Backup ring 121-1459 for CAT hydraulic cylinders

YNF16819 anti-extrusion ring for O-ring support

Excavator backup ring for static seal protection

PTFE backup ring 121-1459 for CAT machinery

Hydraulic seal support ring for cylinder pistons

OEM-style backup ring for CAT valve repairs

Backup Ring 121-1459 for CAT Hydraulic Sealing Systems YNF16819

121-1459 backup ring for high-pressure sealing in CAT hydraulic systems.

OEM part 121-1459, designed for CAT hydraulic sealing systems
Provides anti-extrusion support for O-rings and U-cups
Made of durable PTFE, NBR, or nylon, resisting deformation
Ideal for use in hydraulic cylinders, pumps, and valves
Ensures longer service life of seals in high-pressure environments

Get A Free Quote

Products Categories

Excavator Coupling

Excavator Rubber Parts

Hydraulic Seal Kit

Excavator Electric Parts

Diesel Engine

Engine Parts

Hydraulic Pump Assembly

Excavator Swing Motor

Excavator Final Drive Travel Motor

Hydraulic Parts

Filters

Excavator Undercarriage Parts

Case Excavator Parts

Caterpillar Excavator Parts

Cummins Engine Parts

Doosan Excavator Parts

Daewoo Excavator Parts

Hitachi Excavator Parts

Hyundai Excavator Parts

Isuzu Engine Parts

JCB Excavator Parts

KATO Excavator Parts

Kobelco Excavator Parts

Komatsu Excavator Parts

Kubota Excavator Parts

Sumitomo Excavator Parts

Volvo Excavator Parts

Yanmar Excavator Parts

Get A Free Quote

Backup Ring Description

YNF16819, a backup ring matching CAT part number 121-1459, is a key component used in hydraulic systems to prevent O-ring extrusion under high pressure. Installed adjacent to an O-ring in static grooves, it supports sealing under demanding conditions. Manufactured from high-strength PTFE or rubber-based compounds, this ring resists compression set and maintains shape under load. It is widely used in hydraulic cylinders, control valves, and manifold blocks of CAT excavators. A vital part for field service kits and hydraulic system rebuilds.

Backup Ring Technical Sheet

Item	Details
YNF Code	YNF16819
OEM Part Number	121-1459
Product Name	Ring-Backup
Material	PTFE / NBR / Nylon
Application Area	Hydraulic anti-extrusion sealing
Compatible With	O-rings, U-seals, and lip seals
Pressure Resistance	Up to 45 MPa
Temperature Range	-30°C to +200°C
Compatible Brands	CAT, Komatsu, Volvo, Hitachi
MOQ	100 pcs
Packaging	Sealed polybag + carton box
Origin	China
Shipping Options	Express / Air / Sea
Payment Terms	T/T, Western Union, L/C

Backup Ring Applications

Application Area	Description
Hydraulic Cylinders	Supports rod/piston seals against extrusion
Pump and Valve Housings	Prevents O-ring deformation at high loads
Hydraulic Manifolds	Protects O-rings in tight seal grooves
CAT Machine Maintenance	Frequently included in professional seal kits
B2B Distribution	Essential inventory for hydraulic repair kits

CAT Backup Ring 121-1459 Detail Display

FAQs

Related Knowledge:

Backup rings are essential in systems operating over 20 MPa, where O-rings alone may extrude.
PTFE rings offer high temperature and chemical resistance, ideal for aggressive fluids.
Correct groove sizing and pairing with the right O-ring ensures optimal performance.

Related Products:

095-1787 CAT backup ring
095-1590 O-ring seal for hydraulic fittings
Cylinder seal kits for CAT 320D
Hydraulic dust seals and guide rings

FAQs:

Q: Can backup rings be used on both sides of an O-ring?
A: Yes, in bi-directional pressure systems, use one ring on each side.
Q: Do you supply these in pre-kitted seal packages?
A: Yes, backup rings can be included in customized CAT repair kits.

Request Quote for Backup Ring 121-1459

Need a reliable backup ring for sealing support in CAT hydraulics? YNF16819 (121-1459) is manufactured to OEM precision with durable anti-extrusion properties. It’s a trusted solution for hydraulic technicians, parts distributors, and fleet managers seeking long-term sealing stability. Submit your inquiry today for factory-direct pricing and technical guidance.

Get A Free Quote Now

KHJ19270 Pedal Valve for Case CX210 Excavator Hydraulic Control System

4288336 PC Valve for Hitachi EX200-2 Excavator Hydraulic Control System

Sun Gear LQ15V00007S099 for SK235-8 SK250-8 Excavator Travel Reduction Gearbox

4247567 O-Ring for Excavator Hydraulic Sealing | OEM Replacement Seal

Z2905 Excavator Bearing 22216RHW33 4293424 for Swing Travel Gear Applications

VOE14638307 Main Pump Seal Kit for Volvo EC380 Hydraulic Excavator

31Y1-29930 Boom Cylinder Seal Kit for Hyundai R290-9 Excavator

289-7716 Arm Cylinder Seal Kit for Caterpillar CAT312D Excavator Hydraulic System

Servo Piston for HPV050 Hydraulic Pump Excavator Control Component

348-5434 Idler Tension Wheel for Caterpillar E320D2 E323DL Excavators

Essential Tips for Choosing Caterpillar 312 Excavator Parts

Choose Caterpillar 312 excavator parts that ensure compatibility, durability, and cost-effectiveness. Avoid delays and counterfeit parts with trusted suppliers.

Learn More >>

A Comprehensive Guide to Buying Doosan Excavator Parts in Sydney

Find reliable suppliers for Doosan excavator parts in Sydney. Learn about OEM, aftermarket, and used options to ensure compatibility and cost-effectiveness.

Learn More >>

A Guide to Choosing Reliable Crawler Excavator Parts

Choose the best crawler excavator parts by focusing on compatibility, durability, and trusted suppliers to ensure efficiency, reduce downtime, and save costs.

Learn More >>

Essential Tips for Buying Excavator Salvage Parts Online

Learn how to buy excavator salvage parts online safely. Check seller reviews, part compatibility, and avoid hidden fees for a smooth purchasing experience.

Learn More >>

5 Easy Steps to Replace Parts of Excavator Caterpillar

Follow these 5 easy steps to replace parts of excavator Caterpillar efficiently. Ensure safety, use genuine parts, and maintain peak performance with minimal downtime.

Learn More >>

Choosing the Best Caterpillar Excavator Parts: A Comprehensive Guide

Select the best Caterpillar excavator parts for durability, efficiency, and cost savings. Ensure compatibility and quality for optimal machine performance.

Learn More >>

Backup Ring 121-1459 for CAT Hydraulic Sealing Systems YNF16819

Backup Ring Description

Backup Ring Technical Sheet

Backup Ring Applications

CAT Backup Ring 121-1459 Detail Display

Request Quote for Backup Ring 121-1459

Related Products

Related News

Get A Free Quote Now !