Simpson ARC50-RP25 Adhesive Retaining Cap for 5/8 in. Hole Diameter is a precision-engineered plastic anchor accessory from Simpson Strong-Tie designed to make overhead and horizontal adhesive anchor installations cleaner and more accurate. By sealing the mouth of a drilled hole, this retaining cap prevents anchoring adhesive from running out during rod or rebar dowel insertion, ensuring full embedment and consistent adhesive coverage - especially critical in overhead, upwardly inclined, and deep-embedment applications where adhesive containment directly affects holding performance.

Key Features

• The slit in the cap allows the insert to pass through while containing the adhesive in the hole
• The cap centers the threaded rod or rebar dowel during insertion into the drilled hole
• Designed for overhead, upwardly inclined and horizontal orientations as well as deep embedments
• Works with any Simpson Strong-Tie anchoring adhesive
• Hole diameter: 5/8 in.
• Drill bit diameter: 5/8 in.
• For 1/2 in. anchor or #4 rebar size

Specifications

• Manufacturer Part Number (MPN): ARC50-RP25
• Brand: Simpson Strong-Tie
• Hole Diameter: 5/8 in.
• Drill Bit Diameter: 5/8 in.
• Bolt/Rod Diameter: 1/2 in. / #4 rebar
• Material: Plastic
• Packaging: Packs of 25 and Cartons of 200
• Country of Origin: United States

Approved Applications

• Overhead adhesive anchor installations where adhesive containment is required
• Horizontal adhesive anchor installations
• Upwardly inclined anchor orientations
• Deep embedment applications requiring precise anchor placement
• Applications using the Simpson Strong-Tie Piston Plug Delivery System
• Installations with 1/2 in. threaded rod anchors or #4 rebar dowels

Frequently Asked Questions

What is the purpose of the slit in the Simpson ARC50 adhesive retaining cap?

The slit in the cap is specifically designed to allow the threaded rod or rebar dowel to pass through during insertion while simultaneously containing the anchoring adhesive inside the drilled hole. This ensures the adhesive stays in place rather than running out, which is especially important in overhead and horizontal installations.

Can the ARC50 retaining cap support the weight of the anchor during overhead installations?

No. 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 the adhesive cure time to ensure a safe and proper installation.

Which anchoring adhesives are compatible with the Simpson ARC50-RP25 retaining cap?

The ARC50-RP25 works with any Simpson Strong-Tie anchoring adhesive, offering broad compatibility across the Simpson Strong-Tie adhesive anchor product line. It may also be used in conjunction with the Simpson Strong-Tie Piston Plug Delivery System.

What anchor and hole sizes is the ARC50-RP25 designed to fit?

The ARC50-RP25 is designed for use with a 5/8 in. drilled hole diameter (requiring a 5/8 in. drill bit) and is sized for a 1/2 in. threaded rod anchor or a #4 rebar dowel. The cap centers the rod or rebar within the hole to ensure precise anchor placement.

Note: Adhesive retaining caps are not designed to support the weight of the anchor in overhead installations. In overhead applications, provide an adequate means of anchor support during cure time.