Open: $5.2810 USD/lb
12/05/2025
Close: $5.2915 USD/lb
12/04/2025
COMEX Aluminum
Latest: $2.1559 USD/lb
12/01/2025
Previous: $2.0790 USD/lb
11/01/2025
COMEX
CU
5.2810
AL
2.1559
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Steel Boxes, Covers, & Accessories

4IN SQBX 3-1/2D 1/2&3/4 KO

Southwire #: 52181-S Model #: 52181-S
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4 SQ 3-1/2 IN EXTRA JUNCT BX

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4IN SQBX 3-1/2D 1/2&3/4 KO
4IN SQBX 3-1/2D 1/2&3/4 KO

Features & Benefits

  • External tabs allow installer to nail/screw boxes to forms for stability during concrete pour
  • Combination knockouts allow for greater wiring flexibility
  • Raised Ground
  • Combination Phillips/Slotted screw heads.
  • UL, RoHS Compliant

Specifications

Model # 52181-S 52181-S
UPC # 785592400857 785592400857
Product Height 3.5 8.89 inch cm
Product Width 4.0 10.16 inch cm
Product Weight 1.45 0.66 lbs kg
Material Galvanized Steel Galvanized Steel
Cubic Capacity 50.0 (819.4) 50.0 (819.4)
Standard Package 10 10
Bottom Knockouts (3) 1/2", (2) 1/2" - 3/4" (3) 1/2", (2) 1/2" - 3/4"
Side Knockouts (4) 1/2" - 3/4", (2) 1/2", (2) 3/4" (4) 1/2" - 3/4", (2) 1/2", (2) 3/4"
Color Silver Silver
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