TC Oil Seal 47 48 50mm ID — FKM Rubber Dual Lip Rotary Shaft Seal Ring

Measure three dimensions on your application: (1) the shaft outer diameter — this is the seal's ID; (2) the housing bore inner diameter — this is the seal's OD; (3) the housing groove depth — this is the seal's thickness. Match all three to the variant listed as ID × OD × Thickness in mm. For example, 50*70*8mm fits a 50mm shaft (≈1.97"), a 70mm bore (≈2.76"), in an 8mm deep groove (≈0.31"). If you are working in inches, multiply by 25.4 to convert to mm.

FKM (fluoroelastomer, commercially known as Viton) generally offers significantly better resistance to high temperatures, petroleum-based and synthetic oils, fuels, and aggressive chemicals compared to standard NBR (nitrile) rubber. FKM seals typically remain flexible and effective up to around 200°C (392°F), whereas NBR seals may harden and crack at temperatures above 100–120°C. For gearboxes, hydraulic systems, or any application with elevated operating temperatures, FKM is generally the preferred choice.

Yes, in most cases. FKM rubber generally provides good resistance to moisture, UV exposure, and weathering. The dual-lip design adds a secondary dust exclusion lip that helps block water, mud, and particulate contamination from reaching the primary sealing lip and the bearing housing. These characteristics make TC FKM seals a common choice for agricultural machinery, outdoor power equipment, and construction equipment shaft sealing.

TC-type rotary shaft oil seals are typically designed for low-to-moderate shaft surface speeds — generally up to approximately 4–8 m/s depending on the specific size and lubrication conditions — and low positive pressure differentials (typically under 0.05 MPa / 7 psi). For high-speed spindles or pressurized housings, please contact us to confirm suitability before ordering.

Yes. These TC skeleton oil seals follow standard metric dimensions and are generally interchangeable with seals conforming to ISO 6194 and DIN 3760 standards. This means they can typically be used as direct replacements in most European and Asian metric machinery without housing modification. Always verify the exact ID, OD, and thickness against your application before installation.

All pack options contain identical seals — the choice depends on your needs. 1 PCS is ideal for a single repair. 2 PCS is recommended when sealing both ends of a shaft (e.g., both sides of a gearbox output shaft) or when keeping one spare on hand. 5 PCS offers the best per-unit value and is suited for fleet maintenance, workshop stock, or recurring replacement schedules. The 2 PCS and 5 PCS packs are priced at a discount relative to buying multiple 1 PCS units.

Follow these steps for a clean installation: (1) Clean the housing bore and shaft journal thoroughly. (2) Lightly lubricate the seal lip with clean grease or the fluid being sealed. (3) If the shaft has a keyway, thread, or sharp edge, use a chamfer sleeve or wrap the shaft with thin tape to protect the lip during installation. (4) Press the seal squarely into the bore using a seal driver or a flat block of the correct diameter — never strike the seal face directly with a hammer. (5) Confirm the primary lip faces the fluid/lubricant side. (6) Press until the seal face is flush with or slightly below the housing face.