The Simpson Adhesive Retaining Cap for 1-3/4 in. Hole Diameter from Simpson is engineered to make overhead, upwardly inclined, and horizontal anchor installations more reliable by preventing adhesive from running out of the drilled hole during cure. A precision-slit plastic cap fits over the hole opening, allowing the threaded rod or rebar dowel to pass through while keeping the adhesive fully contained inside - a critical advantage in non-vertical installations and deep embedment applications where adhesive loss can compromise anchor integrity. The cap simultaneously centers the rod or rebar dowel during insertion, making it well suited for applications where precise anchor placement is required. Compatible with any Simpson anchoring adhesive and the Simpson Piston Plug Delivery System, this retaining cap is a practical addition to any adhesive anchoring workflow.

Key Features

• Slit-design cap retains adhesive in the hole - allows the threaded rod or rebar dowel to pass through cleanly while preventing adhesive from running out, protecting bond integrity throughout the cure period.
• Centers the rod or rebar dowel during insertion - ensures consistent, precise anchor placement in every hole, reducing installation errors and rework on critical structural applications.
• Designed for overhead, upwardly inclined, and horizontal orientations as well as deep embedments - gives crews a single cap solution that handles the most demanding installation angles where adhesive containment is hardest to maintain.
• Works with any Simpson anchoring adhesive - eliminates compatibility guesswork, letting installers use whichever Simpson adhesive the project calls for without needing a different retaining cap.
• Compatible with the Simpson Piston Plug Delivery System - integrates smoothly into an established adhesive injection workflow, keeping the installation process efficient and consistent.

Why This Product

• Solves the core challenge of non-vertical adhesive anchoring - by physically containing adhesive in the hole during overhead and horizontal installations, this cap addresses the most common cause of incomplete adhesive fills, helping ensure the anchor performs as intended after cure.
• Doubles as a centering tool - unlike a basic plug or cap, the ARC137 actively centers the insert in the drilled hole, making it valuable not just for adhesive retention but for applications where off-center placement would be unacceptable.
• Broad orientation compatibility in one product - rated for overhead, upwardly inclined, horizontal, and deep embedment use, this cap covers a wide range of field conditions without requiring installers to stock multiple SKUs for different angles.
• Made from plastic with a simple slit-through design - the straightforward mechanism requires no special tools or extra steps, keeping installation fast while still providing the adhesive containment and rod-centering control that precise anchor work demands.

Specifications

• Model No.: ARC137-RP25
• Hole Diameter (in.): 1-3/4
• Drill Bit Diameter (in.): 1-3/4
• Anchor Diameter / Rebar Size: #11
• Cap Depth (in.): 11/16
• Material: Plastic
• Packaging: Packs of 25 and Cartons of 200
• Country of Origin: United States

Approved Applications

• Overhead anchor installations where adhesive must be retained in the hole during cure
• Horizontal anchor installations requiring adhesive containment
• Upwardly inclined anchor installations
• Deep embedment applications requiring centered rod or rebar dowel placement
• Applications requiring precise anchor placement where centering of the insert is critical
• Compatible for use in conjunction with the Simpson Strong-Tie Piston Plug Delivery System

Frequently Asked Questions

How does the ARC137-RP25 prevent adhesive from running out of the hole?

The cap fits over the drilled hole and contains the adhesive inside. The slit in the cap allows the threaded rod or rebar dowel to pass through while keeping the adhesive retained within the hole, preventing it from running out during overhead, upwardly inclined, and horizontal installations.

Can the adhesive retaining cap support the weight of the anchor during an overhead installation?

No. Adhesive retaining caps are not designed to support the weight of the anchor. For overhead installations, it is advisable to provide an adequate means of anchor support during cure time.

Which anchoring adhesives are compatible with the ARC137-RP25?

The ARC137-RP25 works with any Simpson Strong-Tie anchoring adhesive, offering broad compatibility across Simpson Strong-Tie's adhesive anchor product line.

Can the ARC137-RP25 be used with the Simpson Strong-Tie Piston Plug Delivery System?

Yes. ARC retaining caps may be used in conjunction with the Simpson Strong-Tie Piston Plug Delivery System, making them a versatile component within a complete adhesive anchor installation setup.

Note: Adhesive retaining caps are not designed to support the weight of the anchor in overhead installations. It is advisable to provide an adequate means of anchor support during cure time when installing in overhead orientations.