4" *4" *1-1/2" Metal Square Junction box

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$0.10 - $5.00 / Piece | 5000 Piece/Pieces (Min. Order)
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Quick Details
Place of Origin:
Zhejiang, China
Brand Name:
Model Number:
Junction Box
External Size:
4" * 4" * 1-1/2''
Product Name:
Junction Box
16 GA Sheet Steel, Available stainless steel
Manufacturing Process:
Welded or Drawn
Approval And Testing:
UL and Rohs
(2) #8-32 screws (2) BX clamp (1) Bracket
Install Wire
Supply Ability
Supply Ability:
10000 Piece/Pieces per Day
Packaging & Delivery
Packaging Details
Carton, Pallet
Ningbo or Shanghai
Lead Time :
20-30 days after the order confirmed
Product Description


General Description


4" Square (4S) Boxes Extension Rings are used to install lighting fixtures, switches, and receptacles in ceilings and walls,with both welded steel and drawn steel construction.

  • Product Code:  /
  • Material: 16 GA Sheet Steel,Available Stainless Steel
  • Finish: Pre-Galvanized
  • Mfg. Process: Drawn


Certification and Testing

  • Material Inspection certification
  • Final Testing Report 
  • RoHs
  • UL (Pending)


  • Width                           4"
  • Height                          4"
  • Depth                          1 - 1/2"
  • Cu In                           21
  • KO Sides                    6-1/2" KO 
  • KO Bottom                  (1) - 1/2"
  • Bracket Style              N/A
Packaging & Shipping


Kangrui takes tremendous pride in the way we package and mark our shipments. We believe it is our responsibility to do everything in our power to ensure that your products make it safely from origin to destination and are labeled for easy receipt. Not only are our boxes some of the strongest on the market, we also palletize, band, and shrink wrap your shipments. Labels are large and clearly visible, while boxes containing certification documents are clearly marked.

Once an order had shipped an email sent immediately with Invoice and Packaging List.


If you have special requirements regarding assembly of hardware, Batch No, Pallet Size, carrier preferences, or any other needs, simply let us know. We understand the importance of receiving your orders complete and on schedule.



Our Services


Quality plays a cross role in each Kangrui process, from the initial designing of samples to final the production batch products, dealing with different mechanisms of verification on the various supply/production flows and it covers the role of prior identification of the most critical stages during the control. Our climate controlled facilities performs mechanical, hardness, zinc testing and tensile loading testing to ensure our product are within good performance. If our climate have special testing requirements for our products, these testing also will be tested by third part, which lets our customers know that they can count on the consistent quality of Kangrui's products and services.

Our certification packages are the most accurate and comprehensive in the industry. We store all of our documents electronically for easy retrieval should you ever need an additional copy. For all order with an email address, A PDF copy of the certifications will be sent immediately after the order has shipped. This is standard procedure. If you have special certification requirements, just let us know and we will happy to accommodate your needs. 


Company Information


Kangrui is able to develop new and still better products rapidly through its own Research and Development depart. In initial stage, our client just need to offer us with the drawing or samples of product, our R&D team will be working on the designing of all tooling. And then we deliver our samples to our clients for confirmation and testing, ensuring all details meet client’s requirements perfectly. Certainly, our engineer will listen the feedback from our client.

Raw Material


How to make sure the performance of raw material is the essential issue as a manufacturer. In order to ensure the raw material meet the requirement from client, we always insist on choosing reliable supplier for steel material. So our client will obtain the material certification after the order have been shipped.



Kangrui have a complete production line for quenching, some items like Express Nails, you have to care about the flexibility with them, and so we will choose the method of quenching to enhance its hardness. Certainly, our QC staff will fulfill the testing of HRC in our laboratory.


Surface Treatment


Kangrui offer so enough many option for the surface treatment. Including zinc plating, Pre-galvanized, Hot-dip Galvanizing, Dacromet, Powder Coating. For the specified performance for each surface treatment, please referred to this report.



1.Manufacturer vs. Trading company … What’s the difference?

Kangrui is a manufacturer of fixings system, wood connector and Metal Stamping, Not a Trading Company, that means we are able to provide you high quality products  at the best price. Plus, we also strive to meet your custom requirements for metal fabrication.

 2. Are you able to produce by the drawing from clients?

Certainly, it’s also an advantage, you just need to provide me with your drawing or samples which you are looking for, we will be designing the new module, and preparing the samples for your confirmation. We are able to make sure the samples are exactly the same with the final products, even better, between us.

3.  How long it will take to finish my order as I confirmed the order

Generally , We will finish the production after the order was confirmed within 30 days . Of course ,If you in an urge , We can talk about the shipment time .All that we want to do is to ensure all the orders can be delivered as scheduled .

 4.  What kinds of finishes are available?

  • Zinc Plated: Yellow Zinc Plated, White zinc Plated, Black Zinc Plated;
  • Hot Dip Galvanized
  • Dacrotizing
  • Nickel Plating
  • Powder Coating

 5.Where will my product be shipped from?


Kangrui’s factory, administration, and sales department is located in Yuyao, Ningbo, just close to Ningbo Port,. Besides, the Shanghai Port is also available.

 6. What kinds of packaging do you provide?


We will respect the packaging instruction from client, and strictly fulfilled it. And we also provide the packaging designing service for specific products.  

 7. Are there quality standards for Kangrui production?


Before we start to produce, firstly, we will send the drawing or the samples to you for confirmation. After the production is finished, we will send you picture for your reference, including the production and the packaging. and we will also provide you the final testing report .