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3TWL21-28P — BEARING,BALL,AIRFRAME

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

3TWL21-28P: BEARING,BALL,AIRFRAME.

The BEARING,BALL,AIRFRAME is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, bore_diameter: 1.3122 INCHES MINIMUM AND 1.3128 INCHES MAXIMUM IN, load_direction: RADIAL, inner_ring_width: 0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN, outer_ring_width: 0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, special_features: FRACTURED OUTER RING WITH 2 CRES HOLDING RINGS,TETRAFLUOROETHYLENE SPACER SLUGS,2 INTEGRAL SHIELDS. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-152-2937, 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
3TWL21-28P
NSN: 3110-00-152-2937
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 78118 — MPB CORPORATION DBA MPB CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
bore_diameter1.3122 INCHES MINIMUM AND 1.3128 INCHES MAXIMUM IN
load_directionRADIAL
inner_ring_width0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
outer_ring_width0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
special_featuresFRACTURED OUTER RING WITH 2 CRES HOLDING RINGS,TETRAFLUOROETHYLENE SPACER SLUGS,2 INTEGRAL SHIELDS
style_designatorSINGLE ROW, TORQUE TUBE TYPE, W/OR W/O CLOSURE
lubrication_materialGREASE
overall_outside_diameter1.7495 INCHES MINIMUM AND 1.7500 INCHES MAXIMUM IN
lubrication_material_document_and_classificationMIL-G-81322 MIL SPEC SINGLE MATERIAL RESPONSE
NSN3110-00-152-2937
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 3TWL21-28P · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
LUBRICATION MATERIAL: GREASE
•
OUTER RING WIDTH: 0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SINGLE ROW, TORQUE TUBE TYPE, W/OR W/O CLOSURE
•
OVERALL OUTSIDE DIAMETER: 1.7495 INCHES MINIMUM AND 1.7500 INCHES MAXIMUM IN
•
LOAD DIRECTION: RADIAL
•
BORE DIAMETER: 1.3122 INCHES MINIMUM AND 1.3128 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
LUBRICATION MATERIALGREASE
OUTER RING WIDTH0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
STYLE DESIGNATORSINGLE ROW, TORQUE TUBE TYPE, W/OR W/O CLOSURE
OVERALL OUTSIDE DIAMETER1.7495 INCHES MINIMUM AND 1.7500 INCHES MAXIMUM IN
LOAD DIRECTIONRADIAL
SPECIAL FEATURESFRACTURED OUTER RING WITH 2 CRES HOLDING RINGS,TETRAFLUOROETHYLENE SPACER SLUGS,2 INTEGRAL SHIELDS
BORE DIAMETER1.3122 INCHES MINIMUM AND 1.3128 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OVERALL
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-81322 MIL SPEC SINGLE MATERIAL RESPONSE
INNER RING WIDTH0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 3110 — Bearings, Antifriction, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3110-00-001-1937 3110-00-001-1938 3110-00-001-4661 3110-00-001-4662 3110-00-001-4689 3110-00-001-4722
SUBSTITUTES & CROSS-REFERENCES 2
3TWL21-28PLY76Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
42206D5Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3TWL21-28P?
3TWL21-28P is a BEARING,BALL,AIRFRAME.
What parts can replace 3TWL21-28P?
There are 2 known substitutes for 3TWL21-28P: 3TWL21-28PLY76, 42206D5. Substitute compatibility should be verified for your specific system.
What is the NSN for 3TWL21-28P?
3TWL21-28P is cataloged in the U.S. Government catalog under NSN 3110-00-152-2937. 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.