PartsTable
Technical Data Sheet
PartsTable / COMPONENT / DAS4-20B
DAS4-20B ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The BEARING,ROLLER,AIRFRAME is a the manufacturer industrial component. Key specifications include bore_diameter: 0.2500 INCHES NOMINAL IN, inner_ring_width: 1.1250 INCHES NOMINAL IN, outer_ring_width: 0.7500 INCHES NOMINAL IN, style_designator: CONCAVE ROLLERS, DOUBLE CLOSURE, SELF ALIGNING, bearing_seal_type: CONTACT, surface_treatment: CADMIUM ALL EXTERNAL/EXPOSED METAL SURFACES. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-143-3016, 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
DAS4-20B
NSN: 3110-00-143-3016
FSC: 3110
CAGE: 71867 — DE HAVILLAND AIRCRAFT OF CANADA LIMITED (CAN)
SPECIFICATIONS
bore_diameter0.2500 INCHES NOMINAL IN
seal_quantity2
shield_quantity2
inner_ring_width1.1250 INCHES NOMINAL IN
outer_ring_width0.7500 INCHES NOMINAL IN
special_features10 DEG SELF ALIGNMENT IN EITHER DIRECTION,LUBRICANT HOLE AND GROOVE IN OUTER RING,HEAT TREATED SLEEVE AND COLLARS ON INNER RING
style_designatorCONCAVE ROLLERS, DOUBLE CLOSURE, SELF ALIGNING
bearing_seal_typeCONTACT
surface_treatmentCADMIUM ALL EXTERNAL/EXPOSED METAL SURFACES
lubrication_materialGREASE
overall_outside_diameter1.2500 INCHES NOMINAL IN
lubrication_material_document_and_classificationMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
NSN3110-00-143-3016
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: DAS4-20B · 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 DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
INNER RING WIDTH: 1.1250 INCHES NOMINAL IN
•
OUTER RING WIDTH: 0.7500 INCHES NOMINAL IN
•
BEARING SEAL TYPE: CONTACT
•
STYLE DESIGNATOR: CONCAVE ROLLERS, DOUBLE CLOSURE, SELF ALIGNING
•
SURFACE TREATMENT: CADMIUM ALL EXTERNAL/EXPOSED METAL SURFACES
•
SEAL QUANTITY: 2
•
SHIELD QUANTITY: 2
TECHNICAL CHARACTERISTICS (FLIS)
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
INNER RING WIDTH1.1250 INCHES NOMINAL IN
OUTER RING WIDTH0.7500 INCHES NOMINAL IN
BEARING SEAL TYPECONTACT
STYLE DESIGNATORCONCAVE ROLLERS, DOUBLE CLOSURE, SELF ALIGNING
SURFACE TREATMENTCADMIUM ALL EXTERNAL/EXPOSED METAL SURFACES
SEAL QUANTITY2
SHIELD QUANTITY2
SPECIAL FEATURES10 DEG SELF ALIGNMENT IN EITHER DIRECTION,LUBRICANT HOLE AND GROOVE IN OUTER RING,HEAT TREATED SLEEVE AND COLLARS ON INNER RING
LUBRICATION MATERIALGREASE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
0311-0057Interchangeable
interchangeable cross-reference
interchangeable
AB-4Interchangeable
interchangeable cross-reference
interchangeable
0-AB-4Interchangeable
interchangeable cross-reference
interchangeable
0311-0346Interchangeable
interchangeable cross-reference
interchangeable
4-AB-13Interchangeable
interchangeable cross-reference
interchangeable
AB5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DAS4-20B?
DAS4-20B is a BEARING,ROLLER,AIRFRAME.
What parts can replace DAS4-20B?
There are 12 known substitutes for DAS4-20B: 0311-0057, AB-4, 0-AB-4 and 9 more. Substitute compatibility should be verified for your specific system.
Is DAS4-20B still available?
DAS4-20B 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