
5" Deep Steel Octagon Concrete Box with 1/2" & 3/4" Side Knockouts
Pairs well with
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The 4" Steel Octagon Concrete Box – 5" Deep is designed for durable and secure electrical installations in concrete structures. Made from 16-gauge sheet steel, this box provides excellent strength and reliability for demanding environments. Its galvanized finish enhances corrosion resistance, ensuring long-term performance.
With (2) 1/2" knockouts on sides 1, 3, 5, 7 and (2) 3/4" knockouts on sides 2, 4, 6, 8, this box allows for flexible conduit entry and easy wiring configurations. The 5" depth provides an expansive 61.7 cubic inch capacity, offering ample room for electrical connections. Additionally, it is rated for fixture support of 50 lbs or less, making it ideal for lighting, ceiling fans, and junction applications.
Key Features:
- Material: 16 GA sheet steel for strength and durability
- Finish: Galvanized for enhanced corrosion resistance
- Depth: 5" for increased wiring capacity
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Knockouts (KOs):
- Sides 1, 3, 5, 7: (2) 1/2" KOs each
- Sides 2, 4, 6, 8: (2) 3/4" KOs each
- Capacity: 61.7 cubic inches for secure and organized wiring connections
- Fixture Support: Rated for fixtures weighing 50 lbs or less
- Application: Ideal for electrical wiring in concrete installations, supporting lighting, ceiling fans, and junctions

5" Deep Steel Octagon Concrete Box with 1/2" & 3/4" Side Knockouts
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Shipping Information
Orders placed before 12:00 PM (PST) ship the same day or within 2 business days, with tracking provided within 72 hours. Learn more in our Shipping Policy.
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Returns & Exchanges
Non-defective items may be returned within 30 days with a 30% restocking fee. Shipping costs are non-refundable, and return shipping is the customer’s responsibility. See our full Return Policy.
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Cancellations
Orders can be canceled before shipment; if already shipped, standard return fees apply. Learn more about Cancellations.
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Damaged Shipments & Shortages
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