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Technical Data Sheet
PartsTable / COMPONENT / QB79055-4
QB79055-4 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, corner_shape: SQUARE ALL CORNERS, overall_length: 0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-891-8887, 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
QB79055-4
NSN: 3120-00-891-8887
FSC: 3120
CAGE: 19315 — HONEYWELL INTL INC DEFENSE AVIONICS SYSTEMS FORMER BENDIX NAVIGATION AND CONTROL SYSTEMS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
corner_shapeSQUARE ALL CORNERS
overall_length0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
body_outside_diameter0.6270 INCHES MINIMUM AND 0.6280 INCHES MAXIMUM IN
material_document_and_classificationMIL-L-15016, SYMBOL 2190 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
NSN3120-00-891-8887
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: QB79055-4 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: OIL LUBRICATING LUBRICATION
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-L-15016, SYMBOL 2190 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
•
BODY OUTSIDE DIAMETER: 0.6270 INCHES MINIMUM AND 0.6280 INCHES MAXIMUM IN
•
CORNER SHAPE: SQUARE ALL CORNERS
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALOIL LUBRICATING LUBRICATION
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-15016, SYMBOL 2190 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5687,TY 1,COMP A OR B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIALCOPPER ALLOY OVERALL
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
BODY OUTSIDE DIAMETER0.6270 INCHES MINIMUM AND 0.6280 INCHES MAXIMUM IN
CORNER SHAPESQUARE ALL CORNERS
OVERALL LENGTH0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
P505Interchangeable
interchangeable cross-reference
interchangeable
A271AInterchangeable
interchangeable cross-reference
interchangeable
V420CInterchangeable
interchangeable cross-reference
interchangeable
A271Interchangeable
interchangeable cross-reference
interchangeable
DD445S5504-8PC96T0-99-108Interchangeable
interchangeable cross-reference
interchangeable
DD453S55-234PC96T0-99-108Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is QB79055-4?
QB79055-4 is a BEARING,SLEEVE.
What parts can replace QB79055-4?
There are 22 known substitutes for QB79055-4: P505, A271A, V420C and 19 more. Substitute compatibility should be verified for your specific system.
Is QB79055-4 still available?
QB79055-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026