Swiss Machining
Produce small, complex stainless steel components with exceptional dimensional stability and tolerances as tight as ±0.0001 inches for aerospace and defense assemblies.
M.A.R.'s Engineering delivers precision stainless steel fabrication and machining for aerospace and defense applications where tight tolerances, traceability, and repeatable quality are critical. From prototype development to high-volume production, our integrated in-house capabilities help reduce lead times, simplify sourcing, and produce complex components built for demanding performance standards.

Precision stainless steel manufacturing solutions for aerospace and defense components, from intricate prototypes to repeatable production runs.
Produce small, complex stainless steel components with exceptional dimensional stability and tolerances as tight as ±0.0001 inches for aerospace and defense assemblies.
Machine cylindrical stainless steel parts such as fittings, bushings, shafts, and threaded components with consistent feature relationships across prototype and production quantities.
Create intricate stainless steel parts with sharp internal corners, detailed profiles, and precise features that conventional machining cannot easily achieve.
Manufacture custom stainless steel fittings and connectors with threads, grooves, ports, and sealing features for critical aerospace and defense applications.
Fabricate precision stainless steel flanges and couplings with accurate bores, bolt circles, and machined features for structural and mechanical systems.
Complete stainless steel components with in-house finishing, polishing, plating, and light assembly to meet corrosion resistance and performance requirements.
For aerospace and defense programs, stainless steel components must perform reliably under strict dimensional and material requirements. M.A.R.'s Engineering combines Swiss machining, CNC turning, EDM, grinding, and in-house finishing to deliver complex parts with consistent quality, reduced vendor handoffs, and full production support. Our integrated workflow helps customers move from prototype to repeatable manufacturing with greater speed and control.

See how precision machining and integrated production support demanding aerospace and defense component requirements.
Customers rely on our experience, integrated capabilities, and quality-focused production approach.
Family-owned precision manufacturing experience built over nearly 60 years of complex part production.
Machining, EDM, finishing, and light assembly in one facility reduce delays and vendor coordination.
Processes support ultra-close tolerances up to 0.0001 inches for critical aerospace and defense components.
ISO-compliant systems and Mil-1-45208A alignment support consistency, inspection, and production traceability.
Experienced machinists and manufacturing specialists you can trust.
M.A.R.'s Engineering has been a family-run precision manufacturing company since 1964, founded by Manuel and Reine Ambrosio and expanded over the decades through steady investment in equipment, processes, and in-house capabilities. What began as a screw machining operation grew into a complete manufacturing partner with CNC, multi-spindle, Wire EDM, grinding, finishing, and assembly support under one roof. Manny Blaine Ambrosio grew up in the business, began managing operations in 1990, and purchased the company in 1996, continuing its focus on close-tolerance work and responsive customer service. Today, the company supports demanding industries such as aerospace and defense with a practical, quality-driven approach built on experience, traceability, and long-term customer relationships.
M.A.R.'s Engineering manufactures a wide range of stainless steel components, including fittings, connectors, flanges, couplings, shafts, pins, bushings, sleeves, threaded parts, and miniature precision components. Using Swiss machining, CNC turning, EDM, milling, and grinding, we can support both simple cylindrical parts and complex geometries with critical functional features.
Talk with our team about materials, tolerances, and production options.
Quality-focused systems for consistent manufacturing control.
Aligned with documented inspection and quality practices.
Long-standing manufacturing experience customers rely on.
Share your drawings, specifications, quantities, and timeline. Our team will review your project and help identify the right in-house manufacturing approach.
For immediate assistance, feel free to give us a direct call at +1 510-483-0541. You can also send us a quick email at info@marseng.com.
For immediate assistance, feel free to give us a direct call at +1 510-483-0541. You can also send us a quick email at info@marseng.com.