EDM Tooling
Wire EDM supports custom aerospace tooling with sharp internal corners, intricate profiles, and hardened material machining for precise dies, fixtures, and specialty tool components.
M.A.R.'s Engineering delivers custom aerospace tooling design and manufacturing with the precision, traceability, and fast in-house support demanded by flight-critical programs. From prototype tooling to production-ready components, our San Leandro facility combines EDM, CNC, Swiss machining, and finishing to help aerospace teams reduce lead times, maintain tight tolerances, and keep complex projects moving.

Integrated in-house machining and tooling support for aerospace prototypes, custom fixtures, and production-ready precision components.
Wire EDM supports custom aerospace tooling with sharp internal corners, intricate profiles, and hardened material machining for precise dies, fixtures, and specialty tool components.
Swiss screw machining produces small, complex tooling parts with ultra-tight tolerances, making it ideal for aerospace pins, inserts, spacers, and high-aspect-ratio components.
CNC turning delivers accurate cylindrical tooling components such as bushings, shafts, fittings, and threaded parts with strong repeatability from prototype through production.
4-axis CNC milling creates custom tooling bodies, machined blanks, and detailed aerospace components requiring multi-face machining and efficient feature completion.
Centerless grinding achieves fine finishes and diameter tolerances down to 0.0001 inches for tooling pins, sleeves, and cylindrical aerospace components.
In-house finishing, plating, polishing, and light assembly help deliver aerospace tooling components ready for installation, corrosion resistance, and functional performance.

We evaluate part drawings, tolerances, materials, and functional requirements to determine the best tooling approach. This early review helps aerospace customers avoid manufacturability issues and align tooling performance with inspection and traceability expectations.
Trusted machining and tooling support for demanding aerospace and high-tolerance manufacturing applications.
Aerospace customers rely on us for precision, responsiveness, and integrated in-house manufacturing support.
Family-owned since 1964, with decades of precision machining knowledge for complex aerospace tooling work.
EDM, CNC, grinding, and finishing in San Leandro reduce vendor handoffs and lead-time risk.
ISO-compliant quality systems support dimensional consistency, documentation, and dependable production repeatability.
We support prototypes through high-volume runs for Bay Area aerospace and advanced manufacturing customers.
Built on decades of machining expertise.
M.A.R.'s Engineering has been a family-run precision manufacturer since 1964, founded by Manuel and Reine Ambrosio and grown through steady investment in people, equipment, and in-house capability. Based in San Leandro, we support demanding industries with close-tolerance machining, custom tooling, and complete manufacturing services from prototype through production. Over the years, the company expanded with multi-spindle capacity, a CNC department, and Wire EDM to improve quality control and toolmaking responsiveness. That long-term commitment matters in the Bay Area, where aerospace and advanced manufacturing customers need dependable turnaround, traceability, and consistent communication. Our vision is simple: deliver precise, efficient, single-source manufacturing that helps customers reduce delays, control quality, and keep critical projects on schedule.
M.A.R.'s Engineering manufactures custom aerospace tooling components such as pins, bushings, sleeves, inserts, connectors, shafts, and other precision-machined parts used in fixtures, assemblies, and production tooling. With EDM, Swiss machining, CNC turning, milling, and grinding in-house, the shop can support intricate geometries, hardened materials, and close-tolerance features required for aerospace applications.
Talk with our team about tooling requirements and timelines.
Supports documented quality and traceability.
Aligned with inspection system requirements.
Long-standing precision manufacturing experience.
Share your drawings, tolerances, materials, and production goals. Our team will review your requirements 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.