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HomeHardware, Seals, & ConsumablesSeals, Gaskets, & O-RingsO-Rings8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
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Hardware, Seals, & ConsumablesSeals, Gaskets, & O-RingsO-Rings
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring

An industrial O-Ring seal prevents leaks in machinery, pipelines, and hydraulic systems, made from durable, chemical-resistant materials.

Brand: Cat

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8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring
8M-4389: 2.6 X 20.3mm 70A VMQ O-Ring

An industrial O-Ring seal prevents leaks in machinery, pipelines, and hydraulic systems, made from durable, chemical-resistant materials.

Brand: Cat

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Description
Description

Description:
O-Rings are used in static sealing and some dynamic applications.

Attributes:
Cat® O-Rings are made from materials that are matched to the fluids, temperatures and pressures found in Cat engines and machines. The materials resist wear and extrusion, and provide superior resistance to seal compression set. In addition, certain Cat O-Rings are coated with PTFE to minimize seal twisting and cutting during seal installation.

Dimensions of our O-Rings are consistently held to tight tolerances to ensure they fit properly into seal grooves with the necessary seal compression.

With over 2500 O-Rings in different sizes and materials, Cat O-Rings are your best solution for your Cat and other mobile equipment O-Ring needs.

Cat Sealing systems protect more expensive parts from leaks and contamination. Protect your investment with Genuine Cat Seals.

Applications:
O-Rings are used in many static and dynamic joints throughout Cat machines and engines.

Warning:This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

Description:
O-Rings are used in static sealing and some dynamic applications.

Attributes:
Cat® O-Rings are made from materials that are matched to the fluids, temperatures and pressures found in Cat engines and machines. The materials resist wear and extrusion, and provide superior resistance to seal compression set. In addition, certain Cat O-Rings are coated with PTFE to minimize seal twisting and cutting during seal installation.

Dimensions of our O-Rings are consistently held to tight tolerances to ensure they fit properly into seal grooves with the necessary seal compression.

With over 2500 O-Rings in different sizes and materials, Cat O-Rings are your best solution for your Cat and other mobile equipment O-Ring needs.

Cat Sealing systems protect more expensive parts from leaks and contamination. Protect your investment with Genuine Cat Seals.

Applications:
O-Rings are used in many static and dynamic joints throughout Cat machines and engines.

Warning:This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
Specifications
Specifications
Units of MeasureUSMetric
Cross Section Diameter (mm): 2.62
Cross Section Diameter (in): 0.103
Inside Diameter (mm): 20.29
Inside Diameter (in): 0.799
Material: VMQ - Silicone,Silicone (70),Silicone (VMQ),Silicone / MQ / VMQ / PMQ Rubber
Polymer: VMQ (Silicone rubber)
Material Hardness: 70A
Compatible With: Air; Diacetone alcohol; Ethylene glycol; Extreme high/low temperatures; High aniline point oil; Iso-butyl alcohol; Ozone & UV light; Polyglycol
Dash Size: 117
Units of MeasureUSMetric
Cross Section Diameter (mm): 2.62
Cross Section Diameter (in): 0.103
Inside Diameter (mm): 20.29
View More
Compatible Models
Compatible Models
Underground Art Truck
AD55BAD60
Truck Engine
16931140115011451160
Power Module
OEM POWER
Integrated Toolcarrier
IT18BIT12IT28IT18IT28B
Winch
59N59L58L53555958
Motor Grader
120G16140G16H16G130G14H14G14E12G160G12F16H NA14H NA
Backhoe
D3931
Wheel Skidder
518
Track-Type Tractor
D6G2 LGPD3C IID3C IIID4C IIID3BD3CD4BD5C IIID4CD4DD4ED5BD5CD6CD6DD7G2D6ED6GD7FD7GD3D5D8LD10T2D9TD9RD9LD9ND6G2 XLD4C IID10ND10RD10TD11N
Marine Engine
D343
Pipelayer
561D572G571G589
Ripper Scarifier
12G140G130G
Wheel Tractor
650B651B660B613627621623637631D631C641651641B657666B666623B621B633C657B621R633D639D627B613B637D
Hydraulic Control
163143153140
Track Loader
931C II935C983935B939933931943941951C951B941B977K977L931B931C955K955L935C II
Soil Compactor
825B815
Wheel Dozer
834824B814824
Landfill Compactor
816826B
Compact Wheel Loader
910
Wheel Loader
988F II988992G926916920G910988FG916926930966C950930R930T992B926E
Challenger
70C657565C65B65D75C85C
Gen Set Engine
314531603150
Ripper
97795195511365498
Off-Highway Truck
D10R
Industrial Engine
D3433160
Truck
773G773F773G OEM773B775G775F775D775G OEM769773777775G LRC769B769C
Wheel Scraper
666B621B657B666657
Quarry Truck
775B
Tractor
772776768C768B772B
Bulldozer
11SU8S8U9C9U9S4P5AD5C PATLGP5S6A6S11U8A9SU3S5A PAT3PD5C PAT4A
Track-Type Loader
977K
View More
Underground Art Truck
AD55BAD60
Warranty Information
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Parts diagram for 8M-4389
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Frequently bought together
8M-43898M-4389
2M-97802M-9780
9H-33609H-3360
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Frequently bought together
8M-4389
Contact Dealer
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2M-9780
Contact Dealer
Visit us

or use our Contact Form
Contact Dealer
9H-3360
Contact Dealer
Visit us

or use our Contact Form
Contact Dealer
6P-5317
Contact Dealer
Visit us

or use our Contact Form
Contact Dealer
4F-7389
Contact Dealer
Visit us

or use our Contact Form
Contact Dealer
3J-1907
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Contact Dealer
DiagramDescriptionSpecificationsCompatible Models
Parts diagram for 8M-4389
View Detailed Parts Diagrams
Add Your Equipment
Description for part number 8M-4389

