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Shaft Seals Manufacturer: Rotary Shaft Seal Types, Materials and Sourcing Guide
Quick Answer: CORASEALS supplies rotary shaft seals, oil seals, radial shaft seals, lip seals, and shaft seal kits. The correct shaft seal depends on shaft diameter, housing bore, width, material, lip type, pressure, temperature, shaft speed, and fluid. Send us the shaft diameter, housing bore, width, operating temperature, pressure, shaft speed, medium, seal profile, drawing or sample photo, and required quantity.
A shaft seals manufacturer should confirm more than a part number. Shaft seals must fit the shaft and the housing bore, resist the fluid, handle the speed and temperature, and seal in the correct direction. CORASEALS supplies standard and custom shaft seals for gearboxes, pumps, motors, axles, compressors, mixers, and general rotating equipment.
Shaft Seal Types Covered
CORASEALS supplies oil seals, rotary shaft seals, radial shaft seals, lip seals, V-rings, cassette seals, bearing seals, wheel hub seals, axle seals, gearbox seals, floating seals, and mechanical face seals. The common lip seal has a metal case, a flexible sealing lip, and a spring. The spring keeps the lip in contact with the shaft. Some profiles add a dust lip or an excluder lip for dirty or wet conditions.
Material Selection for Shaft Seals
NBR is common for mineral oil and gear oil at moderate temperature. HNBR offers better heat resistance, oil resistance, and wear resistance. FKM is selected for chemical service, fuels, and high temperature shaft seals. VMQ works in low temperature and dry heat but has limited resistance to many fuels and oils under load. EPDM is suited for water, steam, and brake fluid but is not suitable for most mineral oil and fuel environments. PTFE shaft seals handle chemical duty and high temperature but need careful lip loading. Polyurethane provides good abrasion resistance but has limits in high temperature and humid fluids.
The final material selection depends on the fluid, additive package, temperature profile, shaft speed, and mechanical load. Ask the manufacturer for compound data, Shore A hardness, and fluid compatibility before choosing a shaft seal material.
| Material | Common Use for Shaft Seals | Selection Limitation |
|---|---|---|
| NBR | Mineral oil, gear oil, and normal temperature rotary shaft seals | Not suitable for strong oxidizing media or continuous high temperature |
| HNBR | Oil, heat, and abrasive duty in gearboxes and pumps | Higher cost than NBR, chemical compatibility must be checked |
| FKM | Chemical service, fuels, and high temperature shaft seals | Low temperature flexibility and steam resistance vary by grade |
| EPDM | Water, steam, and brake fluid applications | Not suitable for most mineral oil and fuel environments |
| VMQ | Low temperature and dry heat sealing | Limited resistance to many fuels and oils under load |
| PTFE | Chemical resistant and high temperature rotary sealing | Low elasticity, shaft condition and lip loading must be controlled |
| Polyurethane | High abrasion and extrusion resistance | Limited high temperature and hydrolysis resistance in humid fluids |
Dimensions, Standards, and Surface Conditions
Shaft seals are specified by shaft diameter, housing bore, and width. Some buyers use ID × OD × width. The ID must match the shaft diameter. The OD must match the housing bore. The width must fit the housing depth. If any dimension is wrong, the seal cannot function correctly.
DIN 3760 and ISO 6194 describe rotary shaft seal dimensions and tolerances. These standards help buyers compare seals f