The Simpson Adhesive Retaining Cap for 7/8 in. Rod (ARC87) by Simpson is engineered to make overhead, upwardly inclined, and horizontal adhesive anchor installations more reliable by preventing adhesive from running out of the drilled hole during the curing process. A built-in centering function keeps the threaded rod or rebar dowel precisely aligned during insertion, making this plastic cap a practical solution for any application where accurate anchor placement is critical - including deep embedment work where consistency matters most.

Key Features

• Slit design allows the anchor to pass through while containing adhesive in the hole - keeps adhesive where it belongs, reducing waste and ensuring a full, consistent bond around the anchor.
• Centers the threaded rod or rebar dowel during insertion - eliminates guesswork and maintains precise anchor alignment, which is especially important in structural and load-bearing applications.
• Designed for overhead, upwardly inclined, horizontal orientations, and deep embedments - a single cap handles the most demanding installation angles, reducing the need for multiple accessory types on the job site.
• Compatible with any Simpson anchoring adhesive - works seamlessly across the full Simpson adhesive anchor product line, so there is no need to match caps to a specific adhesive formula.
• Compatible with the Simpson Piston Plug Delivery System - integrates with existing injection equipment for a complete, controlled adhesive anchor workflow.

Why This Product

• Solves the most common overhead anchoring problem - adhesive runout during overhead and inclined installations is a leading cause of incomplete bonds; the retaining cap contains the adhesive in the hole so the anchor cures with full coverage.
• Promotes precise, consistent anchor placement - the centering function removes variability from rod and rebar dowel insertion, which is critical in applications where anchor position directly affects structural performance.
• Broad installation versatility in one accessory - rated for overhead, upwardly inclined, horizontal, and deep embedment work, this cap covers virtually every adhesive anchor orientation without requiring a different product for each job condition.
• Trusted Simpson quality, made in the United States - backed by the engineering standards Simpson is known for, providing confidence that the cap will perform consistently across professional anchoring applications.

Specifications

• Manufacturer Part Number (MPN): ARC87-RP25
• Brand: Simpson Strong-Tie
• Hole Diameter: 1 in.
• Drill Bit Diameter: 1 in.
• Bolt/Rod Diameter: 7/8 in. anchor or #7 rebar
• Material: Plastic
• Packaging: Packs of 25 and Cartons of 200
• Country of Origin: United States

Approved Applications

• Overhead anchor installations requiring adhesive containment
• Upwardly inclined anchor installations
• Horizontal adhesive anchor installations
• Deep embedment applications
• Applications requiring precise centering of threaded rod or rebar dowels in drilled holes
• Use in conjunction with the Simpson Strong-Tie Piston Plug Delivery System

Frequently Asked Questions

What rod and rebar sizes are compatible with the ARC87-RP25 adhesive retaining cap?

The ARC87-RP25 is designed for use with 7/8 in. diameter threaded anchors and #7 rebar. It requires a 1 in. hole diameter drilled with a 1 in. drill bit.

Can the ARC87-RP25 support the weight of the anchor during an overhead installation?

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 anchoring adhesives are compatible with these retaining caps?

The ARC87-RP25 works with any Simpson Strong-Tie anchoring adhesive, offering broad compatibility across the Simpson Strong-Tie adhesive anchor product line.

How does the ARC87-RP25 prevent adhesive from running out of the hole during installation?

The cap is inserted into the drilled hole and features a slit that allows the threaded rod or rebar to pass through while containing the adhesive within the hole. This design is especially effective in overhead, upwardly inclined, and horizontal orientations where adhesive runout is a concern.

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.