12X20X4 TC WAS Oil Seal Radial Shaft Seal NBR



Qty Discounts Prices
2-34
$3.160		 35-1,499
$1.580		 1,500-4,999
$0.650		 5,000+
$0.500

$3.160

  • Model: 12X20X4TC
    Dimensions: 12.00mm ID X 20.00mm OD X 4.00mm HT
    Actual: 0.472" ID X 0.787" OD X 0.157" HT
  • 37 in Stock
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Keep your equipment running leak-free and dependable with this 12 x 20 x 4 mm TC style radial shaft oil seal. Designed for rotating shafts, this seal prevents oil loss while blocking dirt, dust, and contaminants from entering your system. The result is longer equipment life, reduced downtime, and fewer costly repairs.

Built from high-quality Nitrile (Buna-N) 70 durometer material in black, this oil seal delivers excellent performance in standard industrial environments. The double lip TC design with a garter spring ensures consistent sealing pressure, giving you reliable performance in motors, pumps, gearboxes, and hydraulic systems.

Operating temperature: -40° to +225°F (–40° to +107°C)

Material & Performance Details

This radial shaft seal is manufactured from Nitrile (Buna-N, NBR), one of the most widely used sealing materials due to its balance of performance and cost-effectiveness.

The 70 durometer compound provides a strong combination of flexibility and wear resistance, while the rubber-encased outer diameter improves sealing in the housing bore. The integrated spring-loaded primary lip maintains constant contact with the shaft, while the secondary dust lip adds protection against external contaminants.

Excellent resistance to:

  • Petroleum-based oils and lubricants
  • Hydraulic fluids
  • Greases
  • Water (limited exposure)

Limited capability with:

  • Ozone and weather exposure
  • Mild chemicals

Not compatible with:

  • Strong acids
  • Ketones
  • Brake fluids (glycol-based)

Sizes & Measurements

  • Dimensions: 0.472" ID X 0.787" OD X 0.157" HT
  • Actual: 0.472" ID X 0.787" OD X 0.157" HT
  • Metric: 12.00 mm ID X 20.00 mm OD X 4.00 mm HT
  • Inside Diameter (ID): 12.00 mm (0.472")
  • Outside Diameter (OD): 20.00 mm (0.787")
  • Width (HT): 4.00 mm (0.157")
  • Cross Reference: 0.472" ID × 0.787" OD × 0.157" Width
  • Part Number: 12X20X4TC
  • Profile: TC (Double Lip with Spring)
  • Material Code: NB70C401
  • Style Cross Reference: TC | WAS | Rubber Encased Oil Seal

Applications & Use Cases

This TC oil seal is commonly used across a wide range of industries where rotating shafts require reliable sealing.

Typical applications include electric motors, gearboxes, pumps, compressors, agricultural equipment, and light hydraulic systems. It is especially effective in environments where oil retention and contamination exclusion are critical to maintaining performance and extending equipment life.

Key Specifications

  • Material: Nitrile (Buna-N, NBR)
  • Durometer: 70 Shore A
  • Color: Black
  • Design: TC Double Lip with Spring (WAS Style)
  • Temperature Range: -40°F to +225°F (–40°C to +107°C)
  • Pressure Rating: Suitable for standard rotary shaft applications (low pressure)
  • Outer Surface: Rubber-encased for improved bore sealing

Equivalent Profile Names by Manufacturer / Region

  • TC – Standard global designation (most common)
  • WAS – Freudenberg / Dichtomatik equivalent
  • BA – SKF (rubber OD, single primary lip with spring, sometimes listed interchangeably depending on catalog context)
  • TC4 – Regional / Asian variation (same functional design)
  • TCS – Common aftermarket / catalog variation (double lip with spring)
  • SC (Double Lip variant) – Japanese / metric catalogs (note: SC is typically single lip, but some suppliers loosely cross to TC when dust lip is included)

Why Buy from The O-Ring Store LLC

When you order from us, you are not just buying a seal, you are getting a solution backed by experience and accountability.

We operate under ISO9001:2015 certified processes, ensuring consistency and quality you can rely on. With USA-based inventory, we offer fast shipping, including same-day shipping on in-stock items, so you get what you need when you need it.

If this exact size does not fit your application, we can source or manufacture custom seals to match your requirements. Every order can include full lot traceability and documentation upon request, giving your team confidence and compliance when it matters most.

Our team understands sealing applications and is ready to help you avoid downtime, reduce errors, and get the right part the first time.

FAQs

1. What does TC mean in an oil seal?
TC refers to a double lip design with a garter spring. The primary lip seals oil inside, while the secondary lip keeps contaminants out, giving you better protection and longer seal life.

2. Can this seal handle hydraulic pressure?
This seal is designed for rotary shaft applications, not high-pressure sealing. It works best in low-pressure environments where rotation and oil retention are the main requirements.

3. Is Nitrile the right material for my application?
Nitrile is ideal for petroleum oils and standard industrial use. If you have high temperatures or aggressive chemicals, a different material like FKM may be a better fit.