Sealed CNC Machined Stainless Steel Pump Housing
Fully machined stainless steel pump housings with precision-machined volute profiles, impeller chambers, seal cavities, and mounting flanges produced in a single CNC setup for guaranteed concentricity. Suitable for centrifugal, gear, diaphragm, and sanitary pumps. Available in 304, 316/316L, 2205 duplex, and CF8M cast stainless with optional electropolishing, passivation, and hydrostatic testing. Max envelope 800 × 600 × 500 mm.
Manufacturing Processes :
CNC turning (multi-axis with live tooling), CNC milling (3/4/5-axis), cylindrical grinding, centerless grinding, honing, thread cutting, broaching, drilling & tapping, EDM wire-cut (partner)Heat Treatment :
Quench & temper | Case hardening / carburizing | Induction hardening | Solution annealing | Vacuum hardening | Nitriding | Stress relieving. Every heat treatment batch ships with time–temperature chart and hardness report.Surface Treatment :
Zinc plating (clear/yellow passivation) | Zinc-nickel alloy | Electroless nickel | Hard chrome plating | Black oxide | Phosphating (MnPO4) | Passivation (ASTM A967) | Electropolishing | Anodizing (aluminum) | Powder coatingCustomizable :
YesOrder(MOQ) :
Prototype: 1–10 pcs (no MOQ for billet-machined parts). Small batch: 10–500 pcs. Series production: 500–50,000+ pcs/month.Specifications
Shengtao's sealed CNC machined stainless steel pump housings are produced from solid billet or pre-qualified cast blanks on multi-axis CNC machining centers, with all critical features — the volute or impeller chamber profile, the mechanical seal cavity bore, the suction and discharge port faces, the mounting flange, and all bolt holes — machined in a single integrated setup from a common datum. This single-setup approach is the foundation of pump housing quality because it guarantees that the seal cavity, the impeller chamber, and the port flanges share a common centerline and face relationship to within 0.02 mm concentricity, which directly determines how quietly and reliably the pump will run. When the seal cavity is even slightly eccentric to the impeller chamber, mechanical seal life is dramatically reduced and bearing loads increase — problems that are prevented before they start by our unified machining methodology.
The stainless steel grade is selected to match the pumped fluid and operating environment. 304 is suitable for clean water, low-chloride process fluids, and general industrial service. 316/316L is the standard for chemical, marine, and wastewater applications where chloride pitting resistance is required. Duplex 2205 is increasingly specified for high-pressure multistage pumps, offshore firewater pumps, and desalination high-pressure pumps because its roughly doubled yield strength allows a thinner, lighter housing for the same pressure rating. CF8M (cast 316 equivalent) is used when the housing geometry favors a casting followed by finish machining of critical surfaces. For sanitary and pharmaceutical pump housings where surface finish and cleanability are paramount, we electropolish all wetted surfaces to Ra ≤0.8 µm — the standard required for 3-A sanitary compliance and EHEDG cleanability certification.
The seal cavity is the highest-precision feature of any pump housing. It is bored to H7 tolerance, faced perpendicular to the bore axis, and surface-finished to Ra 0.4–0.8 µm to provide the ideal surface for mechanical seal seating. Gasket sealing faces on flanges are machined to a serrated (phonographic) finish of Ra 3.2–6.3 µm per ASME B16.5 for standard fiber gaskets, or to a smooth Ra 1.6 µm face for O-ring seals. Every housing is dimensionally inspected on CMM, with the seal cavity-to-impeller-chamber concentricity verified as a mandatory pass/fail criterion. Optional hydrostatic shell testing at 1.5× design pressure provides documented evidence of casting or billet integrity and leak-tightness. Contact us with your pump housing drawing for a quotation within 24 hours.
Sealed CNC Machined Stainless Steel Pump Housing is one of our core strength products. We maintain substantial inventory to ensure rapid delivery and can also customize extra-large diameter seamless pipes according to your specific requirements. Additionally, we provide comprehensive services including spectroscopic analysis, mechanical property testing, pressure testing, and non-destructive testing (NDT).
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Note: If you do not find a Sealed CNC Machined Stainless Steel Pump Housing that meets your requirements or is suitable for your customer’s project, please contact our manager sales consultant (Email: stsalesman4@stmetal001.com) and send us your specifications and technical parameter files to obtain Customized quotation plan. |
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FAQs
Q: What machined parts and fabrication services does Shengtao provide?