Description:
O-Rings are used in static sealing and some dynamic applications.

Attributes:
Cat® O-Rings are made from materials that are matched to the fluids, temperatures and pressures found in Cat engines and machines. The materials resist wear and extrusion, and provide superior resistance to seal compression set. In addition, certain Cat O-Rings are coated with PTFE to minimize seal twisting and cutting during seal installation.

Dimensions of our O-Rings are consistently held to tight tolerances to ensure they fit properly into seal grooves with the necessary seal compression.

With over 2500 O-Rings in different sizes and materials, Cat O-Rings are your best solution for your Cat and other mobile equipment O-Ring needs.

Cat Sealing systems protect more expensive parts from leaks and contamination. Protect your investment with Genuine Cat Seals.

Applications:
O-Rings are used in many static and dynamic joints throughout Cat machines and engines.

View More
Warning:This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
Specifications for part number 8M-4389

Units of Measure

USMetric
Cross Section Diameter (mm): 2.62
Cross Section Diameter (in): 0.103
Inside Diameter (mm): 20.29
Inside Diameter (in): 0.799
Material: VMQ - Silicone,Silicone (70),Silicone (VMQ),Silicone / MQ / VMQ / PMQ Rubber
Polymer: VMQ (Silicone rubber)
Material Hardness: 70A
Compatible With: Air; Diacetone alcohol; Ethylene glycol; Extreme high/low temperatures; High aniline point oil; Iso-butyl alcohol; Ozone & UV light; Polyglycol
Dash Size: 117
View More
Compatible Models for part number 8M-4389

UNDERGROUND ART TRUCK

AD55B AD60

TRUCK ENGINE

1693 1140 1150 1145 1160

POWER MODULE

OEM POWER

INTEGRATED TOOLCARRIER

IT18B IT12 IT28 IT18 IT28B

WINCH

59N 59L 58L 53 55 59 58

MOTOR GRADER

120G 16 140G 16H 16G 130G 14H 14G 14E 12G 160G 12F 16H NA 14H NA

BACKHOE

D3 931

WHEEL SKIDDER

518

TRACK-TYPE TRACTOR

D6G2 LGP D3C II D3C III D4C III D3B D3C D4B D5C III D4C D4D D4E D5B D5C D6C D6D D7G2 D6E D6G D7F D7G D3 D5 D8L D10T2 D9T D9R D9L D9N D6G2 XL D4C II D10N D10R D10T D11N

MARINE ENGINE

D343

PIPELAYER

561D 572G 571G 589

RIPPER SCARIFIER

12G 140G 130G

WHEEL TRACTOR

650B 651B 660B 613 627 621 623 637 631D 631C 641 651 641B 657 666B 666 623B 621B 633C 657B 621R 633D 639D 627B 613B 637D

HYDRAULIC CONTROL

163 143 153 140

TRACK LOADER

931C II 935C 983 935B 939 933 931 943 941 951C 951B 941B 977K 977L 931B 931C 955K 955L 935C II

SOIL COMPACTOR

825B 815

WHEEL DOZER

834 824B 814 824

LANDFILL COMPACTOR

816 826B

COMPACT WHEEL LOADER

910

WHEEL LOADER

988F II 988 992 G926 916 920 G910 988F G916 926 930 966C 950 930R 930T 992B 926E

CHALLENGER

70C 65 75 65C 65B 65D 75C 85C

GEN SET ENGINE

3145 3160 3150

RIPPER

977 951 955 11 3 6 5 4 9 8

OFF-HIGHWAY TRUCK

D10R

INDUSTRIAL ENGINE

D343 3160

TRUCK

773G 773F 773G OEM 773B 775G 775F 775D 775G OEM 769 773 777 775G LRC 769B 769C

WHEEL SCRAPER

666B 621B 657B 666 657

QUARRY TRUCK

775B

TRACTOR

772 776 768C 768B 772B

BULLDOZER

11SU 8S 8U 9C 9U 9S 4P 5A D5C PATLGP 5S 6A 6S 11U 8A 9SU 3S 5A PAT 3P D5C PAT 4A

TRACK-TYPE LOADER

977K

View More
Related parts
270-1533
270-1533: O-Ring Seal Kit (70A Silicone)
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KeyKey
Factory Fit

This part is designed to fit your Cat equipment based on the manufacturer’s specifications.

Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.

Remanufactured

Non-Returnable

Kit

Replaced

Remanufactured

Non-Returnable

Kit

Replaced

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