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MIL-B-17931NT — BEARING,BALL,ANNULAR

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

MIL-B-17931NT: BEARING,BALL,ANNULAR.

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, special_features: TYPE 111 CLASS 8 SIZE 208, bearing_seal_type: CONTACT, lubrication_material: GREASE, departure_from_cited_document: ANNUAL BALL BEARING FOR QUIET OPERATION APPLICATION TO SUBMARINE USAGE, criticality_code_justification: ZZZW. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-891-1546, 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
MIL-B-17931NT
NSN: 3110-00-891-1546
NIINs: 008911546, 009637269, 009769738, 009873718, 009873720, 009873721, 009873723, 009873724, 009873725, 009873726, 009873727, 009873730, 009873731, 009873732, 009873733, 009873734, 009873735, 009873736, 009873737, 009873739, 009873741, 009873743, 009873744, 009873745, 009910896, 009910897, 009910901, 009910902, 009910903, 009910904, 009910906, 009910907, 009910908, 009910909, 009910910, 009910911, 009910914, 009910918, 009910948, 009910960, 009910966, 009921010, 009921012, 009921013, 009921015, 009921016, 009921018, 010548438, 010578983, 010604875, 010670623, 013718796
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seal_quantity2
special_featuresTYPE 111 CLASS 8 SIZE 208
bearing_seal_typeCONTACT
lubrication_materialGREASE
departure_from_cited_documentANNUAL BALL BEARING FOR QUIET OPERATION APPLICATION TO SUBMARINE USAGE
criticality_code_justificationZZZW
lubrication_material_document_and_classificationDOD-G-24508 FED STD SINGLE MATERIAL RESPONSE
reference_number_differentiating_characteristicsQUIET OPERATION TESTED FOR SUBMARINE USAGE
NSN3110-00-891-1546
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MIL-B-17931NT · 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
•
RETAINER FABRICATION METHOD: MACHINED
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
SURFACE FINISH: GROUND
•
BEARING PRELOAD DESIGNATION: LIGHT
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
STYLE DESIGNATOR: UNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE
•
OVERALL OUTSIDE DIAMETER: 3.9368 INCHES MINIMUM AND 3.9370 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
RETAINER FABRICATION METHODMACHINED
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
BEARING PRELOAD DESIGNATIONLIGHT
CRITICALITY CODE JUSTIFICATIONZZZW
STYLE DESIGNATORUNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE
OVERALL WIDTH1.9485 INCHES MINIMUM AND 1.9685 INCHES MAXIMUM IN
OVERALL OUTSIDE DIAMETER3.9368 INCHES MINIMUM AND 3.9370 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTANNUAL BALL BEARING FOR QUIET OPERATION APPLICATION TO SUBMARINE USAGE
NONDEFINITIVE SPEC/STD DATA134 TYPE AND 1 CLASS
SUBSTITUTES & CROSS-REFERENCES 9
AL63Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
M17931-A009Reference document
Same NSN cross-reference
Reference document — Secondary reference
Q30407DTL7077Reference document
Same NSN cross-reference
Reference document — Secondary reference
Q30407DTS7088V4Reference document
Same NSN cross-reference
Reference document — Secondary reference
M17931-A009NTSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MILB17931Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — mutilation + specific procedure
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FREQUENTLY ASKED QUESTIONS
What is MIL-B-17931NT?
MIL-B-17931NT is a BEARING,BALL,ANNULAR.
What parts can replace MIL-B-17931NT?
There are 9 known substitutes for MIL-B-17931NT: AL63, M17931-A009, Q30407DTL7077 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-B-17931NT?
MIL-B-17931NT is cataloged in the U.S. Government catalog under NSN 3110-00-891-1546. This indicates validated use in U.S. government and defense supply chains.
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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.