Welcome to S-Square

S-Square Tube Products, Inc. is the manufacturer of industry-leading NEX® tubing and NEX® tube products. We offer Steel Tubing, Sign Support Systems, and Mailbox Support Systems that are strong, safe and aesthetically pleasing. Our product line offers the ideal solutions for mounting or supports in a wide range of applications. Our products are best-in-class and are tested to obtain full certification for the stringent requirements of FHWA NCHRP 350 and the 2001 AASHTO design recommendations.