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4M139BC20-53 — BUSHING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

4M139BC20-53: BUSHING,SLEEVE.

The BUSHING,SLEEVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 172 OR COPPER ALLOY 173 OVERALL, corner_shape: SQUARE OUTSIDE LEFT CORNER, flange_width: 0.0600 INCHES MINIMUM AND 0.0620 INCHES MAXIMUM IN, overall_length: 0.5910 INCHES NOMINAL IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, body_inside_diameter: 1.2435 INCHES MINIMUM AND 1.2450 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-321-9154, 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
4M139BC20-53
NSN: 3120-00-321-9154
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 70265 — ALL POWER MANUFACTURING CO. (USA)
SPECIFICATIONS
materialCOPPER ALLOY 172 OR COPPER ALLOY 173 OVERALL
corner_shapeSQUARE OUTSIDE LEFT CORNER
flange_width0.0600 INCHES MINIMUM AND 0.0620 INCHES MAXIMUM IN
overall_length0.5910 INCHES NOMINAL IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter1.2435 INCHES MINIMUM AND 1.2450 INCHES MAXIMUM IN
body_outside_diameter1.4399 INCHES MINIMUM AND 1.4409 INCHES MAXIMUM IN
flange_outside_diameter1.6150 INCHES MINIMUM AND 1.6350 INCHES MAXIMUM IN
specification/standard_data76301-ST4-139 MANUFACTURERS STANDARD
material_document_and_classificationQQ-C-530/COND HT FED SPEC ALL MATERIAL RESPONSES OVERALL
NSN3120-00-321-9154
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 4M139BC20-53 · 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
•
CORNER SHAPE: SQUARE INSIDE RIGHT CORNER
•
FLANGE OUTSIDE DIAMETER: 1.6150 INCHES MINIMUM AND 1.6350 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 1.4399 INCHES MINIMUM AND 1.4409 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE INSIDE LEFT CORNER
CORNER SHAPEUNDERCUT LEFT FLANGE BODY CORNER
FLANGE OUTSIDE DIAMETER1.6150 INCHES MINIMUM AND 1.6350 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER1.4399 INCHES MINIMUM AND 1.4409 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-530/COND HT FED SPEC ALL MATERIAL RESPONSES OVERALL
OTHER ITEMS IN FSC 3120 — Bearings, Plain, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3120-00-001-1288 3120-00-001-1835 3120-00-001-1838 3120-00-001-1928 3120-00-001-1934 3120-00-001-3933 3120-00-001-3937 3120-00-001-3938
SUBSTITUTES & CROSS-REFERENCES 1
ST4M139BC20-53Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4M139BC20-53?
4M139BC20-53 is a BUSHING,SLEEVE.
What parts can replace 4M139BC20-53?
There is 1 known substitute for 4M139BC20-53: ST4M139BC20-53. Substitute compatibility should be verified for your specific system.
What is the NSN for 4M139BC20-53?
4M139BC20-53 is cataloged in the U.S. Government catalog under NSN 3120-00-321-9154. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.