Custom Turned SAE 660 Bronze Pump Bearing Bushing 30mm Bore 40mm Length Oil Groove

This pump bearing bushing is machined from Cast Bronze SAE 660 (SAE 660 (CuSn7Zn4Pb7)) to ±0.02mm in the critical dimensions, then finished by Bored H7 helical oil groove. It is produced on CNC turning centres that are dedicated to small and medium volume precision work, so every dimension on the drawing is generated by the machine rather than by hand fitting. Typical users are engineers who have already been let down by a supplier that quoted a tolerance it could not hold, and who need the part to fit the first time without sorting or rework on the assembly line.

• Embeddability: SAE 660 bronze accepts grit particles into the matrix so the shaft does not score when contamination enters
• Conformal Running In: Bronze conforms to slight shaft misalignment, which reduces edge loading on the bushing ends
• Helical Oil Groove: The groove carries lubricant across the full bearing length instead of pooling at one end
• Bored To H7 After Pressing Advice: We supply the bore sized for the interference fit your housing requires and state the installed clearance
• Machined Oil Holes: Oil feed holes are drilled and deburred in the same setup as the groove so alignment is guaranteed

The process route is fixed before metal is cut. Bar stock is verified against the purchase specification and the heat number is logged, then a first article is turned and measured in full. Only after the first article is signed off does the lot run. Critical features on this pump bearing bushing are controlled to ±0.02mm with a process capability target of Cpk 1.33 or better, and the operator checks the feature at a defined frequency with the gauge stated on the control plan. Where the drawing calls for Bored H7 helical oil groove, the finishing step is carried out in house and the result is measured, not assumed. Sample parts go to the CMM for full dimensional verification, and the recorded results ship with the lot as a first article inspection report in PPAP level 3 format when a customer program requires it.

Questions are handled by engineers rather than by sales staff. Our team reviews each drawing for manufacturability, flags features that would drive cost without adding function, and proposes the tolerance band that actually matters for the assembly. That review is free and is returned within 24 hours together with a quotation. When a part fails in the field, we ask for the sample back, section it if needed and report what the failure mechanism was, because a supplier that cannot explain a failure cannot prevent the next one.

• Machines: 50+ CNC units including Swiss type lathes, 3, 4 and 5 axis machining centres and turn-mill centres from Citizen, Star, Doosan and Mazak.
• Quality lab: CMM, 2D vision measurement, roughness tester, hardness tester, salt spray chamber and spectral analyser for material verification.
• Team: 15+ mechanical engineers covering DFM review, process design, fixture design and failure analysis.
• Capacity: 500,000+ precision turned parts per month with stable output and on time delivery tracking.
• Quality system: ISO 9001:2015 certified, SGS audited, material traceability from mill heat to finished part.
• Export experience: parts shipped to 30+ countries across North America, Europe, Japan, Korea and Southeast Asia.

Centrifugal pumps, turbine bearings, marine stern tube bearings, crusher eccentric bushings and general industrial shafting.

Parts are degreased, dried and packed so that the surface finish specified above arrives intact. Standard packing is VCI paper or individual PE bag, a partitioned foam tray for form features, and an export grade corrugated carton on a pallet, with the lot number and heat number marked on the outside. Parts are warranted against material and workmanship defects for 12 months from delivery. If a part is found outside the drawing, we replace it at our cost and we pay the return freight for the defective lot. Third party inspection by SGS, BV or TUV can be arranged before shipment at your request, and we work under NDA where drawings are confidential.

Q: How much does the bore close up after pressing into the housing? A: It depends on interference and wall thickness. For a 36mm OD in a steel housing we typically see 0.02 to 0.03mm closure. We can pre-size the bore so the installed clearance is correct, just give us the housing tolerance.

Q: Bronze or polymer bushing for a slurry pump? A: Bronze handles higher load and temperature and tolerates grit embedment. Polymer wins in chemical attack or where dry running occurs. Tell us the media and duty cycle.

Q: Can you cast a custom groove pattern? A: Grooves and oil holes are machined, not cast, so any pattern is possible. Send a sketch and we will confirm feasibility.

Q: Do you supply bronze with a material certificate? A: Yes, chemical composition and hardness of the cast billet are reported with each lot.

Q: How do you confirm the Cast Bronze SAE 660 material before it is machined? A: Every bar is checked against its mill certificate with an optical emission spectrometer before it goes to a machine. If the chemistry does not match the grade, the bar is rejected and returned. The certificate for your lot is filed under the heat number and can be sent with the shipment or on request.

Q: What happens if a delivered part measures outside the ±0.02mm tolerance? A: Send the measurement and the lot number. We check the recorded values for that lot, replace the parts at our cost and cover the return freight. Because each critical feature is recorded during production, we can trace the deviation to a tool wear step, a fixture shift or a gauge issue and correct the process before the next lot runs.

Send a 2D drawing, a STEP file or a sample and you will have a manufacturability review and a firm quotation within 24 hours. Trial orders from a single piece are accepted, so the tolerance claim can be checked on your own assembly before a production order is placed.