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Technical Data Sheet
55305 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 440C INNER MEMBER, case_style: SQUARE, seal_width: 0.625 INCHES NOMINAL IN, bore_diameter: 0.3745 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN, hardness_rating: 28.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER, style_designator: WITHOUT INSERT OR LINER. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-179-0972, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
55305
NSN: 5330-00-179-0972
FSC: 5330
CAGE: 76680 — FEDERAL-MOGUL CORP CHASSIS PRODUCTS DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 440C INNER MEMBER
case_styleSQUARE
seal_width0.625 INCHES NOMINAL IN
bore_diameter0.3745 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
hardness_rating28.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
style_designatorWITHOUT INSERT OR LINER
inner_member_width0.4950 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
outer_member_width0.4010 INCHES MINIMUM AND 0.4110 INCHES MAXIMUM IN
lubrication_featureGROOVE OUTER RACE MEMBER
housing_bore_diameter4.501 INCHES NOMINAL IN
sealing_element_styleANGULAR
static_radial_load_rating28000 POUNDS LBS
NSN5330-00-179-0972
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 55305 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
CASE STYLE: SQUARE
MATERIAL: STEEL CASE
SEAL WIDTH: 0.625 INCHES NOMINAL IN
ACCOMMODATED SHAFT DIAMETER: 3.500 INCHES NOMINAL IN
SEALING ELEMENT STYLE: ANGULAR
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 2000 FEET PER MINUTE FT
HOUSING BORE DIAMETER: 4.501 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CASE STYLESQUARE
MATERIALSTEEL CASE
SEAL WIDTH0.625 INCHES NOMINAL IN
ACCOMMODATED SHAFT DIAMETER3.500 INCHES NOMINAL IN
MATERIALLEATHER SEALING ELEMENT
SEALING ELEMENT STYLEANGULAR
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
HOUSING BORE DIAMETER4.501 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
4503-16Interchangeable
interchangeable cross-reference
interchangeable
L8Interchangeable
interchangeable cross-reference
interchangeable
L-8-2558Interchangeable
interchangeable cross-reference
interchangeable
6522A18Interchangeable
interchangeable cross-reference
interchangeable
5947Interchangeable
interchangeable cross-reference
interchangeable
059477Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 55305?
55305 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace 55305?
There are 20 known substitutes for 55305: 4503-16, L8, L-8-2558 and 17 more. Substitute compatibility should be verified for your specific system.
Is 55305 still available?
55305 is currently cancelled.
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