TC TG Oil Seal Skeleton FKM Rubber Framework Double Lip Oil Sealing Ring 35-65mm

Measure three dimensions on your existing seal or housing: Inner Diameter (ID) — the shaft diameter the seal rides on; Outer Diameter (OD) — the bore in the housing the seal presses into; and Depth (width) — how deep the seal sits in the housing. Match all three to the variant option listed as Inner × Outer × Depth in mm. If your seal is worn, measure the housing bore for OD and the shaft for ID.

NBR (nitrile) seals are suitable for standard petroleum oils at moderate temperatures. FKM (fluoroelastomer) seals are the better choice when operating temperatures exceed roughly 120 °C, when the fluid contains synthetic additives or mild chemicals, or when the application demands longer service intervals. FKM maintains its elasticity and sealing force across a wider temperature range than NBR.

The primary (inner) lip seals against the rotating shaft to retain lubricant inside the bearing cavity. The secondary (outer) dust lip faces outward and blocks contaminants — dirt, water, and debris — from migrating inward along the shaft. This two-barrier design extends bearing life in environments where external contamination is a concern, such as agricultural equipment or outdoor machinery.

FKM rubber has good compatibility with most petroleum-based gear oils, mineral ATF, and many synthetic lubricants. However, compatibility can vary with specific fluid formulations. If your application uses a highly specialized synthetic fluid or a fluid with aggressive additive packages, verify FKM compatibility with your fluid supplier's data sheet before installation.

Clean the housing bore and shaft. Lightly lubricate the seal lip and the shaft surface with the same oil used in the application. Align the seal squarely with the housing bore. Use a seal driver or a flat socket matching the seal's outer diameter to press it in evenly — never tap directly on the seal face. Press until the seal is flush with or just below the housing face. Avoid dragging the lip over sharp shaft edges; use a chamfer or installation sleeve if needed.

A worn or scored shaft will cause premature seal failure regardless of seal material. If the shaft shows a visible wear groove at the seal contact area, the seal lip cannot maintain consistent contact pressure and will leak. Options include replacing the shaft, installing a speedi-sleeve (shaft repair sleeve) over the worn area, or repositioning the seal slightly axially if the housing allows. Always inspect the shaft surface before fitting a new seal.

Common applications include automotive gearbox output shafts, differential pinion and axle seals, agricultural tractor PTO shafts and axle ends, hydraulic pump shaft seals, industrial gearboxes, and general rotating equipment where a metric TC/TG profile seal is specified. The 35–65mm inner diameter range covers a wide variety of mid-size shaft applications.