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Precision CNC Machined Stainless Steel 304 Medical Grade Pump Body for Fluid Transfer System
Product Overview
A pump body that handles saline at 80 psi and doesn't pit after 200 autoclave cycles — that's the real test, not some tensile strength number on a data sheet. We've made hundreds of these for fluid handling OEMs, and the failure mode is almost always the same: porosity in the castings they were using before switching to our CNC-machined version.
Here's the thing about 304 pump bodies. The internal passages are the hard part. You've got intersecting bores, threaded ports at weird angles, and a sealing surface that needs to be flat to within 0.02mm while the rest of the body holds pressure. If your shop is doing this on a 3-axis and flipping the part six times, you're asking for datum drift. We run these on 4-axis machines — top features, port bores, and the main chamber in one setup. The second setup handles the bottom flange and outlet port. Two setups, one datum system.
304 machines slower than aluminum — everyone knows that. But the real cost driver is tool wear. We use coated carbide inserts with high-pressure coolant (70 bar) to keep the cutting zone clean and extend tool life by 3-4x. That matters when you're running 500 pump bodies and don't want to change inserts every 20 parts.
Key Features
Solid Billet Construction: No casting porosity, no sand inclusions, no surprise leaks during pressure testing — just dense, homogeneous 304 from certified mill stock
Intersecting Bore Accuracy: Cross-drilled fluid passages aligned within 0.02mm, no step or misalignment at intersections that creates turbulence
Autoclave-Ready Finish: Ra 0.8 or better on all fluid-contact surfaces, meets ASME BPE surface finish requirements for sanitary applications
Single-Datum Machining: All critical features referenced to Datum A (mounting face) and Datum B (main bore) — built in two setups max to eliminate datum shift
Pressure Tested: Every unit hydro-tested at 1.5x working pressure before shipping, no exceptions
Technical Specifications
Specification
Details
Product Name
Precision CNC Machined Stainless Steel 304 Medical Pump Body
Material Options
Stainless Steel 304 (standard), SS 316L (chloride environments), SS 316 (high purity fluid)
Fluid Handling OEMs: Centrifugal pump bodies for water treatment, chemical dosing, and general industrial fluid transfer
Laboratory Equipment: Peristaltic and diaphragm pump housings for analytical instruments and sample handling systems
Food and Beverage Processing: Sanitary pump bodies for dairy, brewing, and food ingredient handling where CIP (clean-in-place) compatibility is required
Biotech and Life Sciences: Process pump housings where surface finish and material traceability are non-negotiable audit requirements
Industrial Cooling Systems: Chiller pump bodies and heat exchanger housings that run 24/7 in harsh environments
Agricultural Spraying Systems: Pump bodies for pesticide and fertilizer dispensing that see abrasive chemicals daily
Why Choose Sinbo Precision
In-house high-pressure coolant (70 bar): 304 eats tools fast without it. Our 70-bar through-spindle coolant keeps inserts alive 3-4x longer on your pump body bores
Two-setup manufacturing strategy: Most shops need 5-6 setups for a pump body with intersecting ports. We do it in two, which means tighter tolerances and lower cost
Full material traceability: Mill certificates for every heat of 304, with batch tracking from raw material to finished part
Hydro-test before shipment: We pressure-test every pump body at 1.5x your rated pressure. If it leaks here, you never see it
632 employees, 34,000 sqm factory: We've got the capacity for your 50-piece pilot run and your 10,000-piece annual blanket order
ISO 9001 + IATF 16949: Automotive-grade process control applied to your pump bodies. That's a higher bar than most fluid handling shops hold themselves to
Manufacturing Process
Drawing Review & DFM Analysis: We map out the setup strategy, verify wall thickness between intersecting bores (minimum 1.5mm), and check for tool access issues on angled ports
Material Sourcing & Verification: 304 round bar or forged blank per your spec, mill test certificate verified against ASTM A240/A276
CNC Machining (4-axis): Setup 1 — main bore, chamber, threaded inlet ports, datum face. Setup 2 — outlet port, bottom flange, mounting holes. All critical dimensions to datum A-B
Deburring & Surface Finishing: Internal passage edges hand-finished to prevent turbulence. External surfaces bead blasted or electropolished per spec
Passivation & Cleaning: ASTM A967 nitric acid passivation, DI water rinse, dried in clean environment to prevent water spots
Hydro-Test & Final Inspection: 1.5x rated pressure for 60 seconds, CMM on sealing surfaces and bore concentricity, packaged with protective caps on all ports
Frequently Asked Questions
Q: Why machined from billet instead of investment casting?
A: Castings have porosity. Even a "good" investment casting has microscopic voids that become leak paths under pressure or cause surface finish issues in fluid-contact areas. CNC machining from solid billet gives you zero porosity and consistent mechanical properties throughout. Cost is higher per piece, but your warranty claims drop to near zero.
Q: Can you do electropolishing for a mirror finish?
A: Yes, we work with a qualified electropolish partner. Ra 0.4 is achievable on internal bores. The tricky part is protecting threaded ports during the electropolish process — we mask them. Add 3-4 days to lead time for electropolishing.
Q: What's the minimum wall between two intersecting bores?
A: We recommend 1.5mm absolute minimum, 2mm for anything seeing pressure above 10 bar. Below 1.5mm you risk breakthrough during machining or a thin wall that flexes under hydraulic cycling. If your design has intersecting bores closer than that, let's talk about boring one first and drilling the cross-hole second — the sequence matters.
Q: Do you support cold water shock testing?
A: We can accommodate it as a special inspection step. We'll cycle the part between hot (80C) and cold (5C) fluid for your specified number of cycles and check for distortion or cracks. Extra charge, extra lead time — talk to us about your test protocol.
Q: How do you handle the angled port threads?
A: We use 4-axis positioning to tilt the workpiece and cut the threads with a single-point thread mill. This gives us perfect thread angle relative to the bore axis, which you can't get with a rigid tap on an angled hole.
