Simpson Adhesive Retaining Caps for 3/4 in. Rod and #6 Rebar are plastic anchoring accessories from Simpson engineered to make overhead, horizontal, and upwardly inclined anchor installations more reliable by preventing adhesive from running out of the drilled hole. The slitted cap design holds the adhesive in place while allowing the threaded rod or rebar dowel to pass through cleanly, and the cap geometry automatically centers the insert within a 7/8 in. diameter hole - making these retaining caps especially valuable where precise anchor placement is critical.

Key Features

• Slit-through cap design contains adhesive in the hole - the opening allows the threaded rod or rebar to pass through while keeping adhesive properly seated, preventing waste and ensuring a full bond zone around the anchor.
• Built-in rod-centering geometry - the cap automatically centers a 3/4 in. threaded rod or #6 rebar within the 7/8 in. drilled hole, reducing the risk of off-center placement that could compromise load performance.
• Rated for overhead, upwardly inclined, horizontal, and deep embedment applications - gives installers a single accessory that addresses the most demanding anchoring orientations without substitution or guesswork.
• Compatible with any Simpson anchoring adhesive - works across the full Simpson adhesive lineup, so there is no need to source a separate retaining cap for different adhesive systems on the same job.
• Supports use with the Simpson Piston Plug Delivery System - integrates with an established injection method, keeping your anchoring workflow consistent and efficient.

Why This Product

• Solves the most common overhead anchoring problem - adhesive runout in overhead and upwardly inclined holes is a leading cause of installation failure; the retaining cap physically contains the adhesive so it stays where it needs to be during cure.
• Precision placement without extra steps - because the cap centers the rod or rebar automatically, installers achieve consistent anchor alignment on every hole without additional tooling or manual adjustment.
• Broad orientation and application coverage - designed specifically for overhead, horizontal, upwardly inclined, and deep embedment conditions, these caps reduce the need to stock multiple accessories for different anchoring scenarios.
• Seamless compatibility across the Simpson adhesive system - whether the project calls for a standard adhesive or a specialty formulation, these caps work with any Simpson anchoring adhesive, keeping procurement simple and the installation process consistent.

Specifications

• Model Number: ARC75-RP25
• Hole Diameter: 7/8 in.
• Drill Bit Diameter: 7/8 in.
• Bolt/Rod Diameter: 3/4 in., #6
• Material: Plastic
• Packaging: Packs of 25 and Cartons of 200
• Country of Origin: United States

Approved Applications

• Overhead anchor installations where adhesive containment is critical
• Horizontal adhesive anchor installations
• Upwardly inclined anchor installations
• Deep embedment applications requiring precise rod or rebar placement
• Installations using the Simpson Strong-Tie Piston Plug Delivery System

Frequently Asked Questions

Can adhesive retaining caps 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 cure time.

Which adhesives are compatible with the ARC75-RP25 retaining cap?

The ARC75-RP25 works with any Simpson Strong-Tie anchoring adhesive, making it a versatile accessory across a wide range of anchoring projects.

How does the cap keep the rod centered in the hole?

The cap is sized specifically for a 7/8 in. hole diameter and a 3/4 in. anchor or #6 rebar, so when the rod or rebar is inserted through the slit in the cap, the cap geometry naturally centers it within the drilled hole for precise placement.

Can the ARC75-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 for streamlined adhesive anchor installations.

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.