Swiss Machining
Produce small, complex components with exceptional accuracy using Swiss-type CNC equipment suited for tight tolerances, intricate geometries, and both prototype and repeat production quantities.
M.A.R.'s Engineering delivers precision prototype manufacturing and scalable on-demand production from a single California facility. From first-run parts to repeat production, customers get tight tolerances, faster turnaround, and fewer vendor handoffs through integrated machining, finishing, and assembly capabilities built for demanding industrial applications.

From prototype parts to scalable production, we provide integrated precision machining and finishing under one roof.
Produce small, complex components with exceptional accuracy using Swiss-type CNC equipment suited for tight tolerances, intricate geometries, and both prototype and repeat production quantities.
Manufacture cylindrical parts such as shafts, bushings, fittings, and threaded components with consistent dimensional control across prototype runs and ongoing production schedules.
Create intricate features, sharp internal corners, and precision tooling in conductive materials where conventional machining cannot achieve the required geometry or repeatability.
Machine custom parts and prototypes with advanced milling capabilities that support detailed features, efficient setups, and accurate production for industrial applications.
Support short, medium, and high-volume runs with single-spindle and multi-spindle screw machining for cost-efficient production of precision turned parts.
Complete parts in-house with plating, polishing, deburring, coating, and light assembly services that streamline delivery and reduce outside vendor delays.

We evaluate part drawings, tolerances, materials, quantities, and end-use requirements to determine the best manufacturing path for prototypes, bridge runs, or full production.
See how precision machining and integrated production support demanding customer requirements.
Customers rely on us for precision, continuity, and efficient in-house manufacturing support.
Family-owned since 1964 with decades of precision machining knowledge across complex industrial applications.
Prototype, machining, finishing, and light assembly stay in one facility for faster project flow.
Single-spindle and multi-spindle capacity supports everything from first articles to high-volume runs.
ISO-compliant quality systems support documented inspections, consistency, and full production traceability.
Built on decades of family-run manufacturing experience.
M.A.R.'s Engineering Company Inc. was founded in 1964 by Manuel and Reine Ambrosio and has remained a family-run precision manufacturing business ever since. Over the decades, the company expanded its capabilities through new equipment, a second operations department, multi-spindle capacity, CNC machining, and in-house Wire EDM. That steady investment has allowed M.A.R.'s Engineering to support customers from prototype development through repeat production without relying on multiple outside vendors. Today, the company continues to focus on close-tolerance machining, dependable turnaround, and responsive service for industries where consistency, traceability, and production efficiency matter most.
Custom prototype manufacturing focuses on producing initial parts for testing, validation, and design refinement, while on-demand production supports repeat orders as quantities increase. M.A.R.'s Engineering handles both within one facility, helping customers move from first articles to scheduled production using CNC turning, Swiss machining, EDM, milling, finishing, and light assembly without changing vendors.
Talk with our team about your part requirements and production goals.
We support customers with precision manufacturing services from our San Leandro facility and regional production capabilities.
San Leandro, CA
Headquarters
Mon-Fri
Schedule
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Send us your drawings and production requirements today.
Supports documented quality and traceability.
Quality practices aligned with inspection standards.
Long-standing manufacturing experience and continuity.
Share your drawings, quantities, materials, and timeline, and our team will review the best path for precision manufacturing support.
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.