YNF16811, the O-ring seal equivalent to CAT part number 8T-6404, is built for excavator hydraulic systems where tight static sealing is required. It provides excellent resistance to oil, temperature, and deformation under pressure. Its round cross-section ensures a precise fit for ports, flanges, and valve cavities in CAT and similar equipment. The seal is available in NBR (standard) and FKM (high-temp) materials. Designed to reduce hydraulic leaks and maintenance downtime, it is a key item for any repair operation or stockroom.

O-Ring Seal Technical Sheet

Item	Details
YNF Code	YNF16811
OEM Part Number	8T-6404
Product Name	Seal-O-Ring
Material	NBR (Standard), FKM (Optional)
Shape	Round section
Application	Hydraulic pump/valve/cylinder seal
Compatible Brands	Caterpillar, Komatsu, Volvo
Working Temp. Range	-30°C to +200°C
Max Pressure Resistance	Up to 40 MPa
MOQ	100 pcs
Packaging	Individual bag + carton
Origin	China
Delivery Methods	Express / Air / Sea freight
Payment Methods	T/T, Western Union, L/C

O-Ring Seal Applications

Application Area	Description
Hydraulic Cylinders	Sealing between cylinder parts and covers
Hydraulic Valves	Sealing ports and cavities to avoid leakage
Gear Pumps & Motors	Ensuring tight seals at rotating interfaces
Excavator Repair Kits	Essential component in cylinder rebuild kits
Fluid Systems Fittings	Static sealing in pipe and hose connections

Hydraulic O-Ring 8T-6404 Detail Display

FAQs

Related Knowledge:

O-rings like 8T-6404 are often used in static applications for sealing two fixed parts.
Material selection determines performance—NBR for oil resistance, FKM for heat and chemical exposure.
Always confirm dimensions and cross-section before replacement to avoid leakage.

Related Products:

O-ring 2H-6184 hydraulic seal
Cylinder seal kits for CAT 320
Hydraulic valve spool seals
Excavator hose and flange sealing rings

FAQs:

Q: Can I order different materials (NBR and FKM) in the same batch?
A: Yes, we support mixed material orders as per your project needs.
Q: Does YNF offer bulk packaging for O-rings?
A: Yes, bulk-packed options are available to support distributor supply chains.

Get Quote for O-Ring 8T-6404 Now

Need high-performance O-rings for CAT excavator hydraulic systems? YNF16811 (8T-6404) is built for pressure, oil, and temperature resistance. A preferred option for OEM replacement and bulk procurement. Contact YNF Machinery today for professional support, fast shipping, and competitive B2B pricing.

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Hydraulic O-Ring Seal 8T-6404 for Excavator & CAT Systems YNF16811

O-Ring Seal Description

O-Ring Seal Technical Sheet

O-Ring Seal Applications

Hydraulic O-Ring 8T-6404 Detail Display

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