Swiss Machining
Produce small, complex aerospace and defense parts with exceptional stability and tolerances as tight as ±0.0001 inches using Swiss-type CNC equipment.
M.A.R.'s Engineering delivers precision-machined aerospace and defense components with tight tolerances, full traceability, and scalable production. From prototypes to high-volume runs, our San Leandro facility supports mission-critical parts with Swiss machining, EDM, CNC turning, and in-house finishing to help buyers reduce vendor complexity and maintain consistent quality.

Precision machining services for complex aerospace and defense components, from prototypes to repeat production.
Produce small, complex aerospace and defense parts with exceptional stability and tolerances as tight as ±0.0001 inches using Swiss-type CNC equipment.
Create intricate profiles, sharp internal corners, and detailed features in conductive and hardened materials for demanding defense and aerospace applications.
Manufacture cylindrical precision parts such as fittings, bushings, shafts, and threaded components with consistent dimensional accuracy across runs.
Machine micro-scale pins, spacers, contact extensions, and other miniature precision parts where standard machining cannot meet geometry or tolerance requirements.
Produce screws, bolts, studs, inserts, and standoffs with accurate thread forms and repeatable quality for aerospace and defense assemblies.
Deliver high-volume shafts and pins with fine finishes, tight diameter control, and optional secondary features like grooves, threads, and cross holes.
For aerospace and defense buyers, consistency matters as much as capability. M.A.R.'s Engineering combines Swiss machining, CNC turning, EDM, grinding, and in-house finishing under one roof to simplify sourcing and protect quality. With decades of experience in San Leandro manufacturing and an AS9100-driven approach to traceability, we help customers move from prototype to production with fewer handoffs, tighter control, and dependable repeatability.

See how precision machining and integrated production support demanding aerospace and defense requirements.
A dependable machining partner for complex, high-specification component manufacturing.
Family-owned since 1964, with decades of precision machining knowledge for critical component applications.
ISO-compliant processes and aerospace-focused quality controls support documentation, consistency, and full production traceability.
San Leandro production combines machining, EDM, grinding, finishing, and light assembly to reduce vendor handoffs.
From prototypes to 500-plus piece runs, equipment supports both custom development and efficient repeat production.
Built on decades of machining expertise.
M.A.R.'s Engineering Company Inc. has been family-run since 1964, when Manuel and Reine Ambrosio founded the business to specialize in precision screw machining of complex parts to close tolerances. Over the decades, the company expanded its capabilities through multi-spindle equipment, a dedicated CNC department, and in-house Wire EDM to strengthen quality control and responsiveness. Operating from San Leandro, M.A.R.'s Engineering serves manufacturers that need dependable machining support, traceability, and consistent repeatability. Our vision is to remain a trusted single-source manufacturing partner for customers who value precision, streamlined production, and long-term relationships built through service, accountability, and continuous investment in advanced machining technology.
M.A.R.'s Engineering manufactures a wide range of precision components used in aerospace and defense applications, including miniature parts, threaded fasteners, fittings, connectors, bushings, sleeves, shafts, pins, flanges, and couplings. Capabilities support both simple turned parts and complex geometries requiring milling, threading, grinding, EDM features, or finishing. Production can range from prototypes to high-volume runs depending on the part design and process selected.
Talk with our machining team about specs, tolerances, and production planning.
Supports documented quality management practices.
Quality compliance for inspection standards.
Long-standing precision manufacturing experience.
Share your drawings, quantities, materials, and tolerance requirements, and our team will review the best path for production.
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.