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Explore 4"" Square Boxes - Extensions Products - Browse List

At Industrials Unlimited, our goal is to make the parts procurement process easier than it has ever been. Part of this is making the process of finding the exact part you need as fast as possible. To do this, we provide specific subcategories along with each part category in our vast inventory. For example, if you are searching for parts such as 4-sw-ext-spl, 4sb-mko-ehb, 4sb-mko-ext, 4sdb-mko-ext, 4se-1-2, you will find them here in the subcategory 4"" Square Boxes - Extensions. At Industrials Unlimited, we provide each customer with access to a vast, diverse, and highly streamlined inventory which contains a broad range of industrial and automation parts. Furthermore, if you need parts not in our inventory, they can be sourced and shipped directly to you through our international supply chain network that spans the United States, Canada, and the United Kingdom. At Industrials Unlimited, our goal is not only to improve the purchasing experience, but to revolutionize it entirely.

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Part No.DescriptionManufacturerSub CategoryRFQ
4-sw-ext-splSteel City 4-SW-EXT-SPL 4"" Square Extension Ring, 1-1/2"" Deep, Welded, MetallicSteel City
4sb-mko-ehbOrbit Industries 4SB-MKO-EHB 4"" Square Extension Ring, WeldedOrbit Industries
4sb-mko-extOrbit Industries 4SB-MKO-EXT 4"" Square Extension Ring, WeldedOrbit Industries
4sdb-mko-extOrbit Industries 4SDB-MKO-EXT 4"" Square Extension Ring, 2-1/8"" Deep, Welded, SteelOrbit Industries
4se-1-2Appleton 4SE-1/2 4"" Square Extension Ring, 1-1/2"" Deep, Drawn, MetallicAppleton
4se-3-4Appleton 4SE-3/4 4"" Square Extension Ring, 1-1/2"" Deep, Drawn, MetallicAppleton
4sesAppleton 4SES 4"" Square Extension Ring, 1-1/2"" Deep, Drawn, MetallicAppleton
4sesrdAppleton 4SESRD 4 In Sq Ext-thru Ring RedAppleton
4ssbesplAppleton 4SSBESPL 4"" Square Extension Ring, 1-1/2"" Deep, Welded, MetallicAppleton
53151-1-2Steel City 53151-1/2 4 INCH SQ BX EXT,STL,21CU,1/2KOIN.Steel City
53151-1-2-3-4Steel City 53151-1/2-3/4 4"" Square Extension Ring, 1-1/2"" Deep, Drawn, MetallicSteel City
53151-3-4Steel City 53151-3/4 4 INCH SQ BX EXT,STL,21CU,3/4KOIN.Steel City
531511234-20rSteel City 531511234-20R STL 531511234-20R 4 SQ 1 1/2Steel City
531511234ubSteel City 531511234UB 1/2 & 3/4 BOX EXT RING 21CUB STLSteel City
531511-23-4ub-30Steel City 531511/23/4UB-30 UNIT UPC CODE: 785991 16781Steel City
53151-subGarvin Industries 53151-SUB 4"" SQ EXTRNG,1-1/2D, FOR UTILGarvin Industries
53151-svtGarvin Industries 53151-SVT 4"" SQ EXTRNG, 1-1/2D, PLENUMGarvin Industries
53171-1Steel City 53171-1 4"" Square Extension Ring, 2-1/8"", Welded, MetallicSteel City
53171-1Garvin Industries 53171-1 4"" SQBX, 2-1/8D, DRWN,Garvin Industries
53171-subGarvin Industries 53171-SUB 4 SQ EXT RING 2-1/8 DGarvin Industries

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Americas Fastest Growing Private Company
ASA Member
NBAA Member
ISO 9001:2015 & AS9120B
Cage Code 6RE77
ITAR
eCustoms Visual Compliance
D-U-N-S Number 069876325
FAA 0056 B Accredited
ESD S20.20
AS 6081:2012
NIST 800-171 Compliance
Top Distributors 2018
Top Distributors 2020
Top Distributors 2025

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