Oil Seals And Rotary Shaft Seals
CR 528308 oil seal 18X20-25X1
CR 528308 oil seal
CR 528308 HDSA2
CAD files are available on request through WhatsApp or email rather than as a public download.
Product Overview
CR528308 seals are used to seal lubricants and fluids around and fluids around an oscillating, rotating or reciprocating shafts;CR528308 seals also prevent the entry of contaminants that can destroy internal components.
Key Benefits
- Oil seals retain lubricants and fluids around an oscillating, rotating or reciprocating shaft and keep out the contaminants that destroy the internal components behind them.
- Dimensions, material, cage and precision class are confirmed in writing before the order is placed.
- Stock and produced lines are quoted separately so a shutdown can be planned around real dates.
- Non standard sizes can be made to drawing, so a fixed machine envelope is not a dead end.
Who It Is For
Engine rebuilders, mining and quarry maintenance teams, heavy truck and excavator part distributors.
Problems It Solves
A sealing failure usually stops the machine, and the replacement often has to match a legacy dimension that no longer appears in current seal catalogues.
Specifications
Recorded Specification
Every row below comes from the manufacturing record for this reference. Rows that were never filled in are omitted rather than guessed.
| Product Name | CR 528308 oil seal 18X20-25X1 |
|---|---|
| Brand | AFA |
| Material | GCr15, GCr15SiMn, chrome steel |
| Precision Class | P0 P6 P5 P4 P2 |
Application Scenarios
Where It Is Used
- Engines, gearboxes and axles
- Excavator and dozer final drives
- Mining crushers and conveyors
- Wheel hubs and truck axles
- Pumps, compressors and hydraulic cylinders
Materials
GCr15, GCr15SiMn, chrome steel. GCr15 is the standard high carbon chrome bearing steel, and GCr15SiMn adds silicon and manganese so that larger rings harden through the section. Case carburised grades are used where shock loading is high.
Material GuideDelivery And Packing
| Delivery | Stock 3 days, no stock 25 days |
|---|---|
| Packing | Wood boxes or paper boxes |
| Freight | DHL, TNT, FedEx and other express; air, sea and rail |
| Payment | L/C, T/T, Western Union |
| Quality | ISO 9001 quality assurance system |
Dimensional Data
Size And Reference Tables
Tables reproduced from the manufacturing records for this reference. Values not held on file are left blank rather than estimated.
| Retenes dimensión (INCH) | oil seal number | ||
|---|---|---|---|
| ｄ | Ｄ | T | CR 528308 |
| 18 | 20.1/4 | 1 |
Manufacturing Process
How It Is Made
Forging And Turning
Rings are formed and soft turned to the ring geometry.
Heat Treatment
Through hardening or carburising to the working hardness range.
Grinding And Honing
Raceways and faces ground to the tolerance class ordered.
Assembly And Preservation
Rolling elements and cage assembled, then preserved and packed.
Quality Control
What Is Checked
- Bore, outside diameter and width against the tolerance class ordered
- Radial and axial runout on the finished assembly
- Hardness and surface finish after grinding
- Internal clearance and rotation check before preservation
Certifications. Production runs in strict accordance with the ISO 9001 quality assurance system. Certificate copies for a specific consignment are issued with the shipping documents on request.
Customization Options
What Can Be Changed
| Precision class | P0 P6 P5 P4 P2 |
|---|---|
| Cage material | Brass, steel, bakelite or nylon by application |
| Internal clearance | Standard or a specified group |
| Marking | AFA brand, neutral, or customer marking |
| Packing | Wood boxes or paper boxes |
| Non standard sizes | Made to drawing or to a sample |
Comparison
How This Type Compares
| Type | Radial load | Axial load | Speed |
|---|---|---|---|
| Deep groove ball | Medium | Low | High |
| Angular contact ball | Medium | High one way | High |
| Cylindrical roller | High | None or located | High |
| Tapered roller | High | High one way | Medium |
| Needle roller | High for section | None | Medium |
| Thrust roller | None | Very high | Low to medium |
Use Guide
Fitting And Service Notes
- Check the shaft and housing seats for size, roundness and damage before opening the packaging.
- Push mounting force through the ring that carries the interference fit, never through the rolling elements.
- Where heat mounting is used, keep the bearing below roughly 120 degrees Celsius and never apply a flame.
- Set clearance or preload as the machine drawing specifies, then fill with the specified lubricant.
- Turn the assembly by hand and listen before the machine is started.
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Related Industries
Where It Is Specified
Metallurgy And Rolling Mills
Work roll chocks, screw-down units, coilers and runout tables run hot, dirty and continuously, and an unplanned bearing change cos…
Mining And Quarrying
Crushers, screens, apron feeders and conveyors combine shock loading with abrasive dust, so bearing and seal life is set by contam…
Chemical And Process Plant
Agitators, extruders, centrifuges and pumps run continuously and often in corrosive or high temperature service where a shutdown i…
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Technical Reading
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Reading Bearing Damage And Failure Patterns
Bearing Storage Packing And Preservation
Quote CR 528308 oil seal 18X20-25X1
Send the quantity and destination. Dimensions, material, cage and precision class are confirmed in writing before the order.
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