20X35X7TC Nitrile TC Metric Oil Seal Double-Lip Shaft Seals

The 20X35X7TC Nitrile (NBR) Oil Seal is a premium metric radial shaft seal designed to prevent leaks, protect equipment, and extend service life. Manufactured from high-quality Buna-N (NBR) 70 durometer rubber, this TC style double-lip seal combines a garter spring for reliable shaft sealing and a dust lip for superior contamination protection. Ideal for reducing downtime, preventing oil leakage, and protecting against dirt, dust, and moisture, this seal ensures dependable performance in industrial, automotive, and agricultural equipment.

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

Material & Performance Details

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

Performance strengths:

• Excellent oil and grease resistance
• Good abrasion resistance
• Reliable sealing under moderate pressure (0–7 psi standard for TC seals)
• Strong performance in mineral oils and hydraulic fluids

Chemical compatibility:

• Excellent resistance to: Mineral oils, hydraulic oils, greases, water (within limits)
• Limited capability with: Mild acids, glycol-based fluids
• Not compatible with: Strong oxidizing agents, ketones, brake fluids, and ozone-rich environments

Sizes & Measurements

• Cross Section (CS): 7 mm (0.276 in)
• Inside Diameter (ID): 20 mm (0.787 in)
• Outside Diameter (OD): 35 mm (1.378 in)
• Part Number: 20X35X7TC

Cross References

This TC-style metric oil seal is fully interchangeable with major brands and DIN standards:

• DIN 3760 TC equivalent
• SKF: CRW1 / HMSA7
• Timken: TC design
• Parker: TC profile
• Garlock: 94 series
• NOK: TC type
• Dichtomatik: WBC, WCS series

Applications & Use Cases

The 20X35X7TC NBR Oil Seal is widely used in:

• Gearboxes and transmissions
• Hydraulic pumps and motors
• Axle and steering systems
• Lawn, turf, and agricultural equipment
• Industrial machinery and light construction equipment

Key Specifications

• Material: Nitrile (Buna-N, NBR)
• Durometer: 70 Shore A
• Color: Black
• Temperature range: -40° to +225°F (–40° to +107°C)
• Style: TC – Double lip with garter spring and dust lip
• Pressure rating: 0–7 psi standard

Why Buy from The O-Ring Store LLC

When you choose The O-Ring Store LLC, you gain:

• ISO9001:2015 certified quality assurance
• Large USA-based stock for fast delivery
• Same-day shipping on in-stock items
• Custom sizes and specialty compounds available
• Full lot traceability & documentation on request
• Expert technical support from trained staff
• Competitive pricing without compromising quality

FAQs

Q1: What does “TC” mean in oil seals?
A TC seal combines a garter spring for shaft sealing with an additional dust lip for contamination protection, making it one of the most common and reliable oil seal styles.

Q2: Can this Nitrile oil seal handle high pressure?
Standard TC NBR seals are designed for up to 0–7 psi. For higher pressures, reinforced designs such as TCN or PTFE-based seals should be considered.

Q3: Is NBR suitable for outdoor exposure?
While NBR offers excellent oil resistance, it is not ozone or UV resistant. For outdoor applications, FKM (Viton®) or HNBR may be more suitable.