Shengtao is a China-based, ISO 9001-certified one-stop manufacturer delivering precision-machined and fabricated metal parts across 10 product categories:
• CNC Precision Machined Parts — turned, milled, and 5-axis complex components
• Stamped & Formed Metal Parts — progressive die stamping, deep drawing, sheet metal fabrication
• Welded & Fabricated Steel Assemblies — structural weldments, pressure vessel shells, pipe spools
• Hydraulic & Pneumatic Components — honed cylinder barrels, chrome-plated piston rods, valve bodies
• Automotive Precision Parts — drivetrain, suspension, steering, and engine components
• Surface-Treated Steel Parts — mirror polishing, electropolishing, hard chrome, zinc/nickel plating
• Precision Tube & Pipe Machined Parts — tube end machining, honing, pipe spool assemblies
• Laser Cut & Waterjet Cut Parts — precision 2D profiles up to 150 mm thick
• Machined Pipe & Tube Fittings — threaded fittings, forged flanges, custom connectors
• Special Alloy & High-Performance Parts — Inconel, Hastelloy, Titanium, tool steel components
We work from your drawings, providing customized parts — we do not sell standardized off-the-shelf items. Send your RFQ with a drawing to start a quotation.
Q: Can you manufacture custom parts from my engineering drawings? What file formats do you accept?
A: Yes — custom manufacturing to your drawings is our core business. We accept:
• 2D drawings: PDF, DWG, DXF
• 3D models: STEP (.stp), IGES (.igs), SolidWorks (.SLDPRT / .SLDASM), CATIA, Inventor
The process is straightforward:
1. Send your drawing/model with material specification, quantity, and any special requirements.
2. We sign an NDA before reviewing your files.
3. Our engineering team performs a DFM (Design for Manufacturability) review and flags any concerns.
4. We send a formal quotation with price, lead time, and technical notes within 24–48 hours.
We handle everything from raw material sourcing through machining, heat treatment, surface finishing, inspection, and export packaging — delivering parts ready for your assembly line.
Q: What materials can you source and machine for my parts?
A: We source and machine a comprehensive range of metals, all with certified mill test reports (MTR):
Stainless steel: 303, 304, 316, 316L, 321, 410, 420, 430, 2205, 2507 (duplex/super duplex)
Carbon steel: A36, 1020, 1045, A105, A106 Gr.B, API 5L X42–X80, S235, S355
Alloy steel: 4140, 4340, 8620, 42CrMo4, 34CrNiMo6, 20CrMnTi, A387 Gr.11/22
Aluminum: 6061-T6, 7075-T6, 5052, 5083
Tool steel: D2, H13, M2, P20, S7
Nickel alloys: Inconel 600/601/625/718, Hastelloy C-276/C-22, Monel 400
Titanium: Grade 1, Grade 2, Grade 5 (Ti-6Al-4V), Grade 23 (Ti-6Al-4V ELI)
Brass & copper: C36000, C11000, C26000
If your specification calls for a material not listed above, please ask — we work with approved steel mills and can source commercial grades, pressure-vessel grades, and AMS/aerospace grades.
Q: Do you offer welding and fabrication for complex assemblies, including code-compliant work?
A: Yes. Welding and fabrication is a core Shengtao capability, covering single-part weldments through to fully welded structural frames, pressure vessel shells, and pipe spools.
Welding processes: SMAW, GMAW/MIG, GTAW/TIG, SAW (submerged arc), FCAW, orbital TIG
Welder qualifications: AWS D1.1 / D1.6, ASME Section IX, EN ISO 9606
NDE capabilities: 100% VT, PT, MT, UT, RT (X-ray) available, including third-party witness
We fabricate to:
• ASME Section VIII Div.1 — pressure vessels
• ASME B31.1 / B31.3 / B31.4 — power, process, and liquid piping
• AWS D1.1 — structural steel
• PED 2014/68/EU — European pressure equipment
• NACE MR0175 / ISO 15156 — sour service
Every fabrication ships with a full data book: weld map, WPS/PQR, welder qualifications, NDE reports, MTRs, dimensional inspection, and hydrostatic test certificate.
Q: Do you offer engineering support or design feedback on my part drawings?
