TC Oil Seal 14mm Bore — Nitrile Double Lip Rotary Shaft Seal | 14 x 20~35mm

Measure three dimensions: the shaft diameter (= inner diameter / bore), the housing bore (= outer diameter), and the housing depth (= seal height). For this listing the bore is fixed at 14mm (≈9/16"): select the OD and height that match your housing. When in doubt, measure the old seal with calipers — a seal that is even 0.5mm off will not seat correctly. OD and height are shown in the format ID × OD × Height in the variant selector.

TC-type oil seals are generally designed for low-to-moderate shaft speeds and differential pressures up to approximately 0.3 bar (≈4 psi). They are typically used in splash-lubricated or grease-packed housings rather than pressurized circuits. For higher-pressure applications, a dedicated pressure seal or labyrinth seal is usually required. Confirm your application requirements before ordering.

Yes. Nitrile (NBR) rubber is resistant to water, petroleum oils, greases, and mild chemicals, making it well suited for outdoor and wet environments. However, NBR is generally not recommended for prolonged exposure to ozone, strong acids, or ketone-based fluids. For those conditions, a Viton (FKM) seal is typically the better choice.

These are metric TC oil seals with a 14mm bore. They are compatible with any smooth, round shaft of 14mm diameter — the seal rides on the shaft surface, not on threads. Shaft thread standard (metric, UNC, UNF, etc.) is irrelevant as long as the shaft diameter at the sealing surface is 14mm. Recommended shaft surface finish is typically Ra 0.2–0.8 µm for best sealing life.

A double-lip (TC) seal adds a secondary dust lip that faces outward, blocking contaminants from reaching the primary oil-retention lip. Choose a TC seal when the shaft is exposed to dirt, dust, water splash, or debris — which covers most automotive, agricultural, small engine, and outdoor power equipment applications. Single-lip seals are generally used in clean, enclosed environments where contamination ingress is not a concern.

Nitrile rubber typically performs reliably from about -40°F to +250°F (-40°C to +120°C). Short-term excursions up to +275°F (135°C) are generally tolerated, but sustained high heat will accelerate lip wear and reduce seal life. For continuous high-temperature service above 250°F, a Viton (FKM) seal is usually the better choice.

This listing offers pack sizes of 2, 5, 10, 15, 20, and 50 pieces. Order 2–5 for a single repair job plus a spare; order 10–50 for fleet maintenance, workshop stock, or production use. Larger packs offer a lower per-piece cost. All pieces in a pack are the same size — select your size and quantity from the variant dropdowns above.