PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

903521Backup Plate and Panel Assembly,

Mission Systems Orchard Park Inc · NSN 1660-00-874-2794 · FSC 1660 · No Item Name Available
Verified by PartsTable
NSN 1660-00-874-2794 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-874-2794. Primary manufacturer part number: 903521.
Features
  • Backup Plate and Panel Assembly, — FSC 1660
  • 3 verified cross-references
  • Primary manufacturer: Mission Systems Orchard Park Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Backup Plate and Panel Assembly,, cataloged under National Stock Number 1660-00-874-2794, is classified within Federal Supply Class 1660 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Mission Systems Orchard Park Inc. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1660-00-874-2794
Primary Part Number903521
Item NameBackup Plate and Panel Assembly,
FSC / FSG1660 / 16 — No Item Name Available
ManufacturerMission Systems Orchard Park Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3120-00-757-546090352-1 INTERCHANGEABLE
Bearing,sleeve
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
5310-01-485-8172903521 INTERCHANGEABLE
Nut,plain,hexagon
Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer
Cross-Reference Index
Part NumberManufacturer
903521 Ingersoll-Rand Company Dba Ingersoll-Rand (USA)
8148650 Air Force United States Department of the Dba Tinker Afb Oc Alc Dsp Div Department of the Air Force (USA)
903521 PRIMARY Mission Systems Orchard Park Inc (USA)
Related Parts
3120-00-757-5460INTERCHANGEABLE
BEARING,SLEEVE
90352-1
5310-01-485-8172INTERCHANGEABLE
NUT,PLAIN,HEXAGON
903521

Frequently Asked Questions

What is NSN 1660-00-874-2794?

NSN 1660-00-874-2794 is a Backup Plate and Panel Assembly,, manufactured by Mission Systems Orchard Park Inc, classified under FSC 1660 (No Item Name Available). Status: active.

What are the part numbers for NSN 1660-00-874-2794?

NSN 1660-00-874-2794 has 3 cross-referenced part numbers: 903521 (Ingersoll-Rand Company Dba Ingersoll-Rand), 8148650 (Air Force United States Department of the Dba Tinker Afb Oc Alc Dsp Div Department of the Air Force), 903521 (Mission Systems Orchard Park Inc).

What NSN replaces 1660-00-874-2794?

There are 2 known substitutes for 1660-00-874-2794: 3120-00-757-5460, 5310-01-485-8172. Verify interchangeability with system specifications before substitution.

What are the specifications of 903521?

Key specifications for 903521: End Item Identification: 1660007755481. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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