Milbank 666-SC1-NK-NP NEMA 1 U...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.36
Milbank 666-SC1-NK-NP NEMA 1 Unflanged Screw Cover Junction Box, Galvanized Steel, 6-Inch x 6-Inch x 6-Inch

Milbank 666-SC1-NK-NP NEMA 1 Unflanged Screw Cover Junction Box, Galvanized Steel, 6-Inch x 6-Inch x 6-Inch

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Model: 666-SC1-NK-NP

In Stock (leaves warehouse same day if ordered before 3pm ET)

$16.36
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Milbank 666-SC1-NK-NP NEMA 1 Unflanged Screw Cover Junction Box, Galvanized Steel, 6-Inch x 6-Inch x 6-Inch

The Milbank 666-SC1-NK-NP is a NEMA 1 rated, unflanged screw cover junction box constructed from unpainted G90 galvanized steel. Sized at 6-Inch x 6-Inch x 6-Inch, this enclosure is designed to house, protect, and organize electrical wiring connections in indoor commercial and industrial settings. The box ships without knockouts, giving electrical contractors full control over conduit entry placement, and its screw-mounted cover keeps the enclosure secure while remaining easy to open for inspection, splicing, or maintenance work.

Key Features

  • Trade Size: 6-Inch x 6-Inch x 6-Inch overall dimensions provide ample interior space for wire splices, taps, and junction connections.
  • Durable Construction: Unpainted G90 galvanized steel body offers strong corrosion resistance and a rugged, long-lasting enclosure for demanding job-site conditions.
  • Unflanged Design: The unflanged body profile allows for a clean, low-profile installation against walls, panels, or equipment surfaces.
  • Screw Cover Access: A screw-secured cover keeps the enclosure closed during normal operation while allowing quick, tool-based access for wiring changes or troubleshooting.
  • Without Knockout: Supplied without pre-punched knockouts so installers can field-drill conduit openings exactly where required for the application, reducing wasted openings and improving enclosure integrity.
  • NEMA 1 Rating: Rated NEMA 1 for indoor use, protecting enclosed conductors and terminations against dust, dirt, and incidental contact.

Certifications & Compliance

  • NEMA 1 Rated Enclosure

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Indoor Electrical Wiring Junctions and Splice Points
  • Commercial and Industrial Electrical Installations
  • Conduit and Raceway Systems Requiring Field-Drilled Entries
  • Panelboard and Load Center Wiring Junctions
  • New Construction and Electrical Renovation Projects

Why Milbank?

Milbank fabricates this junction box from unpainted G90 galvanized steel, delivering the corrosion resistance and structural durability electrical contractors rely on for long-term performance. The unflanged, screw-cover design combined with a NEMA 1 rating makes this enclosure a dependable choice for protecting wiring connections in indoor commercial and industrial environments. Choose Milbank for galvanized steel junction boxes built for reliable, code-compliant electrical installations.

Manufacturer Resources

Product Specs

list_batch:
MIL-20260917
Product Type:
Junction Box
Configuration:
Unflanged Screw Cover
Product Finish:
Unpainted G90 Galvanized
Standards:
NEMA 1
Department:
Electrical
Product Subgroup:
Electrical Boxes
Product Material:
Galvanized Steel
Product Size:
6-Inch x 6-Inch x 6-Inch
Product Group:
Boxes & Enclosures
Product Height:
6 in
Product Color:
Unpainted
Product Width:
6 in
Product Length:
6 in

