The Simpson Adhesive Retaining Cap for 1-1/4 in. Rod from Simpson is a plastic cap engineered to make overhead, horizontal, and upwardly inclined anchor installations more reliable by preventing adhesive from running out of the drilled hole. By centering the threaded rod or rebar dowel precisely during insertion, it is especially well-suited for applications where accurate anchor placement is critical - including deep embedments where maintaining proper positioning throughout the cure process is essential. Compatible with any Simpson anchoring adhesive, this cap works seamlessly within the broader Simpson anchor system, including the Piston Plug Delivery System.

Key Features

• Slit-design cap allows insert to pass through while containing adhesive - the rod or rebar seats cleanly into position without disturbing the adhesive charge, reducing waste and ensuring a full, consistent bond in the hole
• Centers the threaded rod or rebar dowel during insertion - keeps the anchor on-axis throughout placement, so installers achieve precise alignment without guesswork or repeated adjustments
• Designed for overhead, upwardly inclined, and horizontal orientations as well as deep embedments - a single cap style covers the most demanding installation angles, reducing the need for multiple accessory types on the job site
• Works with any Simpson anchoring adhesive - broad adhesive compatibility means crews are not locked into a single product formula, giving flexibility across different substrate and environmental conditions

Why This Product

• Solves the adhesive runout problem in non-downward installations - gravity works against overhead and inclined anchor work, and this cap physically retains the adhesive in the hole so the full embedment zone stays loaded and the anchor cures with the strength the design calls for
• Promotes accurate anchor placement in precision-critical applications - by centering the rod or rebar dowel automatically, the cap reduces positional error that could affect load performance or conflict with hardware alignment above the slab or structure
• Integrates with the Simpson Piston Plug Delivery System - pairing the retaining cap with a compatible injection delivery method keeps the entire anchoring process within a coordinated system, supporting consistent results from drilling through cure
• Made in the United States from plastic - a lightweight, durable material choice that holds the adhesive charge without adding meaningful weight or complexity to the installation workflow

Specifications

• Model Number: ARC125-RP25
• Hole Diameter: 1-3/8 in.
• Drill Bit Diameter: 1-3/8 in.
• Bolt/Rod Diameter: 1-1/4 in. / #10 rebar
• Material: Plastic
• Packaging: Packs of 25 and Cartons of 200
• Country of Origin: United States

Approved Applications

• Overhead anchor installations where adhesive retention is required
• Horizontal anchor installations requiring precise rod or dowel centering
• Upwardly inclined anchor installations
• Deep embedment applications where accurate anchor placement is essential
• Use in conjunction with the Simpson Strong-Tie Piston Plug Delivery System

Frequently Asked Questions

What is the purpose of the slit in the Simpson ARC125-RP25 adhesive retaining cap?

The slit in the cap allows the threaded rod or rebar dowel insert to pass through the cap while still containing the adhesive inside the drilled hole, preventing it from running out during installation.

Can the ARC125-RP25 be used to 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 ARC125-RP25?

The ARC125-RP25 works with any Simpson Strong-Tie anchoring adhesive, offering broad compatibility across Simpson Strong-Tie's adhesive anchor product line.

Can the ARC125-RP25 be used with the Simpson Strong-Tie Piston Plug Delivery System?

Yes. Simpson Strong-Tie ARC adhesive retaining caps may be used in conjunction with the Simpson Strong-Tie Piston Plug Delivery System for even more controlled adhesive dispensing during anchor installation.

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 performing overhead anchor installations.