SEILER INSTRUMENT AND MANUFACTURING COMPANY, INCORPORATED

Seiler Instrument and Manufacturing Company, Incorporated specializes in the precision manufacturing of complex mechanical and electro-mechanical systems for defense and industrial applications. Their core capabilities include the design and production of optical instruments, precision lenses, measuring and control devices, ordnance components, and specialized machinery for military and commercial use. The contractor demonstrates deep expertise in metal fabrication, high-tolerance machining, and system integration for mission-critical applications, particularly in optical sensing, fluid measurement, and armored vehicle subsystems. Their ability to execute engineering change proposals, manage variance requests, and deliver modifications under tight timelines underscores a mature production and quality assurance process aligned with defense standards. The company maintains a consistent and primary relationship with the Department of Defense, particularly through DLA Land Warren, where they deliver modifications, engineering updates, and production adjustments for existing defense systems. Their work with DLA Aviation and DLA Land and Maritime further indicates involvement in aerospace and land-based platform sustainment, including component replacements and system upgrades. These engagements reflect a trusted supplier role focused on lifecycle support rather than initial procurement. Industry focus centers on NAICS 333310 (commercial and service industry machinery), 332994 (ordnance manufacturing), and 333314 (optical instrument manufacturing), positioning them as a niche provider of specialized hardware for military and industrial instrumentation. They serve vertical markets requiring ruggedized, high-reliability components, including armored vehicle systems, aircraft subsystems, and precision measurement equipment. As a small business structured as a 2L entity based in St. Louis, Missouri, Seiler Instrument operates without federal certifications but maintains a strong footprint in the defense industrial base through technical precision and responsive manufacturing agility. Their geographic location supports proximity to key DoD logistics hubs, enhancing supply chain responsiveness.