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Round brass floor sub-plate, single gang, new condition

Steel City

Steel City 693-SC Floor Sub-Plate 1 Gang Brass

SKU CH-Y9EP-9NYDN

Single-gang brass floor sub-plate model 693-SC for use with P64 floor plate covers

  • Product typeElectrical Boxes & Covers
  • Brass construction resists corrosion for long service life
  • Single-gang round plate fits P64 floor box covers
  • 1-1/4 inch conduit size matches standard floor installations
  • TSCA compliance confirms regulated material safety
  • New condition ensures clean, undamaged installation surface

Floor Sub-Plate for Single-Gang Boxes

The Steel City 693-SC is a brass floor sub-plate designed for single-gang floor box installations. It provides a secure mounting surface for P64 floor plate covers in commercial or residential electrical projects. Electricians and builders use it when a durable, round floor opening is required for power or data access.

Capacity and headroom for one gang

This sub-plate accommodates exactly one gang opening with a 1 1/4 inch conduit size, matching standard floor box rough-in dimensions. It handles typical branch-circuit wiring for outlets or low-voltage devices in that single compartment. Projects needing multiple gangs or larger conduit entries will require a different floor box assembly.

Brass construction and cover compatibility

The brass material resists corrosion and wear in floor environments where moisture or cleaning agents are present. Its round shape and precise fit ensure P64 covers sit flush, reducing trip hazards and maintaining a clean appearance. The sub-plate mounts directly to the floor box body, simplifying installation and future cover replacement.

How it compares

Measured against everything we stock in Electrical Enclosures & Cabinets, at today’s prices. Recalculated every night.

Price $53.99
Pricier than about 59% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameSTEEL CITY
Product typeElectrical Boxes & Covers

Questions about this item

Will this 693-SC brass sub-plate fit the P64 floor plate covers I already have installed?

Yes — it is made for use with P64 floor plate covers, so your existing covers will match.

How can I confirm the sub-plate is seated correctly once installed?

The round brass plate should sit flush with the finished floor and the 1 1/4 in conduit opening lines up with the box below.

Does the package include mounting screws or a P64 cover, or must I buy them separately?

Only the brass sub-plate is supplied; screws and the P64 cover are sold separately.

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