A: Yes, and we encourage it. Our in-house engineering team reviews every drawing before production and provides DFM (Design for Manufacturability) feedback at no cost:
We check for:
• Machinability: features that are difficult or impossible to produce (e.g., sharp internal corners, unreachable undercuts, extreme aspect ratios)
• Tolerance optimization: identifying dimensions where looser tolerances can reduce cost without affecting function
• Material alternatives: suggesting equivalent grades if the specified material has long lead times or is cost-prohibitive
• Cost reduction opportunities: changes that simplify fixturing, reduce setups, or allow more efficient tooling
This is a value-added service at no extra charge — many customers have reduced per-part cost by 15–30% through DFM suggestions while maintaining full functionality.
We never modify your drawing without your written approval. All DFM suggestions are clearly annotated on a marked-up drawing for your review.
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Note: If you do not find a Sealed CNC Machined Stainless Steel Pump Housing that meets your requirements or is suitable for your customer’s project, please contact our manager sales consultant (Email: stsalesman4@stmetal001.com) and send us your specifications and technical parameter files to obtain Customized quotation plan. |
Fully machined stainless steel pump housings with precision-machined volute profiles, impeller chambers, seal cavities, and mounting flanges produced in a single CNC setup for guaranteed concentricity. Suitable for centrifugal, gear, diaphragm, and sanitary pumps. Available in 304, 316/316L, 2205 duplex, and CF8M cast stainless with optional electropolishing, passivation, and hydrostatic testing. Max envelope 800 × 600 × 500 mm.
Details
Custom CNC machined tool steel mold inserts with precision cavities, cores, cooling channels, ejector pin holes, and parting surfaces for injection molds, die casting dies, and compression molds. Produced from D2, H13, P20, M2, and S136 in annealed condition with vacuum heat treatment to final hardness, followed by precision grinding and polishing. Max insert size 500 × 400 × 300 mm, 3D contoured surfaces with CMM verification against CAD model.
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High-Volume Metal Stamped Carbon Steel Bracket is configured as a custom high-volume bracket profile with repeatable formed geometry. Manufactured in Carbon steel grade per drawing from Coil or sheet strip, it uses progressive-die or transfer stamping to control mounting holes, bends, locating tabs and load-path faces. The specified burr direction and protective finish per drawing is applied for automotive subassemblies, appliances and equipment frames, with dimensions and acceptance criteria set by the approved drawing.
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Designed from the customer technical file, this Progressive-Die Stamped Stainless Steel Terminal serves as a thin-gauge electrical terminal with controlled contact geometry. Manufactured in Stainless steel strip grade per drawing from Precision slit coil, it uses progressive-die stamping to control contact tongue, crimp zone, retention lance and terminal pitch. The specified clean contact surfaces; plating only when specified is applied for connectors, harnesses and electrical devices, with dimensions and acceptance criteria set by the approved drawing.
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The custom Fine-Blanked Steel Precision Gear Blank is built around a specific functional role: near-net gear blank with high-quality sheared edges. Manufactured in Fine-blanking steel grade per drawing from Fine-blanking strip or plate, it uses fine blanking to control tooth precursor profile, center bore, datum faces and balance-related geometry. The specified fine-blanked edge condition; heat treatment if specified is applied for gear production, transmissions and compact mechanical drives, with dimensions and acceptance criteria set by the approved drawing.
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For OEM projects requiring a drawn cylindrical canister shell with continuous wall, this Deep-Drawn Stainless Steel Canister Shell is produced to the approved drawing. Manufactured in Stainless steel sheet grade per drawing from Annealed sheet blank, it uses deep drawing to control open end, base radius, wall profile and cover/seal interface. The specified trimmed edges and cosmetic finish per drawing is applied for process containers, filter housings and appliance assemblies, with dimensions and acceptance criteria set by the approved drawing.
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Compound-Die Stamped Cold-Rolled Steel Washer is not a catalogue item; it is a drawing-led flat washer with repeatable inner and outer diameters. Manufactured in Cold-rolled steel strip grade per drawing from Cold-rolled coil, it uses compound-die stamping to control ID, OD, flatness and bearing surfaces. The specified deburred edge and surface treatment per drawing is applied for fastener assemblies, machinery and automotive hardware, with dimensions and acceptance criteria set by the approved drawing.
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Laser-Cut & Bent Sheet Metal Steel Enclosure is configured as a custom fabricated enclosure with panel and return-flange geometry. Manufactured in Carbon steel sheet grade per drawing from Sheet blank, it uses laser cutting and cnc bending to control cutouts, bend lines, door/opening interfaces and mounting points. The specified powder-coated or painted finish per drawing is applied for electrical cabinets, control boxes and equipment housings, with dimensions and acceptance criteria set by the approved drawing.
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