NSN 2840-01-399-3971 · NIIN 013993971 · Part number 1A7545
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney · FSC 2840 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components · FSG 28 — Engines, Turbines, and Components · CAGE 77445
Government record, cited
NSN 2840-01-399-3971 — this item is cataloged by the U.S. Government under National Stock Number 2840-01-399-3971. Manufacturer of record part number: 1A7545.
Also searched as2840-01-399-3971 ·
2840013993971 ·
NIIN 013993971 ·
01-399-3971 ·
FSC 2840 Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components · CAGE 77445 · 1A7545
Nearby stock numbers← 2840-01-399-3970 Duct, Fan Case, Aircraft Gas Turbi
·
2840-01-399-3972 Baffle, Radial Drive Assembly, Air →
Features
Lock,bearing Duct,a — FSC 2840
General Characteristics Item Description: AMS-5663 LENGTH:0.852/0.878, WIDTH:0.1885/0.1895
1 manufacturer part number on file
Manufacturer of record: Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
Identification
NSN: 2840-01-399-3971
NIIN: 013993971
FSC: 2840 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components
FSG: 28 — Engines, Turbines, and Components
Primary part number: 1A7545
Manufacturer: Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
General Description
The Lock,bearing Duct,a, cataloged under National Stock Number 2840-01-399-3971, is classified within Federal Supply Class 2840 (Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
2840-01-399-3971
Primary Part Number
1A7545
Item Name
Lock,bearing Duct,a
FSC / FSG
2840 / 28 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components
Manufacturer
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
No interchangeability data on file.
Other items in FSC 2840 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2840-00-000-0048
ENGINE,AIRCRAFT,TURBO-SHAFT
2840-00-000-0049
MODIFICATION KIT,ENGINE
2840-00-001-1741
CASE AND NOZZLE ASSEMBLY,TURBINE
2840-00-001-1743
2840-00-001-1743 · Item name not on file
2840-00-001-2117
2840-00-001-2117 · Item name not on file
2840-00-001-2284
2840-00-001-2284 · Item name not on file
2840-00-001-3922
2840-00-001-3922 · Item name not on file
2840-00-001-4903
SEAL,AIR,AIRCRAFT GAS TURBINE EN
Frequently Asked Questions
What is NSN 2840-01-399-3971?
NSN 2840-01-399-3971 is a Lock,bearing Duct,a, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 2840, Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components. Status: active.
What part numbers are listed for NSN 2840-01-399-3971?
NSN 2840-01-399-3971 has 1 manufacturer part number on file: 1A7545 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
What are the specifications of 1A7545?
Key specifications for 1A7545: General Characteristics Item Description: AMS-5663 LENGTH:0.852/0.878, WIDTH:0.1885/0.1895; Special Features: USED ON NUMBER 4 BEARING.. 1 specification is documented in the U.S. Government catalog.
Is NSN 2840-01-399-3971 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
What is the DEMIL code for NSN 2840-01-399-3971?
NSN 2840-01-399-3971 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.