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1078540-1 — PLATE,RETAINING,BEARING

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

1078540-1: PLATE,RETAINING,BEARING.

The PLATE,RETAINING,BEARING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, body_diameter: 2.8745 INCHES MINIMUM AND 2.8750 INCHES MAXIMUM IN, body_thickness: 0.200 INCHES NOMINAL IN, minor_thickness: 0.740 INCHES NOMINAL IN, outside_diameter: 4.1870 INCHES NOMINAL IN, style_designator: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 3110-01-212-4792, 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
1078540-1
NSN: 3110-01-212-4792
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 3B150 — RAYTHEON COMPANY DBA RAYTHEON CO (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
body_diameter2.8745 INCHES MINIMUM AND 2.8750 INCHES MAXIMUM IN
body_thickness0.200 INCHES NOMINAL IN
minor_thickness0.740 INCHES NOMINAL IN
outside_diameter4.1870 INCHES NOMINAL IN
style_designatorROUND
aperture_diameter1.8504 INCHES MINIMUM AND 1.8511 INCHES MAXIMUM IN
counterbore_depth0.327 INCHES NOMINAL IN
overall_thickness0.940 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
mounting_hole_typeROUND, UNTHREADED
mounting_hole_diameter0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
NSN3110-01-212-4792
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 1078540-1 · 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
•
BODY DIAMETER: 2.8745 INCHES MINIMUM AND 2.8750 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MINOR THICKNESS: 0.740 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
COUNTERBORE DEPTH: 0.327 INCHES NOMINAL IN
•
OVERALL THICKNESS: 0.940 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
BODY DIAMETER2.8745 INCHES MINIMUM AND 2.8750 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MINOR THICKNESS0.740 INCHES NOMINAL IN
MOUNTING HOLE TYPEROUND, UNTHREADED
COUNTERBORE DEPTH0.327 INCHES NOMINAL IN
OVERALL THICKNESS0.940 INCHES NOMINAL IN
STYLE DESIGNATORROUND
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
OUTSIDE DIAMETER4.1870 INCHES NOMINAL 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

No substitute or cross-reference records for this part.

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 1078540-1?
1078540-1 is a PLATE,RETAINING,BEARING.
What is the NSN for 1078540-1?
1078540-1 is cataloged in the U.S. Government catalog under NSN 3110-01-212-4792. 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.