shaft seals manufacturer

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 from different sources. CORASEALS also works with customer drawings, samples, and application data when standard dimensions do not fit.

Shaft condition is part of the sealing system. Shaft surface finish, shaft hardness, runout, eccentricity, and lead angle all affect seal life. A new shaft seal can leak quickly on a grooved, pitted, or oversized shaft even when the seal dimensions are correct.

Oil Seal Type Codes and Drawings

Oil seal codes such as TC, SC, VB, TB, and TC4 appear in many catalogs. These codes are not always identical between manufacturers. A TC oil seal from one supplier may have a dust lip and a garter spring, while a similar code in another catalog may have a different case or lip arrangement. Always compare the cross section drawing, spring type, dust lip, case material, and sealing lip material before ordering.

Application Checks for Shaft Seals

Gearbox shaft seals must handle oil splash, heat, and shaft speed. Pump shaft seals may need to seal light pressure or chemical fluids. Axle and wheel hub seals often require dust lips and mud exclusion. A standard lip seal is not a high pressure seal. If the cavity pressure rises above normal lip seal limits, the lip can distort or the case can move. In those applications, a reinforced rotary shaft seal or a different seal profile may be required.

What to Send for a Shaft Seal Quote

A shaft seal quotation should be based on dimensions and service data, not only a catalog code. Send CORASEALS the following information before ordering:

Shaft diameter, housing bore, and seal width
Operating temperature and pressure
Shaft speed in rpm or meters per second
Fluid or medium
Seal profile, type code, drawing, or sample photo
Required quantity and delivery requirement

With this data, CORASEALS can check material compatibility, lip profile, case fit, and production options before quotation.

Shaft Seals Manufacturer FAQ

What dimensions are required for a shaft seal?
Provide shaft diameter, housing bore, and seal width. Use ID × OD × width if those dimensions are known. Also state the seal profile and the direction of rotation.

What is the difference between an oil seal and a rotary shaft seal?
Oil seal is a common trade term. Rotary shaft seal is a wider term for seals that control fluid on a rotating shaft. Many rotary shaft seals use a metal case and a flexible lip with a spring.

Which material should I select for gearbox oil?
NBR and HNBR are common for mineral gear oil. FKM is used when the oil temperature is high or the oil contains aggressive additives. Confirm the exact oil type and temperature before selecting the material.

Can CORASEALS quote custom shaft seals from drawings or samples?
Yes. Send a drawing with dimensions, tolerances, material, lip profile, and quantity. If no drawing exists, send a sample photo and the application data listed above.

How do I confirm an oil seal type code like TC or SC?
Type codes are not universal. Compare the cross section drawing, case style, spring type, dust lip, and material specification before ordering. Do not assume full interchangeability from a code alone.

Ready to send a shaft seal inquiry?
Send us the shaft diameter, housing bore, width, operating temperature, pressure, shaft speed, medium, seal profile, drawing or sample photo, and required quantity.