TC Oil Seal ID 36mm 37mm 38mm – NBR 70 Dual Lip Rotary Shaft Seal Ring

Measure three dimensions with calipers: the shaft diameter (= ID), the housing bore diameter (= OD), and the housing depth (= Thickness). The size is expressed as ID × OD × Thickness in mm. For example, 38×58×10mm means a 38mm shaft, 58mm bore, 10mm thick — approximately 1.50" × 2.28" × 0.39". If the old seal is available, measure it directly. Match all three dimensions exactly for a proper press fit and seal.

The lip is NBR 70 — Nitrile Butadiene Rubber at 70 Shore A hardness. NBR generally offers good resistance to petroleum-based oils, mineral hydraulic fluids, greases, and water. It is typically rated for -40°C to +120°C (-40°F to +250°F). For synthetic esters, ketones, or highly aromatic fuels, a different compound (e.g., FKM/Viton) may be more appropriate — contact us to confirm.

The dual-lip TC design includes a secondary exclusion lip that faces outward to block dust, dirt, and light moisture ingress. This makes these seals generally suitable for outdoor equipment such as garden tractors, agricultural machinery, and outdoor pumps. For fully submerged applications or exposure to aggressive chemicals, confirm compatibility before installation.

A single-lip seal has one sealing lip that retains lubricant on the inboard side. A TC (double-lip) seal adds a second lip on the outboard side that acts as a dirt and moisture excluder. For most rotary shaft applications — especially in dusty or wet environments — the TC dual-lip design is the standard recommendation because it protects both the lubricant and the primary lip from contamination.

TC skeleton oil seals are designed for low-to-moderate pressure sealing, typically under 0.3 bar (≈4.4 psi) dynamic pressure. They are not intended for high-pressure hydraulic circuits. Shaft surface speed suitability depends on the specific size, lubrication conditions, and shaft finish. A smooth shaft surface (Ra 0.2–0.8 µm) is generally recommended. Contact us to confirm for high-speed applications.

Yes — all dimensions are metric (mm). The ID matches the shaft diameter and the OD presses into the housing bore. These TC seals follow standard metric dimensions widely used in European, Asian, and many US-market pumps, gearboxes, and motors. They are direct replacements for any TC oil seal of the same ID × OD × Thickness specification.

Use a seal driver or a flat block slightly smaller than the OD to press the seal in squarely — never hammer directly on the seal face or lip. Lightly coat the primary lip with clean oil before installation. Check the shaft for burrs, nicks, or sharp chamfer edges that could cut the lip during assembly. The seal should sit flush with or just below the housing face unless otherwise specified.