B-Line Eaton series Type 3/3R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$565.16
B-Line Eaton series Type 3/3R junction boxes, 6" height, 4" length, 6" width, 3R, Hinged cover, RTHC NK enclosure, Surface mounted, Small single door

B-Line Eaton series Type 3/3R junction boxes, 6" height, 4" length, 6" width, 3R, Hinged cover, RTHC NK enclosure, Surface mounted, Small single door

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Model: 664 RTHC NK
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$565.16
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Eaton B-Line series Type 3/3R junction boxes, 6" height, 4" length, 6" width, NEMA 3R, Hinged cover, RTHC NK enclosure, Surface mounted, Small single door, No knockout, Embossed thru holes, Carbon steel

Manufacturer Resources

Product Specs

Certifications:
UL 50
Closure Type:
Formed top hinge
Country Of Origin:
United States
Cover Type:
Hinged
Finish Color:
Painted
Locking Provisions:
Padlock provision
Mounting Hole Details:
Embossed thru holes
Mounting Method:
Surface
Nema Rating:
3R
Product Height:
6 in
Product Length Depth:
4 in
Product Weight:
2.3 lb
Product Width:
6 in
Special Features:
Rain hood, removable cover
Wall Thickness:
16 gauge
Department:
Electrical
Product Model:
RTHC NK enclosure
Product Color:
ANSI 61 gray
Product Style:
Small single door
Product Material:
Carbon steel

B-LINE 664 RTHC NK – Frequently Asked Questions

1) Can the B-Line 664 RTHC NK junction box be mounted outdoors?
Yes. The 664 RTHC NK carries a NEMA 3R rating, which covers outdoor use against falling rain, sleet and ice formation, and it includes a rain hood over the door. It is UL 50 listed. It is not a washdown or hosedown enclosure, so if the location sees direct spray or pressure washing you need a Type 4 or 4X box instead.
2) Does this B-Line enclosure come with knockouts for conduit?
No. The NK in 664 RTHC NK means no knockouts, so the box ships blank and you punch your own conduit openings where the run actually lands. If you want factory knockouts, order a knockout version of the RTHC instead of the NK.
3) How does the 664 RTHC NK cover open, and can it be locked?
The door is a hinged cover on a formed top hinge, so it swings up and stays with the box rather than coming off in your hand. There is a padlock provision on the door for a standard shackle padlock, which is what most facilities use to keep an outdoor pull box closed to unauthorized hands. The cover is also removable if you need the box fully open to pull wire.
4) How does this junction box mount to a wall?
Surface mount only. The back of the box has embossed thru holes, meaning the mounting holes sit in raised dimples so the fastener heads hold the box slightly off the wall and water does not track into the hole. Hardware is not part of the box, so pick anchors to suit the substrate. It is not a flush or recessed enclosure.
5) Will the finish on this B-Line box match the other gray enclosures on my site?
It is painted ANSI 61 gray, the standard light gray used across most industrial electrical enclosures, so it will read the same as other ANSI 61 gear on the wall. The substrate is carbon steel, not stainless or aluminum, so touch up any field-drilled conduit openings to keep rust out of the cut edge.
6) Is a hinged 3R box like this better than a screw-cover pull box?
Depends how often you go back into it. A screw-cover box is cheaper and fine for a splice you will never touch. The 664 RTHC NK hinged type earns its place where a tech opens the box regularly, because the door stays captive on its formed top hinge and there are no cover screws to drop off a ladder, and the padlock provision lets you secure it between visits. For an indoor-only splice with no weather exposure, a Type 1 box does the same job for less.
7) What is the exact part number to order this B-Line enclosure?
Order Eaton B-Line part number 664 RTHC NK. It is a small single door style box made in the US.
How fast can I get the B-LINE 664 RTHC NK 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 B-LINE 664 RTHC NK come with a warranty?
Absolutely. The B-LINE 664 RTHC NK 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 B-LINE 664 RTHC NK?
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
Why buy the B-LINE 664 RTHC NK from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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