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.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .