Home Electrical Boxes & Conduit Bodies 4-Inch Octagon Steel Boxes

VELKOR STEEL JUNCTION BOXES & COVERS

4-Inch Octagon Steel Boxes

Velkor 4-Inch Octagon Steel Boxes provide a galvanized steel enclosure for wiring connections.

4-Inch Octagon Steel Boxes Drawn bodies are offered in 1-1/2-inch and 2-1/8-inch depths, with several side and bottom knockout patterns. Two depths provide 15.5 or 21.5 cubic inches of capacity. Knockout options include 1/2-inch, 3/4-inch and selected combination openings. Grounding variants are listed for the 1-1/2-inch range. TYPICAL APPLICATIONS Lighting connections Wiring connections Modern Standards […]

MATERIAL

Steel

FINISH

Galvanized

Catalog No.

54151 / 54171 Series

ADD TO INQUIRY

REQUEST A QUOTE

4-Inch Octagon Steel Boxes

Drawn bodies are offered in 1-1/2-inch and 2-1/8-inch depths, with several side and bottom knockout patterns.

TYPICAL APPLICATIONS

Lighting connections

Wiring connections

Specifications

1-1/2-Inch Deep Boxes

54151 Series

2-1/8-Inch Deep Boxes

54171 Series

1-1/2-Inch Deep Boxes

Material

Steel

Finish

Galvanized

Click a row to add it to your inquiry.

Catalog No.	KNOCKOUTS - SIDES	KNOCKOUTS - BOTTOM	Depth	Capacity
54151-1/2	4x1/2"	5x1/2"	1-1/2"	15.5 cu. in.
54151-3/4	4x3/4"	3x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-1/2&3/4	2x1/2"+2x3/4"	3x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-CKO1	4xCKO	3x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-CKO2	4xCKO	1x1/2"+4xCKO	1-1/2"	15.5 cu. in.
54151-1/2P	4x1/2"	4x1/2"	1-1/2"	15.5 cu. in.
54151-3/4P	4x3/4"	2x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-1/2&3/4P	2x1/2"+2x3/4"	2x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-CKO1P	4xCKO	2x1/2"+2x3/4"	1-1/2"	15.5 cu. in.
54151-CKO2P	4xCKO	1x1/2"+3xCKO	1-1/2"	15.5 cu. in.

CUT SHEET (PDF)

2-1/8-Inch Deep Boxes

Material

Steel

Finish

Galvanized

Click a row to add it to your inquiry.

Catalog No.	KNOCKOUTS - SIDES	KNOCKOUTS - BOTTOM	Depth	Capacity
54171-1/2	4x1/2"	5x1/2"	2-1/8"	21.5 cu. in.
54171-3/4	4x3/4"	3x1/2"+2x3/4"	2-1/8"	21.5 cu. in.
54171-1/2&3/4	2x1/2"+2x3/4"	3x1/2"+2x3/4"	2-1/8"	21.5 cu. in.
54171-1	4x1"	3x1/2"+2x3/4"	2-1/8"	21.5 cu. in.
54171-CKO1	4xCKO	3x1/2"+2x3/4"	2-1/8"	21.5 cu. in.
54171-CKO2	4xCKO	1x1/2"+4xCKO	2-1/8"	21.5 cu. in.

CUT SHEET (PDF)

Outside diameter tolerances: ±.005 in (.13 mm) for trade sizes 1/2–2" (16–53 mm); ±.010 in (.25 mm) for 2-1/2" (63 mm); ±.015 in (.38 mm) for 3" (78 mm); ±.020 in (.51 mm) for 3-1/2" and 4" (91–103 mm).

P-suffix models in the 1-1/2 in table have a grounding bump and ground screws.

Modern Standards for Traditional Products

Verified

Product verified against Velkor quality standards before it ships.

PRECISE

Precision in every detail, from engineering drawing to final delivery.

RELIABLE

Stable quality and dependable lead times you can plan a project around.

SYSTEMATIC

A structured process that keeps complex projects consistent and on track.

PARTNER

More than a supplier — we build long-term partnerships with our clients.

Manufacturing Center of Excellence

Contact & Inquiry

Let's Make Sourcing Simple.

Send us your specifications, drawings, or project requirements. We’ll help you find the right fit and get things moving. We respond within 8 hours.

Info@velkor.co

China: +86 158-6717-8588

ADDRESS

Puyang Industrial Zone, Hangzhou, Zhejiang, China

NAME COMPANY EMAIL PHONE PRODUCT OF INTEREST MESSAGE

Send Inquiry

Electrical Metallic Tubing

Electrical Metallic Tubing Velkor manufactures Electrical Metallic Tubing (EMT) for commercial, industrial, and residential electrical installations. Every conduit is produced from premium low-carbon steel, delivering smooth bending performance, dimensional consistency, and dependable installation efficiency. Whether you need a cost-effective standard solution or maximum corrosion protection for demanding environments, Velkor offers the right zinc coating option for your project.

EMT Connector – Set Screw Type – Zinc Die Cast

EMT Connector – Set Screw Type – Zinc Die Cast Velkor set-screw EMT connectors are die-cast from virgin zinc alloy rather than lower-grade recycled material. Maintaining a controlled alloy composition helps reduce brittleness and the risk of cracking, giving the fitting greater toughness during installation, handling and transport.

EMT Coupling – Set Screw Type – Zinc Die Cast

EMT Coupling – Set Screw Type – Zinc Die Cast Velkor zinc die-cast set-screw EMT couplings join two lengths of EMT in a straight run. Each conduit end is secured independently by its own set screw, while the one-piece zinc alloy body supports consistent dimensions and straightforward installation.

EMT Connector – Compression Type – Zinc Die Cast

EMT Connector – Compression Type – Zinc Die Cast This zinc die-cast compression connector terminates EMT conduit at an electrical box, cabinet, or enclosure. Its compression nut applies circumferential clamping around the conduit for controlled alignment, while the one-piece zinc alloy body offers dimensional consistency and a clean installation profile.

EMT Coupling – Compression Type – Zinc Die Cast

EMT Coupling – Compression Type – Zinc Die Cast Velkor zinc die-cast compression EMT couplings join two lengths of EMT using independently tightened compression nuts. The compression mechanism grips around each conduit end to support alignment without exposed set screws, while the zinc die-cast body provides a clean, compact profile.

EMT Connector – Set Screw Type – Steel

EMT Connector – Set Screw Type – Steel Designed to connect EMT conduit securely to electrical boxes and enclosures through knockout openings. Manufactured from durable steel with a zinc-plated finish for corrosion protection. The set-screw design allows quick installation and provides a secure connection in dry locations.

View all EMT Conduit System

Intermediate Metal Conduit

Intermediate Metal Conduit Velkor Intermediate Metal Conduit (IMC) provides greater wall strength and mechanical protection than EMT while remaining lighter than conventional rigid metal conduit. Three product configurations allow buyers to select the appropriate wall thickness, zinc coating and standard compliance for their market, project and budget.

Rigid Metal Conduit – Hot-Dip Galvanized Steel

Rigid Metal Conduit – Hot-Dip Galvanized Steel Velkor Rigid Metal Conduit is a heavy-wall steel raceway for installations that require greater mechanical protection than lighter metallic conduit systems. Each cataloged 3050 mm length is threaded for use with a rigid conduit coupling and supplied-end protection should be confirmed with the order specification.

RIGID 90 Degree Radius Elbow – Galvanized Steel

RIGID 90 Degree Radius Elbow – Galvanized Steel Velkor RIGID 90 degree radius elbows redirect threaded RIGID or IMC conduit runs through a right-angle bend. The galvanized steel body provides a formed metal pathway for changing direction within the threaded raceway system.

RIGID Coupling – Tubular Threaded – Galvanized Steel

RIGID Coupling – Tubular Threaded – Galvanized Steel Velkor tubular threaded RIGID couplings join two threaded RMC or IMC lengths to maintain raceway continuity. The galvanized steel body provides a direct threaded connection.

RIGID Strap – Two Hole – Galvanized Steel

RIGID Strap – Two Hole – Galvanized Steel Velkor two-hole RIGID straps support RIGID or IMC conduit against a mounting surface. A fastening point on each side of the conduit gives installers a balanced two-point attachment across the strap.

Rigid One-Hole Strap – Galvanized Steel

Rigid One-Hole Strap – Galvanized Steel Velkor rigid one-hole straps secure RMC or IMC to a mounting surface with one fastening point. The compact galvanized-steel profile is useful where installers need direct surface support without the wider footprint of a two-hole strap.

View all IMC/RMC Conduit System

Flexible Metal Conduit – Greenfield

Flexible Metal Conduit – Greenfield Velkor Greenfield Flexible Metal Conduit provides flexible and reliable cable routing around equipment, machinery, and tight installation spaces. Its galvanized steel construction forms a continuous flexible raceway, making it suitable for applications where rigid conduit is difficult to route or install. Greenfield flexible conduit is also commonly referred to as American Standard Steel Flexible Conduit. If you are looking for a square-locked construction with greater flexibility, please visit our Square-Locked Flexible Conduit (Ultra Flex) page.

PVC-Coated Flexible Metal Conduit – Square Lock

PVC-Coated Flexible Metal Conduit – Square Lock Velkor PVC-coated flexible metal conduit combines a square-lock metallic core with an external PVC covering for flexible cable routing and added surface protection. Its covered construction provides a practical option where a flexible metal raceway with a smoother outer surface is preferred.

Liquid-Tight Straight Connector – Zinc Die Cast

Liquid-Tight Straight Connector – Zinc Die Cast Velkor liquid-tight straight connectors terminate flexible conduit at a box cabinet or enclosure in a direct-line arrangement. The zinc die-cast body provides a compact fitting profile while the straight entry supports orderly routing where no direction change is needed.

Liquid-Tight 90° Connector – Zinc Die Cast

Liquid-Tight 90° Connector – Zinc Die Cast Velkor liquid-tight 90° connectors provide a right-angle transition from flexible conduit into a box, cabinet, or enclosure. The zinc die-cast body helps manage routing where straight entry is restricted and a compact change of direction is required.

BX/FMC Straight Squeeze Connector – Zinc Die Cast

BX/FMC Straight Squeeze Connector – Zinc Die Cast Velkor BX/FMC straight squeeze connectors join flexible metal conduit to an enclosure through a direct entry. The squeeze-style connection secures the conduit while the zinc die-cast body provides a compact fitting for straightforward routing layouts.

BX/FMC 90° Squeeze Connector – Zinc Die Cast

BX/FMC 90° Squeeze Connector – Zinc Die Cast Velkor BX/FMC 90° squeeze connectors provide a right-angle entry from flexible metal conduit into a box or enclosure. The squeeze connection supports secure conduit engagement while the zinc die-cast elbow helps organize installations with limited straight-line clearance.

View all Flexible Conduit System

RIGID Threaded Conduit Bodies

RIGID Threaded Conduit Bodies Velkor RIGID threaded conduit bodies provide accessible direction changes and pull points in threaded rigid conduit runs. Available in C, LB, LL, LR, and T configurations, each body is supplied with a cover and gasket.

EMT Set-Screw Conduit Bodies

EMT Set-Screw Conduit Bodies Velkor EMT set-screw conduit bodies provide accessible direction changes and pull points in electrical metallic tubing runs. Available in C, LB, LL, LR, and T configurations, each body is supplied with a cover and gasket.

Single-Gang Weatherproof Boxes

Single-Gang Weatherproof Boxes Velkor single-gang weatherproof boxes provide cast aluminum wiring space for surface-mounted devices and conduit terminations. Hole-pattern variants are organized by opening arrangement, including side-opening models identified by an X suffix.

Double Gang Weatherproof Boxes

Double Gang Weatherproof Boxes Velkor double gang weatherproof boxes provide cast aluminum wiring space for multi-device surface installations and conduit entry arrangements. The grouped catalog structure separates standard and side-opening hole patterns, with X suffixes reserved for side-opening models.

