TC Oil Seal 15mm 16mm 17mm ID — Double Lip NBR Rotary Shaft Seal, All Depths

Measure the bore depth in your housing and match it to the seal's listed depth dimension. For example, a seal listed as 15 × 25 × 7 has an inner diameter of 15mm, outer diameter of 25mm, and a depth of 7mm (≈0.28"). When in doubt, choose a depth that fits flush with or slightly below the housing face to allow proper installation without bottoming out.

TC (also designated R23 or TTO) refers to a double-lip design: the primary lip retains oil or grease inside the housing, while the secondary dust lip prevents external contaminants — dirt, water, and debris — from entering the bearing or shaft area. This dual-barrier design is generally preferred over single-lip seals in environments with exposure to dirt, moisture, or road splash.

TC-type NBR oil seals are typically designed for low-to-medium pressure applications. They are generally suitable for static pressures up to approximately 0.3 bar (≈4.4 psi) and are not intended for high-pressure hydraulic circuits. For dynamic shaft sealing at higher pressures, a hydraulic rod seal or PTFE-lipped seal may be more appropriate. Contact us to confirm suitability for your specific application.

NBR nitrile rubber offers good resistance to water, petroleum oils, and mild chemicals, making it generally suitable for outdoor and wet environments. However, NBR is not recommended for prolonged exposure to ozone, strong UV radiation, or aromatic fuels. For highly aggressive outdoor or chemical environments, a Viton (FKM) seal may be more appropriate. The double-lip design adds an extra layer of protection against water ingress.

These are metric-dimensioned oil seals compatible with metric shafts and housings following ISO, DIN, and JIS standards. The inner diameter must match your shaft OD exactly (15mm, 16mm, or 17mm), and the outer diameter must match your housing bore. Always verify both dimensions — and the housing depth — before ordering. These seals are not designed for inch-standard (SAE) shafts without confirming dimensional equivalence.

Divide the millimeter value by 25.4 to convert to inches. Quick reference:

• 15mm ≈ 0.591"
• 16mm ≈ 0.630"
• 17mm ≈ 0.669"
• 7mm depth ≈ 0.276"
• 25mm OD ≈ 0.984"
• 35mm OD ≈ 1.378"
• 47mm OD ≈ 1.850"

For any specific size in this listing, divide the listed mm value by 25.4 for the inch equivalent.

If you are completing a single repair, a pack of 1 or 5 is typically sufficient. For workshop stock, fleet maintenance, or production use, a pack of 10 offers better per-unit value. Pack availability varies by size — select your dimension first, then check the Packing Quantity option to see which quantities are available for that specific seal.