OEM Stainless Steel CNC Turned and Milled Parts Supplier
Overview
XCM CNC provides OEM stainless steel CNC turning and milling for build-to-print parts, with grade review across 304, 316, and 316L based on media exposure, corrosion resistance, and assembly conditions.
During DFM review, passivation, polishing, sealing faces, and O-ring groove requirements can be aligned before sample approval and repeat production. This route fits chemical fluid fittings, instrument housings, and non-implant medical structure parts, with ISO 9001, ISO 13485, IATF 16949, and GJB9001C systems in place and MOQ starting from 1 piece.
Key Capabilities
Machining Parameters and Tolerances
- Materials: Stainless Steel 304, 316, 316L
- Tolerance: +/-0.003 mm (+/-0.00012 inch), IT5 or IT6 accuracy, +/-0.01 mm shaft/bore fits; h6/H7 available
- Surface Finish: Ra 3.2 um milled, Ra 0.8 um turned, Ra 0.4 um ground, Ra 0.2 um polished
- GD&T: Flatness 0.02 mm, concentricity 0.012 mm, position 0.015 mm, cylindricity 0.011 mm, circular runout 0.01 mm
- Max Size: 3-axis milling 3000 x 1600 x 1400 mm; turning diameter 1200 x 2500 mm
- Surface Treatment: Passivation (ISO 15734), bead blasting 80#-220#, polishing (mirror/bright/matte)
- Thread: Internal M1.4 min, external M2.0 min, max M220; NPT/BSP/G/PT pipe threads; depth 4xD
- Inspection & Reporting: CMM report, FAI (customer format), material certificate, passivation report, dimensional inspection per drawing
Assembly Fit Tolerance for Stainless Steel OEM Components
Assembly fits on stainless steel OEM parts usually focus on bearing seats, sealing diameters, and locating bores. Shaft diameters can be reviewed to h6 around +/-0.005 mm, bores to H7 around +/-0.006 mm, and mating-surface roughness around Ra 0.8 um. For stepped diameters and coaxial features, concentricity can be controlled around 0.012 mm when datum selection and single-clamping strategy are confirmed in advance.
Multi-Process Turning and Milling for OEM Stainless Assemblies
OEM stainless assemblies often combine turning, milling, drilling, tapping, and multi-side machining in one route. Three-axis milling travel reaches 3000 x 1600 x 1400 mm, five-axis work can support complex surfaces within about 800 x 600 x 900 mm, and turning diameter can reach 1200 mm over lengths up to 2500 mm. This makes the route suitable for flanges, sleeves, housings, and connector bodies that need complete machining in one workflow.
GD&T Control on Sealing Faces and Locating Features
GD&T callouts on OEM drawings directly affect fixturing and inspection planning. Flatness can be held around 0.02 mm, position around 0.015 mm for hole groups, circular runout around 0.01 mm for rotating fits, and perpendicularity around 0.02 mm over 1000 mm on multi-face housings and flanges. Sealing faces, O-ring grooves, and locating bores are reviewed together so that geometry and surface condition stay aligned.
Inspection Documentation for Stainless Steel OEM Deliveries
OEM stainless orders can include FAI reports, CMM inspection records, material certificates, and passivation reports in the delivery package. Threads are checked with go and no-go gauges or ring gauges, while Hexagon CMM and 2.5D optical measurement are used for position, coaxiality, and profile verification on critical features.
Specifications
| Product Name | OEM Stainless Steel CNC Turned and Milled Parts |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | CNC turning, CNC milling, turn-mill machining |
| Material | Stainless Steel |
| Material Grade | 304, 316, 316L, 303 by medium and drawing requirement |
| Precision Tolerance | +/-0.003 mm for selected small precision features after review |
| Surface Roughness | Ra 1.6 um machined surfaces, Ra 0.8 um sealing faces by requirement |
| Surface Treatment | Passivation, polishing, bead blasting by drawing and sample approval |
| Inspection | Dimensional inspection, thread gauge, CMM for critical features by order requirement |
| Application | Chemical fluid fittings, marine hardware joints, instrument housings, non-implant medical structures |
| Key Features | Sealing faces, O-ring grooves, threaded joints, weld-finish features, multi-side holes |
| Critical QC Requirements | Sealing face roughness, groove depth, thread standard, post-passivation recheck |
| Batch Range | Prototype to repeat OEM batches by drawing review |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
| Material Certificate | Material certificate and passivation report by order requirement |
Applications
Chemical Fluid Valve Bodies and Pump Fittings
Typical Parts: Stainless steel valve body, pump housing connector
Grades such as 304, 316, and 316L suit build-to-print fluid components that need corrosion resistance and stable sealing faces. The sample stage can confirm O-ring grooves, thread standards, and passivation before the grade and machining route are fixed for production.