Milbank 666-SC1-NK-NP – Frequently Asked Questions

1) Can the Milbank 666-SC1-NK-NP junction box be used outdoors or in a washdown area?
No. The 666-SC1-NK-NP is a NEMA 1 enclosure, which covers indoor use only, protecting conductors and terminations from dust, dirt and incidental contact. It is not rated against rain, hose-down or corrosive wet environments. For an outdoor or washdown location, the Rittal 80181 JB Series hinged-cover junction box is rated IP66/NEMA 4X.
2) Does the Milbank 666-SC1-NK-NP come with knockouts for conduit?
It ships with no knockouts at all. The installer field-drills or punches the conduit openings exactly where the run needs them, which means no unused openings to plug and a fully closed box until you cut it. Plan on bringing a knockout punch or hole saw to the job. If you would rather have a factory opening, the Cantex 5133690 4-1/8 inch box comes with a 1/2 inch knockout and cover.
3) What are the actual dimensions of the Milbank 666 screw cover junction box?
6 x 6 x 6 inches. The 6 inch depth gives you more room for splices, taps and wire bending than a typical shallow square box, which matters when several conduits land in the same enclosure. By comparison, the Carlon E987R screw-cover box is 6 x 6 x 4 inches and the Orbit D4SB is a 1-1/2 inch deep 4 inch square.
4) What does unflanged mean on a screw cover junction box, and when would I want flanged instead?
Unflanged means the body has no lip projecting off the sides, so the box sits flat and low against a wall, panel or piece of equipment. The cover screws down onto the body itself. A flanged box carries a mounting lip around the opening and is used where you need the cover to overlap a surface or where the mounting pattern has to sit outside the box footprint. For a surface-mounted splice point on an indoor wall, the unflanged 666-SC1-NK-NP configuration is the straightforward choice.
5) Is a galvanized steel junction box or a PVC one better for an indoor industrial splice point?
Steel takes the abuse. The Milbank 666 box is unpainted G90 galvanized steel, which gives it corrosion resistance plus the structural rigidity to survive a job site and support conduit entries you drill yourself. Non-metallic boxes like the Carlon E987R polycarbonate screw-cover box or the Cantex E983G PVC family are the pick where you want a non-conductive, non-rusting enclosure and are running nonmetallic raceway. If you are landing EMT or rigid conduit and want the box in the grounding path, go metallic.
6) What is the exact part number to order the 6x6x6 Milbank galvanized screw cover box?
Milbank 666-SC1-NK-NP. Reading the suffixes: SC1 is the NEMA 1 screw cover, NK is no knockouts, NP is no paint (bare G90 galvanized). If your spec calls for knockouts or a painted finish, that is a different Milbank part number, so match the suffix string to the drawing.
7) Will a Milbank 666-SC1-NK-NP work as a pull box between conduit runs in a commercial building?
That is one of its intended uses. The 6 x 6 x 6 inch galvanized body is used for indoor wiring junctions, splice points, conduit and raceway systems with field-drilled entries, and panelboard or load center wiring junctions. Because it ships blank, you place the entries to suit your pull geometry rather than working around factory knockouts. Keep it to dry indoor locations, since the enclosure is NEMA 1.
8) What steel junction box can I use instead of the Milbank 666-SC1-NK-NP for a standard 4-inch square device application?
Orbit offers two steel square boxes at the 4-inch trade size: the 4SDB Series square deep box in welded steel with a 1-inch knockout, and the D4SB Series 1-1/2-inch deep 4-inch square box in drawn steel, supplied in packs of 100. Both are smaller than the Milbank 666-SC1-NK-NP at 6 inches by 6 inches by 6 inches, and both come with knockouts, where the Milbank ships without knockouts so conduit entries are field-drilled.
9) Is the Cantex 5133690 junction box a substitute for the Milbank 666-SC1-NK-NP?
They are not interchangeable. The Cantex 5133690 is a 4-1/8 inch junction box supplied with a 1/2 inch knockout and a cover. The Milbank 666-SC1-NK-NP is a 6-inch by 6-inch by 6-inch galvanized steel box with no knockouts, so conduit openings are drilled in the field. If the raceway is already landed on 1/2 inch conduit at a 4-inch box opening, the Cantex matches that; if you need the larger splice volume or custom entry locations, the Milbank does.
10) Which junction box opens fastest for repeated inspection or troubleshooting?
The Rittal 80181 JB Series uses a hinged cover, so the lid stays captive to the box when opened. The Milbank 666-SC1-NK-NP and the Carlon E987R both use screw covers, which require backing out fasteners and handling a loose lid each time. For a box you expect to open on a regular maintenance interval, the hinged design changes the service routine.
11) Is the cover on the Milbank 666 box removable for inspection, or is it hinged?
It is a screw-on cover, not hinged. You back the screws out to open it for splicing, inspection or troubleshooting, and it stays positively secured the rest of the time. Where a tech opens the same box repeatedly and does not want a loose cover in hand, a hinged enclosure such as the Rittal 80181 JB Series is the alternative.
How fast can I get the Milbank 666-SC1-NK-NP delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Milbank 666-SC1-NK-NP come with a warranty?
Absolutely. The Milbank 666-SC1-NK-NP is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Milbank 666-SC1-NK-NP?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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