Triple-Gang Weatherproof Boxes

Triple-Gang Weatherproof Boxes Velkor Triple-Gang Weatherproof Boxes provide three device positions in a 2-inch-deep aluminum body.

4-Inch Round Weatherproof Boxes

4-Inch Round Weatherproof Boxes Velkor 4-Inch Round Weatherproof Boxes provide a round wiring enclosure with four side entries and one bottom entry.

View all Electrical Boxes & Conduit Bodies

41 × 41 mm Strut Channel – Plain and Slotted

41 × 41 mm Strut Channel – Plain and Slotted Velkor 41 × 41 mm strut channel is available in plain and slotted 3-meter configurations. A standard 2.5 mm thickness supports general framing and support-system selection, while alternative thicknesses and four finish codes are available for project-specific ordering.

41 × 21 mm Strut Channel – Plain and Slotted

41 × 21 mm Strut Channel – Plain and Slotted Velkor 41 × 21 mm strut channel is available in plain and slotted 3-meter configurations. The lower-profile section uses a standard 2.5 mm thickness, while other thicknesses and four finish options are available for project-specific ordering.

Strut Clamps

Strut Clamps Velkor strut clamps cover catalog series VK2101–VK2110 and trade sizes from 1/2 in through 4 in. The range is organized under the Strut Channel System; model-to-size mapping and product-specific construction details require confirmation before publication or ordering.

View all Strut Channel System

Metric EMT Steel Conduit – Unthreaded

Metric EMT Steel Conduit – Unthreaded Velkor Metric EMT Steel Conduit is an unthreaded metallic raceway for routing and protecting electrical conductors. Six metric sizes are supplied in 3 m lengths, with confirmed outside-diameter limits, wall thickness, piece weight and bundle quantity shown for each catalog number.

Metric RMC Steel Conduit – Hot-Dip Galvanized

Metric RMC Steel Conduit – Hot-Dip Galvanized Velkor Metric RMC Steel Conduit is a heavier-wall metallic raceway with threaded ends for compatible rigid-conduit connections. The supplied table covers 20–110 mm sizes in 3 m lengths and records diameter limits, wall thickness, piece weight and package quantity for each model.

Metric EMT Connector – Set-Screw Type – Zinc

Metric EMT Connector – Set-Screw Type – Zinc Velkor Zinc Set-Screw EMT Connectors terminate unthreaded metric conduit at junction boxes, cabinets and panels. The conduit-side screw secures the tube, while the threaded enclosure end forms the box entry. Sizes run from 16 to 110 mm. Complies with IEC 61386-1 and IEC 61386-21.

Metric EMT Coupling – Set-Screw Type – Zinc

Metric EMT Coupling – Set-Screw Type – Zinc Velkor Zinc Set-Screw EMT Couplings join two matching conduit lengths in a straight run. Separate screws secure the tube ends, providing accessible fastening points on both sides of the joint. The range covers 16–110 mm metric EMT. Complies with IEC 61386-1 and IEC 61386-21.

Metric EMT Connector – Autofijación Type – Steel

Metric EMT Connector – Autofijación Type – Steel Velkor Autofijación Steel EMT Connectors provide the transition from matching metric conduit to a box or cabinet. Five sizes cover 20, 25, 32, 40 and 50 mm conduit for installations specifying the Autofijación fitting format. Complies with IEC 61386-1 and IEC 61386-21.

Metric EMT Coupling – Autofijación Type – Steel

Metric EMT Coupling – Autofijación Type – Steel Velkor Autofijación Steel EMT Couplings connect two matching conduit lengths in a straight route. The series covers 20–50 mm metric EMT and is intended for layouts specifying Autofijación fittings. Complies with IEC 61386-1 and IEC 61386-21.

View all IEC 61386 Conduit System

BM Series Modular Switches & Sockets

BM Series Modular Switches & Sockets BM Series is a modular range of wall switches, power socket outlets, USB and communication outlets, combination units, and interchangeable cover plates. Buyers can select the required electrical function and coordinate the installation with a cataloged plate color or decorative finish.

View all Switches & Sockets