Product Overview

This high-performance oil seal is designed for precision sealing in diesel engine fuel pumps and rotating shaft applications. Manufactured to strict quality standards in Shandong, China, this seal is a direct replacement for OEM sizes 20x30x7, 20*30*7, 20x31x7, and 20*31*7. Ideal for industrial and heavy-duty diesel engines, our seals are shipped globally via DHL, UPS, FEDEX, EMS, and TNT to major markets including North America, Europe, Southeast Asia, and the Middle East.

Key Features & Benefits

• Premium Material Options: Available in NBR (Nitrile Butadiene Rubber) for standard oil resistance or FPM (Viton) for superior high-temperature and chemical resistance.
• Precision Dimensions: Manufactured to exact metric specifications (20mm ID x 30/31mm OD x 7mm Thickness) ensuring a perfect fit and leak-proof seal.
• Excellent Durability: Designed for long service life in diesel engine environments, resisting wear, cracking, and hardening from oil and fuel exposure.
• Versatile Application: Suitable for replacement and repair of fuel injection pumps, gearboxes, and rotating shafts in various diesel engines.
• Reliable Performance: Each seal undergoes quality inspection to ensure consistent lip pressure and sealing integrity.

Technical Specifications

OEM Cross-Reference

This oil seal is a direct replacement for the following OEM and reference numbers. Please verify your specific size requirements before ordering.

• Standard Size: 20x30x7, 20*30*7
• Alternative Size: 20x31x7, 20*31*7

Compatibility

This oil seal is designed for general use in diesel engine fuel injection pumps and rotating shaft assemblies. It is commonly used in:

• Diesel Fuel Injection Pumps (Inline and Rotary types)
• Industrial Engine Applications
• Agricultural Machinery Diesel Engines
• Construction Equipment Diesel Engines

Note: Always confirm the shaft diameter (20mm), housing bore (30mm or 31mm), and seal thickness (7mm) match your application before purchase.

Global Supply & Distribution

We provide efficient worldwide logistics to support B2B customers across the globe. Our standard delivery time is 3-7 working days via major carriers.

• Shipping Partners: DHL, UPS, FEDEX, EMS, TNT
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Spain), Asia-Pacific (Japan, South Korea, Australia, India), Middle East (UAE, Saudi Arabia), and South America (Brazil, Argentina).
• Fast Delivery: Efficient shipping to major industrial ports and inland centers.
• Trade Compliance: Experienced in international export and customs clearance documentation.

Quality Assurance

We prioritize quality to ensure your equipment operates reliably. Our quality assurance process includes:

• Manufacturing Standards: Produced in ISO-compliant facilities in Shandong, China.
• Material Inspection: Raw rubber compounds are tested for hardness, tensile strength, and oil resistance.
• Dimensional Accuracy: Each batch is sampled and measured to ensure strict adherence to metric specifications.
• Warranty: 6-month warranty against manufacturing defects in materials and workmanship.

FAQ

Q: How do I determine if I need the 20x30x7 or the 20x31x7 size?
A: Measure the diameter of the housing bore (the hole where the seal sits). If the bore is exactly 30mm, use the 20x30x7 seal. If the bore is 31mm, use the 20x31x7 seal. The shaft diameter (20mm) and seal thickness (7mm) remain the same for both variants.

Q: What is the difference between NBR and FPM material for this oil seal?
A: NBR (Nitrile) is the standard material for general oil and fuel resistance up to approximately 100°C. FPM (Viton) is a high-performance fluoroelastomer that offers superior resistance to high temperatures (up to 200°C), aggressive chemicals, and synthetic oils. For standard diesel fuel pump applications, NBR is usually sufficient. Use FPM if your application involves high heat or aggressive lubricants.

Q: What is the proper installation procedure for this oil seal?
A: 1) Clean the shaft and housing bore thoroughly. 2) Inspect the shaft for burrs or sharp edges and smooth them if necessary. 3) Apply a light film of clean engine oil to the seal lip and outer diameter. 4) Use a seal driver or a socket of the same diameter to press the seal evenly into the housing bore until it is flush. 5) Avoid cocking the seal during installation. Never hit the seal directly with a hammer.