The Simpson Strong-Tie 21-in. Steel Epoxy-Adhesive Screen Tube for 3/4-in. Rod is a precision-engineered carbon steel screen tube built for hollow base material anchoring applications. Constructed from 60 mesh carbon steel, it contains adhesive around the anchor and prevents it from running into voids, delivering thorough coating and bonding of the threaded rod to the screen tube and surrounding base material. Designed exclusively for use with Simpson Strong-Tie ET-3G epoxy adhesive, this screen tube precisely controls the amount of adhesive that passes through the mesh for consistent, reliable anchor performance every time.

Key Features

• 60 mesh carbon steel construction - precisely meters adhesive flow through the mesh, ensuring complete, uniform coating of the rod and a strong bond to the base material
• Designed exclusively for ET-3G epoxy adhesive formulations - compatibility is matched to a specific adhesive type, so the mesh controls adhesive dispersion as intended and protects installation integrity
• Sized for 3/4-in. rod diameter in a 1-in. hole - fits the correct anchoring geometry straight out of the package, eliminating guesswork on hollow base material installations
• 21-in. length - accommodates deeper embedment requirements, giving contractors flexibility for demanding structural anchoring applications
• Prevents adhesive from running into voids - keeps epoxy contained around the anchor in hollow substrates, reducing waste and ensuring the bond forms exactly where it is needed

Why This Product

• Purpose-built for hollow base material anchoring - unlike open-hole installations, hollow substrates require a physical barrier to contain adhesive; this screen tube is specifically engineered to solve that problem, making it a reliable solution for anchoring threaded rod into block, brick, or similar materials
• Adhesive-specific mesh design protects bond quality - because screen tubes are designed for a specific adhesive type, using this epoxy screen tube with Simpson Strong-Tie ET-3G means the mesh porosity is calibrated to that formula, producing thorough rod-to-substrate bonding rather than inconsistent coverage
• Matched geometry simplifies installation - with dimensions engineered for 3/4-in. rod and a 1-in. hole, this screen tube integrates directly into a standard hollow base material anchor setup without modification or adaptation
• Part of a complete Simpson Strong-Tie dispensing system - designed to work alongside Simpson Strong-Tie manual and pneumatic dispensing tools and accessories, this screen tube fits into an established, compatible product ecosystem for efficient adhesive anchor installations

Specifications

• MPN: ETS7521
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Finish: Carbon Steel
• Bolt/Rod Diameter (in.): 3/4
• Outside Diameter (in.): 31/32
• Length (in.): 21
• Hole Size (in.): 1
• Install With: For use with Simpson Strong-Tie ET-3G epoxy adhesive
• Packaging: Packs of 1 and Cartons of 25

Approved Applications

• Hollow base material anchoring applications where adhesive must be contained around the anchor
• Applications requiring prevention of adhesive from running into voids within the base material
• Threaded rod installations with 3/4-in. rod diameter in 1-in. holes

Frequently Asked Questions

What adhesive must be used with the ETS7521 screen tube?

The ETS7521 epoxy screen tube must be used exclusively with Simpson Strong-Tie ET-3G epoxy adhesive formulations. Screen tubes are designed for a specific adhesive type, and using a different adhesive may result in improper performance.

What rod diameter is the ETS7521 compatible with?

The ETS7521 is designed for use with a 3/4-in. rod diameter. The required hole size for installation is 1 in., and the outside diameter of the screen tube itself is 31/32 in.

Why are screen tubes used in hollow base material applications?

Screen tubes are used in hollow base material applications to contain adhesive around the anchor and prevent it from running into voids. The 60 mesh carbon steel construction of the ETS7521 precisely controls the amount of adhesive that passes through, resulting in thorough coating and bonding of the rod to the screen tube and base material.

What is the length of the ETS7521 screen tube?

The ETS7521 screen tube has a length of 21 in., making it suitable for deeper embedment anchoring applications requiring full adhesive coverage along the rod length.