03072TC Type TC Nitrile Oil Seal 0.375" Shaft OD X 0.75" Bore ID X 0.25" Seal Width

When you need a dependable seal that keeps equipment running and prevents costly leaks, the 03072TC Type TC Nitrile Oil Seal delivers. Designed for a 0.375" shaft, 0.750" bore, and 0.250" width, this seal provides consistent oil retention and contamination protection in demanding environments. Built from black Nitrile (Buna-N) at 80 Duro Shore A, it offers a strong balance of flexibility and durability for real-world applications.

This TC style seal gives you two sealing actions in one. The primary sealing lip keeps lubricants in, while the secondary dust lip helps keep dirt, dust, and debris out. That means longer equipment life, less downtime, and fewer unexpected failures. In most applications, seals are the weak point, and failures often cost far more in labor and downtime than the seal itself.

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

This temperature range makes it a strong choice for standard industrial, automotive, and hydraulic systems using oil or grease lubrication.

Material & Performance Details

This seal is made from Nitrile (Buna-N), the most widely used elastomer for rotary shaft seals due to its excellent balance of cost, performance, and availability.

Material details:

• Compound: Nitrile (Buna-N, NBR)
• Durometer: 70 Shore A
• Color: Black

Performance strengths:

• Excellent resistance to petroleum-based oils and greases
• Good abrasion resistance for rotating shafts
• Reliable sealing performance in dynamic applications
• Strong compression set resistance for long-term sealing

Chemical compatibility:

• Excellent resistance to:
  • Mineral oils
  • Hydraulic fluids
  • Petroleum-based lubricants
  • Greases
• Limited capability with:
  • Mild chemicals
  • Water and low concentration fluids
• Not compatible with:
  • Strong acids
  • Ozone exposure over long periods
  • Polar solvents such as glycol-based fluids

Nitrile remains the most common material for oil seals because it performs well across a wide range of applications at a practical cost.

Sizes & Measurements

• Shaft Size (ID): 0.375" (9.53 mm)
• Bore Size (OD): 0.750" (19.05 mm)
• Width: 0.250" (6.35 mm)
• Seal Type: TC (Double Lip with Spring)
• Part Number: 03072TC

Cross References & Equivalent Profiles

This TC style seal is one of the most widely used industry-standard designs, making it easy to interchange across brands and platforms.

Common cross references:

• DIN 3760: TC Profile
• Freudenberg: BAUM / BASL
• SKF: HMSA7
• Parker: TC
• NOK: TC
• Trelleborg: TRE
• Garlock: 94 Series
• Dichtomatik: WAS
• Timken: TC equivalent profiles
• National: 470000 series equivalents

TC style seals combine a spring-loaded primary lip with a dust lip, providing both sealing and exclusion in one design.

Applications & Use Cases

This seal is built for rotating shaft applications where keeping oil in and contamination out is critical.

Common applications include:

• Gearboxes and transmissions
• Hydraulic pumps and motors
• Agricultural equipment
• Small engines and power tools
• Axles and steering systems
• Industrial machinery

In real-world use, a properly selected oil seal protects the entire system. A small seal failure can lead to major downtime and repair costs, which is why choosing the right seal matters.

Key Specifications

• Material: Nitrile (Buna-N, NBR)
• Durometer: 70 Shore A
• Color: Black
• Temperature Range: -40°F to +225°F (-40°C to +107°C)
• Design: TC Double Lip with Garter Spring
• Pressure Rating: 0 to 7 psi typical for standard TC seals
• Construction: Metal case with rubber sealing lips

Why Buy from The O-Ring Store LLC

When you order this seal, you are not just getting a part. You are getting reliability, speed, and support that keeps your operation moving.

• ISO9001:2015 certified processes ensure consistency and quality
• USA stock for fast delivery when you need it
• Same-day shipping on in-stock items
• Custom sizes and sourcing available
• Full lot traceability and documentation available on request
• Real technical support from a team that understands sealing systems
• Competitive pricing without cutting corners on quality

We focus on helping you avoid downtime, reduce rework, and get the right seal the first time.

FAQs

What does “TC” mean in an oil seal?
TC refers to a double lip seal with a garter spring. The primary lip seals oil in, while the secondary lip keeps dirt and contaminants out.

Can this seal handle pressure?
Standard TC seals are designed for low-pressure applications, typically 0 to 7 psi. For higher pressure, a different profile like TCN may be required.

Is Nitrile the right material for my application?
If your application involves petroleum oils, greases, or standard hydraulic fluids, Nitrile is usually the best balance of performance and cost. For aggressive chemicals or high heat, other materials like FKM may be a better fit.