Screen journal-bearing PV, then send your drawing and operating conditions for grade-fit and export review.
Published September 23, 2026 · Reviewed October 2, 2026
Estimate journal-bearing PVComplete RFQs are easier to review within 1-2 business days when drawings, graphite grade, quantity, and destination are included.
The browser-based calculator loads when this section enters view. Its formula, assumptions, and an RFQ route remain available below.
Request a bearing application reviewA drawing is only one part of a bearing RFQ. Operating data, grade-specific test limits, assembly fit, and the export route all need review before a selection is confirmed.
Cold and operating clearances depend on shaft, bearing, and housing materials, fits, temperatures, and geometry. Share the full stack-up for supplier review.
The tool estimates projected pressure × sliding speed for a rotating journal. Only the chosen grade’s test data can establish an allowable operating point.
Classification depends on the item and export route; density alone is not a decision. Agree protective packing for the finished part and shipping route.
Matching the graphite impregnation to the operating environment is critical to avoid premature wear or chemical degradation.
| Material Family | Best Fit Application | Key Risk / Constraint | Validation Step |
|---|---|---|---|
| Resin-impregnated carbon / graphite | Potential option for liquid service after grade and medium review | Temperature and chemical compatibility depend on the specific resin and construction. | Confirm full chemistry, temperature range, pressure, and finished-part data. |
| Metal-impregnated carbon / graphite | Potential option where a supplier-rated grade fits the load and speed | Filler chemistry can limit media compatibility and may affect export classification. | Request the exact grade datasheet, PV test conditions, and filler composition. |
| Plain or electrographite | Potential option for dry-running service when the exact grade is qualified | Strength, oxidation resistance, and wear performance vary by grade and atmosphere. | Confirm atmosphere, counterface, duty cycle, and the grade-specific operating envelope. |
| Alternative bearing materials | Potential option when graphite limits, cost, or supply do not fit | Lubrication, temperature, chemistry, and maintenance requirements may differ. | Compare qualified product data against the same load, speed, medium, and life target. |
For product specifications and machining scope, see carbon graphite bearings and resin-impregnated graphite. This page focuses on exporter due diligence and RFQ preparation.
The linked control references cover U.S. and China examples only. They are not a complete classification for every manufacturing origin, transit route, or destination. Verify current rules for the transaction before shipment.
The estimate uses the entered journal dimensions, steady radial load, and rotational speed. It does not compare the result with an assumed universal graphite limit.
Projected pressure = load (N) ÷ [diameter (mm) × loaded length (mm)]. Surface speed = π × diameter (m) × rpm ÷ 60. The tool multiplies those values and reports PV in MPa·m/s.
This is a screening estimate for a steady, rotating cylindrical journal only. Edge loading, misalignment, shocks, start-stop cycles, lubrication, thermal balance, and bearing deformation require a separate design review.
Treat these as sourcing paths to investigate, not a grade recommendation. Compare supplier data using the same load, speed, medium, temperature, and service-life target.
| Route | Investigate when | Confirm before selection |
|---|---|---|
| Standard PTFE/Bronze bearings | Applications where the specific product rating and lubrication system fit | Temperature, media compatibility, and dry-running limits are product-specific. |
| Plain carbon graphite | Potential dry-running service with a supplier-qualified grade | Strength, porosity, pressure capability, and atmosphere limits vary by grade. |
| Impregnated carbon graphite | Potential liquid or loaded service when the impregnant is compatible | Filler chemistry changes temperature, media, wear, and export review requirements. |
Prepare these inputs before requesting a quote to ensure an accurate engineering review.
Review our drawing-to-shipment workflow and inspection, packing, and export-document controls before sending a bearing RFQ.
The shaft, bearing grade, housing fit, temperature distribution, and assembly method all affect the running gap. Do not use a universal clearance rule; provide the full assembly drawing and hot/cold temperature range so the supplier can review the stack-up.
PV is projected bearing pressure multiplied by sliding speed. It is one screening measure related to frictional heating, but an allowable value belongs to a specific grade and test condition. Compare this page’s estimate with the supplier’s published rating at the relevant temperature, medium, counterface, and duty cycle.
No. Classification depends on the item and applicable jurisdiction, origin, route, destination, end user, and end use. U.S. ECCN 1C107 lists specified graphite and ceramic items with technical and use criteria. China’s official graphite FAQ says the listed artificial graphite purity, flexural-strength, and density criteria apply together. Check the current official rules and obtain a competent classification before shipping.
Some grades are designed for dry-running service, but performance depends on the exact grade, shaft condition, load, speed, temperature, atmosphere, and duty cycle. Ask for the grade-specific test data and counterface requirements; this page’s screening result is not a dry-running approval.
No. The estimate assumes a rotating cylindrical journal, uniform steady radial load across its projected area, and continuous rotation. Thrust, oscillating, intermittent, misaligned, and non-cylindrical applications need a different engineering method and should be reviewed from the drawing and motion profile.
This page does not assign a tariff code. Classification depends on product construction, function, jurisdiction, and national tariff schedule. Have the importer or customs broker confirm the code for the exact finished item and destination.
Provide part dimensions, mass, fragile features, quantity per shipment, route, and any storage or handling constraints. Agree on individual separation, immobilization, moisture protection where needed, and packaging validation with the shipper; a generic foam recommendation does not guarantee safe arrival.
Send the drawing, shaft details, speed, load, temperatures, operating medium, and destination, end user, and end use. We can review the screening PV estimate, ask the grade supplier to verify limits and clearances, and agree protective export packing after the route and part details are confirmed.
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