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ALK4-161 — BEARING,PLAIN,SELF-ALIGNING

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

ALK4-161: BEARING,PLAIN,SELF-ALIGNING.

The BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630 RACE INSERT, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, hardness_rating: 28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER, special_features: OUTER MEMBER OVERALL LENGTH INCLUDES TWO IDENTICAL BEARING,PLAIN.SELF-ALIGNING 0.756-.762 APART FROM CENTER, style_designator: WITH INSERT AND/OR LINER, inner_member_width: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-188-6902, 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
ALK4-161
NSN: 3120-01-188-6902
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 15860 — NEW HAMPSHIRE BALL BEARINGS INC DIV ASTRO DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 630 RACE INSERT
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
hardness_rating28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
special_featuresOUTER MEMBER OVERALL LENGTH INCLUDES TWO IDENTICAL BEARING,PLAIN.SELF-ALIGNING 0.756-.762 APART FROM CENTER
style_designatorWITH INSERT AND/OR LINER
inner_member_width0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
outer_member_width0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
static_radial_load_rating1000 POUNDS LBS
outer_member_outside_diameter1.5120 INCHES MINIMUM AND 1.5240 INCHES MAXIMUM IN
NSN3120-01-188-6902
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: ALK4-161 · 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
•
INNER MEMBER WIDTH: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
•
HARDNESS RATING: 28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
•
OUTER MEMBER WIDTH: 0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: WITH INSERT AND/OR LINER
•
STATIC RADIAL LOAD RATING: 1000 POUNDS LBS
•
BORE DIAMETER: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INNER MEMBER WIDTH0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
HARDNESS RATING28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
HARDNESS RATING56.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM INNER MEMBER
OUTER MEMBER WIDTH0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
STYLE DESIGNATORWITH INSERT AND/OR LINER
SPECIAL FEATURESOUTER MEMBER OVERALL LENGTH INCLUDES TWO IDENTICAL BEARING,PLAIN.SELF-ALIGNING 0.756-.762 APART FROM CENTER
STATIC RADIAL LOAD RATING1000 POUNDS LBS
BORE DIAMETER0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
MATERIALSTEEL COMP 630 RACE INSERT
OUTER MEMBER OUTSIDE DIAMETER1.5120 INCHES MINIMUM AND 1.5240 INCHES MAXIMUM IN
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 3
9334M98P05Reference document
Same NSN cross-reference
Reference document — Secondary reference
ALK4-142Reference document
Same NSN cross-reference
Reference document — Secondary reference
9334M98P02Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 ALK4-161?
ALK4-161 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace ALK4-161?
There are 3 known substitutes for ALK4-161: 9334M98P05, ALK4-142, 9334M98P02. Substitute compatibility should be verified for your specific system.
What is the NSN for ALK4-161?
ALK4-161 is cataloged in the U.S. Government catalog under NSN 3120-01-188-6902. 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.