Marine Corrosion-Resistant Mounts and Pipe Connectors
Typical Parts: Marine mounting bracket, pipe connector
Marine assemblies usually place more emphasis on the corrosion performance of 316L and consistency after surface treatment. Sample review can confirm fit dimensions, passivation condition, and visible-surface standards before repeat orders are released.
Instrument Housings and Precision Fittings
Typical Parts: Sensor housing, precision fitting
Stainless steel fits instrument parts that need corrosion resistance, thread stability, and local polishing. Drawing review can lock file formats, hole relationships, and surface-roughness targets early so that later revision risk is reduced.
Non-Implant Medical Structures and Sterilization Hardware
Typical Parts: Sterilization tray, equipment structural bracket
For non-implant medical structures, stainless steel supports corrosion resistance, cleanability, and passivation. Sample review can confirm bends, post-weld finish steps, and surface-treatment expectations before the route moves into low-volume or repeat production.
Why Choose Us
Certified Systems and Inspection Resources
XCM CNC operates under ISO 9001, ISO 13485, IATF 16949, and GJB9001C quality systems and uses machining centers from brands such as DMG, Mazak, Matsuura, and Brother, supported by Hexagon CMM and 2.5D optical inspection.
Quote Review Covers Grade, Media, and Sealing Requirements Early
During quotation and DFM review, STEP, DWG, and dimensioned PDF files are checked together with grade, media exposure, and sealing requirements. Passivation, polishing, O-ring grooves, and post-weld finish needs are included in the scope at the start, which reduces later clarification loops.
Sample Approval Locks Surface Standards Before Batch Release
The sample stage can confirm passivated, natural, polished, or mirror-like surface expectations before batch routing is finalized. Once appearance, corrosion resistance, and assembly-face standards are approved, repeat production follows the same confirmed condition.
Revision History Stays Traceable
OEM stainless projects often involve drawing revisions, thread changes, and sealing-structure updates. Version records keep the modified features and matching inspection criteria aligned so that outdated drawings or old surface rules do not continue into production.
Sealing Structure Requirements Are Clarified Before Machining
For parts with sealing faces, quotation and DFM review confirm the inspection method and acceptance criteria before machining starts. Deburring scope, roughness check locations, and assembly direction can therefore be aligned before the part reaches the assembly stage.
Passivation and Batch Reinspection Stay Connected
After passivation or electropolishing, appearance sampling and dimensional rechecks can follow the plan agreed during sample review. The same review scope is carried into batch delivery so that reports and outgoing inspection remain consistent.
FAQ
What drawing files do you need for custom stainless steel turned and milled parts?
Quotation and review usually need STEP, IGES, STP, DWG, or a dimensioned PDF together with grade, quantity, key tolerances, and media notes. If the part includes O-ring grooves, sealing faces, post-weld finish, or polishing, those priorities should be marked at inquiry stage.
What is the typical process from inquiry to sample approval for stainless steel OEM parts?
The usual route is drawing submission, quotation with DFM feedback, confirmation of grade and surface-treatment plan, sample machining, inspection, and customer approval before batch scheduling. Sample lead time is commonly reviewed in the 10-15 working day range, depending on geometry complexity and surface-treatment needs.
How do you handle the transition from sample to batch production for stainless steel parts?
After sample approval, machining parameters, tool paths, inspection methods, and surface-treatment standards are locked for batch release. If the customer changes a requirement later, the affected operations and inspection items are reviewed again before the new batch is launched.
What inspection reports can you provide with stainless steel OEM shipments?
Standard support includes dimensional inspection records and material certificates. When required, CMM reports, thread gauge records, roughness data, and passivation reports can also be included, with the exact scope agreed during order confirmation.
How do you manage design changes on stainless parts after sample feedback?
When sample feedback changes hole locations, threads, sealing faces, or surface treatment, the drawing and inspection requirements are reconfirmed by revision. Changes that affect sealing or assembly function are better rechecked through another sample or a small verification batch.
Can you machine welded stainless components after fabrication?
Yes, post-weld finish machining can be reviewed against the drawing, but weld condition, rebuilt datums, and follow-up surface treatment need to be clarified first. Stainless welded structures also need attention to distortion, weld cleanup, and reinspection planning.
Request a CNC Machining Quote from XCM CNC
Send us your drawings. Our team will review the file and reply with a machining quote. MOQ: 1 piece, with competitive low-cost pricing.
Email: [email protected] | WhatsApp: +8618638951317
