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Square brushed stainless steel electrical box with screw-down clamps and lift-off cover

HOFFMAN

HOFFMAN A404NFSS 304 Stainless Steel Electrical Box 4.0 in H x 4.0 in W x 3.0 in D

SKU CH-E9HG-J5T4S

A 304 stainless steel wall-mount enclosure rated NEMA 12, 3R, 4, 4X and IP66 with screwdown clamps and a brushed finish

  • Product typeElectrical Boxes
  • NEMA 3R, 4, 4X, 12 and IP66 ratings protect against dust, water and corrosion
  • 304 stainless steel construction with brushed finish resists harsh environments and chemical exposure
  • 0 in height by 4.0 in width by 3.0 in depth suits compact wall-mount installations
  • Lift-off cover secured by screwdown clamps with polyurethane gasket ensures reliable sealing
  • CSA certified, cUL, IEC and UL listed for code-compliant electrical applications

NEMA 3R 4 4X 12 enclosure

The HOFFMAN A404NFSS is a wall-mount electrical box built from 304 stainless steel with a brushed finish. It carries NEMA 3R, 4, 4X and 12 ratings plus IP66 for protection against dust, water and corrosion. The solid cover uses screwdown clamps and a polyurethane gasket to maintain the seal. Weld nuts are provided for mounting a panel and terminals.

Indoor outdoor thermal performance

The 14/16 gauge stainless steel construction resists heat buildup and environmental stress without active cooling. No fans or vents are present so operation is silent in normal use. The enclosure draws no power itself and adds negligible thermal load to the installation. Its solid cover and gasket preserve the rated ingress protection across temperature cycles.

Series A51S wall mount fit

The box measures 4.0 in high by 4.0 in wide by 3.0 in deep and uses wall-mounting brackets integrated into the body. The lift-off cover with screwdown clamps allows quick access while keeping the enclosure sealed when closed. Internal weld nuts accept a mounting panel and terminal blocks without extra hardware. CSA, cUL, IEC and UL listings support code-compliant installations.

How it compares

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

Price $245.99
Pricier than about 90% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameHoffman
Product typeElectrical Boxes

Questions about this item

How is the Hoffman A404NFSS mounted to the wall and what step is often missed?

Use the welded nuts inside the 4.0 in H x 4.0 in W enclosure to secure a mounting panel, then fasten the box to the wall through the back; the missed step is torquing the screwdown clamps evenly to compress the polyurethane gasket for the IP66 seal.

What maintenance does the 304 stainless steel box with polyurethane gasket require over time?

Inspect the polyurethane gasket periodically for compression set or chemical damage, clean the brushed finish with non-abrasive stainless cleaner, and verify the screwdown clamps remain tight to maintain the NEMA 4X and IP66 ratings.

What is the first limitation reached when the enclosure operates continuously in a hot, wet environment?

The polyurethane gasket will degrade before the 304 stainless steel body, limiting the sustained NEMA 4X and IP66 ingress protection in prolonged high-temperature wash-down or UV exposure.

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