Middle Atlantic Afterset Insert EXT 1IN H - 424-1

Middle Atlantic 424-1 Afterset Insert Extension for 525-Series In-Floor Systems

Overview

The Middle Atlantic 424-1 is a 1-inch (25.4 mm) IPS extension fitting designed for use with 525-series afterset inserts in in-floor raceway and service-fitting installations. If you're finishing an in-floor cable management run and need to extend an afterset insert to flush with a raised floor or surface depth that the standard insert height doesn't reach, the 424-1 is the part that closes that gap. It's a purpose-built mechanical component — not a universal adapter — so confirming compatibility with your specific 525-series afterset insert and floor assembly is the first step before ordering.

TAA compliance is confirmed for the 424-1, which matters for federal, state, and municipal installations subject to Trade Agreements Act procurement rules. If your project specs call for TAA-compliant components throughout the cable management pathway, this fitting qualifies.

Compatibility

The 424-1 is designed for use within the Middle Atlantic 525-series in-floor service fitting ecosystem. It is not a standalone unit — it extends an existing afterset insert to accommodate installation depth requirements. Verify your existing insert model and floor thickness before ordering. For broader cable management accessories and in-floor raceway components, confirm the full assembly stack matches your floor system's specifications.

Installation Notes

Installation is mechanical: the 424-1 threads or seats into the afterset insert per the 525-series assembly instructions. The 1-inch diameter (25.4 mm) is fixed — no field modification. If your floor system requires a different diameter or a different extension height, consult the full 525-series fitting lineup for the correct variant. For large structured cabling projects with multiple in-floor service points, ordering the correct extension at the planning stage avoids rework after floor finishing.

Frequently Asked Questions

Q: Is the Middle Atlantic 424-1 TAA compliant?

A: Yes. The 424-1 is confirmed TAA compliant, making it suitable for government and federally funded projects that require Trade Agreements Act compliance throughout the installation.

Q: What is the diameter of the 424-1?

A: The 424-1 has a diameter of 1 inch (25.4 mm). This is a fixed dimension — the fitting is not adjustable.

Q: What series does the 424-1 work with?

A: The 424-1 is designed for the Middle Atlantic 525-series in-floor service fitting system, specifically as an extension for afterset inserts. Confirm your existing insert model is part of this series before ordering.

Q: Can the 424-1 be used as a standalone fitting?

A: No. The 424-1 is an extension component that works in conjunction with a 525-series afterset insert. It does not function as a standalone floor fitting.

Q: Is the 424-1 (also searched as 424 1) suitable for raised-floor environments?

A: The 424-1 is intended to extend afterset inserts to match installation depth requirements, which commonly arises in raised-floor environments. Verify the extension height matches your floor assembly before specifying.

Jerry Tildsen

The Middle Atlantic 424-1 is one of those parts that shows up on a punchlist when a flush in-floor finish matters — specifically, when the standard afterset insert height doesn't quite reach the finished floor surface and you need a 1-inch diameter IPS extension to close it out cleanly. It's not glamorous, but specifying the wrong extension height or diameter on a multi-point in-floor run creates rework after tile or raised flooring is in place, which is far more expensive than getting the 424-1 on the original BOM.

Technical Highlights:

• 1-Inch (25.4 mm) Fixed Diameter: Matches the 525-series afterset insert bore — no field cutting or adapting required. Confirm your insert model before ordering; the diameter is not adjustable.
• TAA Compliant: Verified for the 424-1, which satisfies procurement requirements on GSA schedules, federal construction projects, and state-funded installations where TAA compliance is mandated throughout the cable management pathway — not just the active electronics.
• 525-Series Ecosystem Fit: Designed as a purpose-built extension within Middle Atlantic's in-floor service fitting family, not a generic IPS fitting. Cross-referencing the full 525-series lineup ensures the extension height, insert model, and floor cover all align before the floor is finished.

Deployment Considerations:

• Order the 424-1 at the design stage, not after floor finishing. Depth mismatch between the afterset insert and finished floor surface is the most common reason this part gets expedited — and expedited mechanical fittings on a government job with TAA requirements can stall closeout.
• The 424-1 is not a universal IPS extension. Verify the mating afterset insert is a 525-series Middle Atlantic component before specifying; mismatched inserts won't seat correctly regardless of diameter match.

The 424-1 is the right call on government facility AV and security infrastructure builds where in-floor service points need a TAA-compliant, properly dimensioned extension to finish flush — particularly in control rooms, operations centers, and federal office fit-outs where both compliance documentation and clean finish work are non-negotiable.