Simpson Strong-Tie Opti-Mesh 3-1/2 in. Epoxy Adhesive Plastic Screen Tube for 3/8 in. Rod (Model EWS373P) is engineered specifically for use with the ET-3G epoxy adhesive formulation and is an essential accessory for achieving reliable adhesive anchor performance in hollow or void-containing base materials such as hollow block and brick. Simpson Strong-Tie's Opti-Mesh design features a woven mesh insert that delivers the economical advantages of a plastic screen tube while providing superior performance over both steel screen tubes and competitive plastic screen tubes.

Key Features

• Integral cap centers the rod and displays drill bit and rod diameter
• Flanges prevent the screen tube from slipping into over-drilled holes
• Formula-specific woven mesh design controls flow of adhesive out of the screen
• Uniform coverage of adhesive on the rod results in higher loads than for rods installed with standard screen
• Open-mesh collar allows extra adhesive flow in hollow block applications
• Caution: Screen tubes are designed for a specific adhesive type; epoxy screen tubes must be used with ET-3G formulation

Specifications

• Model Number (MPN): EWS373P
• Brand: Simpson Strong-Tie
• Compatible Adhesive: ET-3G (Epoxy)
• Bolt/Rod Diameter: 3/8 in.
• Hole Size: 9/16 in.
• Length: 3-1/2 in.
• Material: Plastic
• Packaging: Packs of 1 and Cartons of 150
• Country of Origin: United States

Approved Applications

• Adhesive anchoring in hollow block base materials
• Adhesive anchoring in brick and other base materials containing voids
• Use with Simpson Strong-Tie ET-3G epoxy adhesive formulation only
• For use with 3/8 in. diameter threaded rod in a 9/16 in. drilled hole

Frequently Asked Questions

Which adhesive formulation must be used with the EWS373P screen tube?

The EWS373P Opti-Mesh screen tube is designed specifically for use with the Simpson Strong-Tie ET-3G epoxy adhesive formulation. Screen tubes are formula-specific, and epoxy screen tubes must only be used with ET-3G. Using an incompatible adhesive type may compromise anchor performance.

What rod diameter and hole size is this screen tube designed for?

This screen tube is designed for a 3/8 in. diameter rod installed in a 9/16 in. drilled hole. The integral cap on the screen tube displays both the drill bit and rod diameter to help ensure correct installation.

Why are screen tubes necessary when using adhesive anchors in hollow block or brick?

Screen tubes are vital to the performance of adhesive anchors in base materials that are hollow or contain voids, such as hollow block and brick. The Opti-Mesh woven mesh design controls the flow of adhesive out of the screen, ensuring uniform coverage on the rod, which results in higher loads compared to rods installed with a standard screen.

How does the Opti-Mesh design prevent installation errors in over-drilled holes?

The EWS373P features flanges that prevent the screen tube from slipping into over-drilled holes, helping to maintain proper positioning of the adhesive and rod during installation. The integral cap further aids correct placement by centering the rod within the hole.

Note: Product dimensions may differ from picture. Please refer to the specifications listed above for exact dimensions.