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Custom Prototype Manufacturing & On-Demand Production

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.

Precision machined prototype parts in a manufacturing facility

Our Custom Prototype Manufacturing & On-Demand Production Services

From prototype parts to scalable production, we provide integrated precision machining and finishing under one roof.

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.

CNC Turning

Manufacture cylindrical parts such as shafts, bushings, fittings, and threaded components with consistent dimensional control across prototype runs and ongoing production schedules.

EDM Machining

Create intricate features, sharp internal corners, and precision tooling in conductive materials where conventional machining cannot achieve the required geometry or repeatability.

CNC Milling

Machine custom parts and prototypes with advanced milling capabilities that support detailed features, efficient setups, and accurate production for industrial applications.

Screw Machining

Support short, medium, and high-volume runs with single-spindle and multi-spindle screw machining for cost-efficient production of precision turned parts.

Finishing Assembly

Complete parts in-house with plating, polishing, deburring, coating, and light assembly services that streamline delivery and reduce outside vendor delays.

Prototype parts moving through precision manufacturing steps

From Prototype to Production

Review drawings and production goals

We evaluate part drawings, tolerances, materials, quantities, and end-use requirements to determine the best manufacturing path for prototypes, bridge runs, or full production.

Select the right machining process

Build prototypes or first articles

Scale into repeatable production

Finish inspect and deliver

Trusted Manufacturing Partner

Success Stories

See how precision machining and integrated production support demanding customer requirements.

"We’ve had an excellent experience working with Mars. Their screw machining capabilities are top‑notch, and the precision of the parts they deliver is consistently impressive. The team is knowledgeable, responsive, and easy to work with, and their experience really shows in the results."

Tom O'Keefe
Tom O'Keefe

"We’ve had an excellent experience working with Mars. Their screw machining capabilities are top‑notch, and the precision of the parts they deliver is consistently impressive. The team is knowledgeable, responsive, and easy to work with, and their experience really shows in the results."

Tom O'Keefe
Tom O'Keefe

"We’ve had an excellent experience working with Mars. Their screw machining capabilities are top‑notch, and the precision of the parts they deliver is consistently impressive. The team is knowledgeable, responsive, and easy to work with, and their experience really shows in the results."

Tom O'Keefe
Tom O'Keefe
The M.A.R.'s Engineering Difference

Why Choose M.A.R.'s Engineering?

Customers rely on us for precision, continuity, and efficient in-house manufacturing support.

Experience

Family-owned since 1964 with decades of precision machining knowledge across complex industrial applications.

Integration

Prototype, machining, finishing, and light assembly stay in one facility for faster project flow.

Scalability

Single-spindle and multi-spindle capacity supports everything from first articles to high-volume runs.

Traceability

ISO-compliant quality systems support documented inspections, consistency, and full production traceability.

About Our Team

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.

5.0 RatingGoogle Business Profile rating based on 4 reviews
Since 1964Family-owned precision manufacturing experience
35 MachinesSingle-spindle screw machines supporting varied production volumes

Frequently Asked Questions

What is custom prototype manufacturing and on-demand production?

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.

Can you handle both prototype quantities and high-volume production runs?

What materials can you machine for custom parts?

What machining processes are available in-house?

How precise are your manufacturing tolerances?

Do you offer finishing and assembly after machining?

What quality standards does M.A.R.'s Engineering follow?

How do I get started with a prototype or production order?

Still Have Manufacturing Questions?

Talk with our team about your part requirements and production goals.

Service Area Coverage

We support customers with precision manufacturing services from our San Leandro facility and regional production capabilities.

San Leandro, CA

Headquarters

Mon-Fri

Schedule

5.0 Reviews

Rating

Need a Manufacturing Partner?

Send us your drawings and production requirements today.

Certified & Trusted

Awards and Recognition

ISO compliant certification badge

ISO Compliant

Supports documented quality and traceability.

Mil-1-45208A compliance badge

Mil-1-45208A Compliance

Quality practices aligned with inspection standards.

Family-owned since 1964 trust badge

Family-Owned Since 1964

Long-standing manufacturing experience and continuity.

Discuss Your Prototype or Production Needs

Share your drawings, quantities, materials, and timeline, and our team will review the best path for precision manufacturing support.

Contact Us Today

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.