NAICS 332613: Spring Manufacturing

NAICS 332613 – Spring Manufacturing covers the precision fabrication of mechanical springs used in critical load-bearing, energy-storing, and damping applications across defense, aerospace, and industrial systems. This includes helical, torsion, leaf, disc, and custom-designed springs manufactured from high-strength alloys such as stainless steel, inconel, and music wire, often to military specifications like MIL-S-83390 or ASME B18.13. These components are essential in weapon systems, vehicle suspensions, avionics actuators, and munition arming mechanisms, where reliability under extreme stress, temperature, and cyclic loading is non-negotiable. The sector supports advanced manufacturing processes including cold/hot coiling, stress relieving, shot peening, and precision grinding, often requiring AS9100 or ISO 9001 certification. In government contracting, this NAICS sits at the intersection of mechanical engineering and defense supply chain resilience, with demand driven by modernization programs and maintenance of legacy platforms. Top contractors in this space include EVERSTONE INDUSTRIES LLC and ALLOY SLING CHAINS, LLC, both of which are small businesses specializing in high-precision spring assemblies for defense and aerospace applications. These firms typically operate as niche suppliers with deep expertise in custom spring design and low-volume, high-reliability production, serving as tier-two or tier-three subcontractors to larger primes. The Department of Defense is the dominant buyer, with procurement activity concentrated in programs involving ground vehicle systems, missile guidance components, aircraft landing gear, and ordnance mechanisms. Demand is sustained by fleet sustainment, depot-level maintenance, and new acquisition initiatives requiring mission-critical spring components. The competitive landscape is characterized by specialized, often small-scale manufacturers with strong engineering capabilities and certification compliance. Opportunities exist for firms with expertise in advanced materials, automated coiling, and non-destructive testing. Procurement trends indicate a growing preference for domestic sourcing and just-in-time delivery to support agile defense logistics.