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A421-4 — RESISTOR,FIXED,COMPOSITION

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

A421-4: RESISTOR,FIXED,COMPOSITION.

The RESISTOR,FIXED,COMPOSITION is a the manufacturer industrial component. Key specifications include material: LUBRICANT LUBRICATION, corner_shape: SQUARE ALL CORNERS, overall_length: 0.2656 INCHES MINIMUM AND 0.2812 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 0.2490 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, body_outside_diameter: 0.3800 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-555-7700, 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
A421-4
NSN: 3120-00-555-7700
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 12204 — CHRYSLER REALTY COMPANY LLC DBA DAIMLER CHRYSLER (USA)
SPECIFICATIONS
materialLUBRICANT LUBRICATION
corner_shapeSQUARE ALL CORNERS
overall_length0.2656 INCHES MINIMUM AND 0.2812 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.2490 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
body_outside_diameter0.3800 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN
NSN3120-00-555-7700
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: A421-4 · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 0.3800 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 0.2490 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
•
MATERIAL: LUBRICANT LUBRICATION
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER0.3800 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH0.2656 INCHES MINIMUM AND 0.2812 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.2490 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
MATERIALLUBRICANT LUBRICATION
MATERIALCOPPER ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
A421-4M0DReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A421-4?
A421-4 is a RESISTOR,FIXED,COMPOSITION.
What parts can replace A421-4?
There is 1 known substitute for A421-4: A421-4M0D. Substitute compatibility should be verified for your specific system.
What is the NSN for A421-4?
A421-4 is cataloged in the U.S. Government catalog under NSN 3120-00-555-7700. 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.