tools.
• Kit includes biscuits, screws, Ipe plugs, EB-GUIDE tool, drill bit, and driver bit - everything required is in one box, so there are no separate trips for tooling or hardware to get started.
• Designed for 3/4 in. or greater wood decking with moisture content greater than air dry (approx. 19%) - sized and engineered for the natural expansion behavior of fresh-milled and pressure-treated lumber, reducing the risk of buckling or gapping as boards dry in place.

Why This Product

• A truly complete hidden fastening system in one kit - unlike basic biscuit-only packs, this kit bundles the EB-GUIDE predrilling tool, a quick-release impact-ready drill bit, a T-15 6-lobe driver bit, Ipe wood plugs for first and last board installations, and all required screws, so professional results are achievable right out of the box with no additional purchases.
• Engineered strength that handles seasonal wood movement - the stainless-steel reinforcing plate inside each polypropylene biscuit is specifically designed to hold boards firmly while still flexing with natural expansion and contraction, protecting the deck surface from buckling, warping, or gaps opening over time.
• Invisible finish that elevates the look of any wood deck or boardwalk - because all fasteners are hidden between boards, the finished deck surface shows only clean, uninterrupted wood grain, making this system well suited for high-visibility residential decks, docks, and boardwalk applications.
• Precision tools built into the system reduce installation time and mistakes - the patented EB-GUIDE tool locks in the correct drill angle every time, the underside keel registers the biscuit automatically, and the chamfered edges guide each piece into place quickly, so installers spend less time correcting errors and more time moving down the deck.

Specifications

• Manufacturer Part Number (MPN): EB332WDR175
• Biscuit Model Number: EB332W
• Brand: Simpson Strong-Tie
• Material: Polypropylene
• Installs With: Type 305 stainless-steel screw, included
• Screw Size: #7 x 2-1/4 in.
• Screw Type: Type 305 stainless-steel trim-head, 6-lobe with black-painted heads
• Decking Thickness: 3/4 in.
• Board Spacing Requirement: 3/32 in.
• Recommended Wood Moisture Content: Greater than air dry (approx. 19%) for 3/4 in. or greater wood
• Quantity (Biscuits): 175
• Country of Origin: United States

Approved Applications

• Decks - Deck Boards (Wood)
• Hidden deck fastening for 3/4 in. or greater wood decking boards
• Wood decking with moisture content greater than air dry (approx. 19%)

What's Included

Each EB332WDR175 kit contains everything required for installation right out of the box:

• (175) EB-TY Premium biscuits (Model EB332W)
• (190) Type 305 stainless-steel trim-head, 6-lobe screws with black-painted heads
• (12) Ipê wood plugs for first and last board installations
• (1) EB-GUIDE predr

Frequently Asked Questions

What is included in this kit?

This kit includes 175 EB-TY Premium biscuits, 190 Type 305 stainless-steel trim-head screws, 12 Ipê wood plugs for first and last board installations, one EB-GUIDE predrilling tool, one 1/8 in. quick-release impact-ready drill bit, and one T-15 6-lobe driver bit.

What decking thickness and wood moisture content is this fastener system designed for?

The EB-TY Premium system is designed for decking that is 3/4 in. thick or greater, and it is intended for use with wood that has a moisture content greater than air dry, which is approximately 19% or higher.

What board spacing does this system create between deck boards?

The EB-TY Premium biscuits are designed to maintain a consistent spacing requirement of 3/32 in. between deck boards. The underside keel on each biscuit helps ensure this consistent positioning across every board during installation.

How does the redesigned EB-TY Premium biscuit differ from earlier versions?

Simpson Strong-Tie redesigned the EB-TY system by integrating a Type 300 series stainless-steel reinforcing plate directly into the polypropylene biscuit. This plate adds stiffness to hold boards in place securely while still maintaining flexibility to accommodate seasonal contraction and expansion. The biscuits also feature radius sides and chamfered edges for easier alignment and faster installation.