OEM Metal Manufacturing Services | Custom Metal Parts

Your Drawings. Our Manufacturing. Reliable Parts at Scale

RHF provides build-to-print OEM metal manufacturing, including CNC machining, sheet metal fabrication, stamping, casting, welding, plastic molding and assembly.

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Built to Your Drawings

Built to Your Drawings, with Consistent Quality from First Article to Volume Production

RHF provides professional OEM/ODM manufacturing services for metal parts. Based on your 2D drawings, 3D files, BOM, physical samples, and technical specifications, we manage DFM review, material sourcing, sample production, volume manufacturing, surface finishing, quality inspection, and component assembly.

Our core capabilities include CNC machining, plastic injection molding, sheet metal fabrication, metal stamping, cutting, bending, die casting, gear machining, and precision welding. We can also integrate plastic parts, wire harnesses, speakers, and final assembly to reduce supplier count and simplify global sourcing.

Custom Metal Parts and Structural Components

Plastic and Electronic Component Integration

End-to-End Quality Control and Traceability

Global Packaging and Delivery Support

OEM & ODM

What Are OEM and ODM Manufacturing Services?

OEM Manufacturing

OEM manufacturing is ideal for customers with completed product designs and approved drawings, CAD models, 3D files, BOMs, or technical specifications. We convert the approved design into stable, repeatable metal parts or complete assemblies. Materials, tolerances, surface finishes, functional requirements, and inspection criteria are confirmed before production and carried through to volume manufacturing after sample approval.

You retain ownership of your product design and brand. As your contract manufacturing partner, RHF manages engineering review, production execution, quality control, and delivery.

ODM Manufacturing

In ODM manufacturing, the manufacturer participates in product development and design engineering. Customers may provide only a product concept, application, functional requirements, target cost, or reference sample. RHF can support structural design, material selection, DFM analysis, prototype validation, mold and tooling development, volume production, and assembly, turning an initial concept into a manufacturable, testable, and production-ready product.

Manufacturing Scope

Precision Manufacturing Services from Product Requirements to Volume Delivery

Manufacturing to Approved Drawings and Technical Specifications

We manufacture to customer-approved drawings, 3D CAD files, BOMs, GD&T requirements, tolerances, material specifications, and surface finishing requirements.

Before the project begins, we confirm the drawing revision and part number; material grade and restrictions on substitutions; critical dimensions and special tolerances; surface roughness and cosmetic standards; heat treatment and surface finishing requirements; assembly, functional, and testing requirements; and packaging, labeling, and traceability requirements. We never alter a technical requirement that may affect function, fit, or quality without customer approval.

Engineering Review

Pre-Production DFM Engineering Review

Before production, we evaluate manufacturability, cost, and potential risks.

DFM review typically covers material suitability for the intended application, tolerance compatibility with the selected process, manufacturability of thin walls, deep cavities, and complex features, risk of distortion from bending, welding, or heat treatment, the effect of surface finishing on critical dimensions, potential assembly interference, and opportunities for process-driven cost reduction. If changes are recommended, we explain the reason, impact, and proposed solution before implementing them with customer approval.

Complete Metal and Plastic Manufacturing Capabilities

RHF selects the appropriate manufacturing process based on part geometry volume precision requirements and cost targets

Precision CNC Machining

CNC milling, turning, drilling, tapping, and multi-axis machining for shafts, flanges, connectors, heat sinks, valve bodies, equipment parts, and complex metal or plastic components.

Sheet Metal Fabrication

Laser cutting, CNC punching, press brake bending, welding, riveting, and assembly for enclosures, housings, chassis, control cabinets, mounting plates, frames, brackets, and other sheet metal parts.

Metal Stamping

Single-stage, compound, and progressive stamping for terminals, spring contacts, connector plates, shielding covers, brackets, and high-volume hardware components.

Casting and Die Casting

Aluminum, zinc, and other metal casting and die casting with CNC finishing and surface treatment for complex housings, thermal management structures, motor housings, and industrial equipment parts.

Gears and Precision Transmission Components

Custom spur, helical, and bevel gears, shafts, and other precision transmission parts with optional heat treatment and precision grinding.

Metal Welding and Assembly

TIG, MIG/MAG, laser, and robotic welding plus mechanical assembly, with close control of structural strength, weld distortion, sealing performance, and assembly accuracy.

Plastic and Multi-Material Manufacturing

For OEM projects combining metal and plastic components, RHF provides injection mold development, plastic injection molding, insert molding, overmolding, and decorative finishing. Typical products include metal enclosures with plastic panels, aluminum housings with plastic insulators, metal terminals with molded connectors, metal brackets with overmolded grips, die-cast housings with plastic sealing features, and metal frames with protective plastic covers.

Production Scale

From Prototypes to Volume Production

RHF supports OEM/ODM programs at every production stage: rapid prototyping and design validation, engineering samples, first articles and pilot runs, mid-volume production, long-term high-volume supply, and spare or repeat orders. After sample approval, we retain the approved drawing revision, material requirements, process parameters, inspection criteria, and reference samples to maintain consistency across future batches and repeat orders.

End-to-End Quality Control

RHF integrates quality management throughout the manufacturing process, not only at final inspection

Commercial Reliability

Cost Optimization and Reliable Supply

Based on projected volume, product lifecycle, and annual purchasing plans, we help customers select the right manufacturing strategy.

Cost optimization measures include selecting a process suited to volume; reviewing unnecessarily tight tolerances; reducing repeated setups and secondary operations; improving material utilization; integrating surface finishing and assembly; optimizing molds, fixtures, and inspection gauges; and planning raw materials and capacity against forecasts.

