Flanges & Couplings
Manufacturing of weld-neck, slip-on, and blind flanges plus shaft couplings with close bore-to-face and bolt-circle accuracy using CNC turning and milling.
Get precision-machined flanges, couplings, and related components backed by nearly 60 years of manufacturing experience. M.A.R.'s Engineering delivers tight tolerances, dependable repeatability, and integrated in-house processes that help reduce lead times, simplify sourcing, and support both prototype and production-volume requirements.

Explore core machining and finishing capabilities that support precision flange production from prototype through repeat manufacturing runs.
Manufacturing of weld-neck, slip-on, and blind flanges plus shaft couplings with close bore-to-face and bolt-circle accuracy using CNC turning and milling.
Precision turning for cylindrical parts and flange-related components with consistent dimensional relationships, live tooling support, and capacity for prototype or high-volume work.
4-axis milling and related machining for bolt holes, slots, keyways, flats, and custom features that complete complex flange geometries accurately.
Wire EDM capability for intricate outlines, sharp internal corners, and tooling needs where conventional machining cannot achieve the required detail.
In-house finishing options including zinc, black oxide, nickel, polishing, and powder coating to improve corrosion resistance and part readiness.
Single-source production support that combines machining, finishing, and light assembly to streamline sourcing and reduce multi-vendor delays.
M.A.R.'s Engineering provides precision flange and machine services for customers who need dependable tolerances, efficient production, and fewer handoffs between vendors. With CNC turning, milling, EDM, finishing, and assembly handled in one facility, projects move faster from prototype to production while maintaining traceability, surface quality, and consistent dimensional performance across every run.

See why customers rely on consistent machining quality, responsive service, and dependable production support.
Customers choose M.A.R.'s Engineering for precision, responsiveness, and complete in-house manufacturing support.
Family-owned since 1964, with decades of precision machining knowledge across demanding industrial applications.
Machining, EDM, finishing, and light assembly in one facility reduce delays and simplify project management.
ISO compliant quality systems support traceability, repeatability, and close-tolerance production across every run.
Single-spindle, multi-spindle, CNC, and grinding capabilities support both prototypes and high-volume orders.
Built on decades of machining expertise.
M.A.R.'s Engineering Company Inc. has been a family-run precision manufacturer since 1964, founded by Manuel and Reine Ambrosio with a focus on close-tolerance screw machining. Over the decades, the company expanded its capabilities through multi-spindle equipment, CNC machining, Wire EDM, finishing, and secondary operations to better serve customers needing complete manufacturing support under one roof. That long-term investment in equipment and process control reflects a practical vision: deliver dependable quality, reduce lead times, and make sourcing easier for customers who need prototype parts, repeat production, and high-volume manufacturing from a trusted single-source partner.
Common flange types include weld-neck, slip-on, blind, socket weld, threaded, and lap joint flanges. Each serves a different mechanical or piping requirement based on pressure, alignment, sealing, and installation needs. M.A.R.'s Engineering manufactures precision flange configurations and custom profiles with close control over bore dimensions, bolt-circle accuracy, and machined feature relationships.
Talk with our team about specs, materials, and production needs.
Supporting customers with precision machining services from our San Leandro facility and coordinated production capabilities.
San Leandro, CA
Headquarters
Mon-Fri 8AM-4:30PM
Business Hours
5.0 Google Rating
Customer Rating
Reach out to discuss your machining requirements and timelines.
Supports traceable, repeatable quality processes.
Quality compliance for controlled manufacturing.
Backed by strong customer satisfaction.
Share your part requirements, quantities, materials, and timeline. Our team will review your project and follow up with the next steps.
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.