Our goal is not simply the lowest unit price, but the right balance of quality, lead time, manufacturing risk, and total procurement cost.

Project Protection

Intellectual Property and Project Confidentiality

RHF respects and protects customer product designs, drawings, technical data, and business information.

We can sign an NDA before project launch and manage product drawings and 3D CAD files, BOMs and technical specifications, mold and tooling data, samples and test results, quotation and purchasing information, and customer branding and packaging materials in accordance with agreed confidentiality requirements.

Engineering Problem Solving

How RHF Solves Critical Metal Manufacturing Challenges

Metal parts sourcing involves more than price. It also requires accurate drawing control, process selection, dimensional precision, supplier coordination, batch consistency, and reliable long-term delivery. Through engineering review, multi-process integration, end-to-end quality control, and clear project management, RHF helps reduce risk from sample development through volume production.

Manufacturing ChallengePotential ImpactRHF Solution

Drawing Revisions and Engineering Changes Are Prone to Error

Potential Impact OEM programs often involve multiple drawing revisions and engineering changes. Manufacturing to an obsolete revision can make an entire batch unusable and disrupt the customer’s assembly and delivery schedule.

RHF Solution We use a controlled drawing revision and Engineering Change Notice (ECN) process. When a new revision is received, we promptly communicate with the customer and evaluate its impact on inventory, work in progress, molds, fixtures, machining programs, cost, and lead time before implementation.

Maintaining Consistent Surface Finish and Color

Potential Impact Anodizing, plating, powder coating, painting, and brushing may produce color variation, uneven coating thickness, scratches, inadequate adhesion, or changes to critical assembly dimensions, potentially affecting brand presentation.

RHF Solution Before production, we define color, gloss, texture, coating thickness, masking areas, and cosmetic acceptance criteria with the customer. We also include appropriate finishing allowance on critical dimensions. For volume orders, approved reference samples can be used for comparative inspection.

Costs Are Difficult to Control and Quotes Lose Long-Term Competitiveness

Potential Impact Overly tight tolerances, material waste, repeated setups, complex secondary operations, and inefficient process planning all increase part cost. A low-price supplier may also reduce inspection or use inconsistent materials, creating greater quality risk.

RHF Solution We conduct a comprehensive review of material, geometry, tolerances, process route, fixturing, surface finishing, and projected volume, then recommend manufacturable cost optimizations.

Approved Samples, but Inconsistent Volume Production

Potential Impact A sample may perform well, while volume production later shows dimensional variation, weld distortion, increased burrs, color shift, or inconsistent surface finishing.

RHF Solution After sample approval, we retain and control the approved drawing revision, material requirements, process parameters, inspection standards, and reference samples. First article inspection, in-process checks, critical dimension monitoring, and final inspection help maintain batch-to-batch consistency.

Parts Meet Specification, but the Final Assembly Does Not Fit

Potential Impact Individual parts may be within tolerance, yet the assembly can still develop gaps, interference, misalignment, or looseness due to inconsistent datums, tolerance stack-up, weld distortion, or different shrinkage behavior between metal and plastic.

RHF Solution Before production, we review the tolerance stack, assembly relationships, and locating datums, then verify critical fit dimensions at the first article stage. For metal-plastic assemblies, we also assess material shrinkage, thermal expansion, and fastening design.

The Design Works, but Is Difficult to Manufacture Consistently

Potential Impact A design may be functionally sound yet include overly tight tolerances, thin walls, deep cavities, complex welds, impractical bend locations, or inaccessible internal features. These issues can increase cost, extend lead time, or prevent scalable production.

RHF Solution We conduct DFM analysis before production, reviewing materials, geometry, tolerances, machining datums, surface finishing, and assembly requirements. We then recommend manufacturing improvements that preserve the product’s intended function.

Unsure Which Manufacturing Process to Choose

Potential Impact The same metal part might be CNC machined, fabricated from sheet metal, stamped, die-cast, or welded. Choosing the wrong process can lead to excessive unit cost, unjustified tooling investment, or inadequate product performance.

RHF Solution We compare manufacturing options based on part geometry, material, tolerance, projected volume, and target cost, then recommend the process best suited to prototyping, low-volume production, or high-volume manufacturing.

One-Stop OEM Solutions Centered on Precision Metal Manufacturing

Turning Your Drawings into Metal Products You Can Source Reliably

Producing one qualified sample is only the starting point. What truly determines purchasing success is whether a supplier can consistently reproduce the same standards for materials, dimensions, surface quality, and delivery.

With precision metal manufacturing at the core, RHF converts customer-approved drawings, BOMs, and technical specifications into an executable, verifiable, and traceable production plan. From first article validation through volume delivery, every critical requirement is supported by defined manufacturing instructions and quality records.

Engineering Designs for Stable Production

After receiving your project information, we first confirm product function, materials, tolerances, critical-to-quality characteristics, and projected volume, then develop the appropriate manufacturing route.

Based on part geometry and purchasing volume, RHF can integrate CNC machining, sheet metal fabrication, metal stamping, cutting, bending, die casting, gear machining, precision welding, and surface finishing. Our engineers identify details that may create machining difficulty, weld distortion, finishing interference, or unnecessary cost and provide DFM recommendations that improve manufacturability without changing product function.

Make the Approved First Article the Standard for Every Batch

The value of an OEM program is ultimately measured by repeatable production.

After sample approval, RHF incorporates the confirmed drawing revision, material requirements, process parameters, critical dimensions, cosmetic reference samples, and inspection methods into production controls.

From low-volume pilot runs to long-term volume supply, we use first article inspection, in-process monitoring, engineering change control, and pre-shipment verification to minimize variation across time, batches, and manufacturing processes.

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