PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

8212789Eyepiece Assembly,optical Instru

Naval Sea Systems Command · NSN 1240-01-670-4893 · FSC 1240 · No Item Name Available
Verified by PartsTable
NSN 1240-01-670-4893 — this item is cataloged by the U.S. Government under National Stock Number 1240-01-670-4893. Primary manufacturer part number: 8212789.
Features
  • Eyepiece Assembly,optical Instru — FSC 1240
  • 2 verified cross-references
  • Primary manufacturer: Naval Sea Systems Command
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Eyepiece Assembly,optical Instru, cataloged under National Stock Number 1240-01-670-4893, is classified within Federal Supply Class 1240 (No Item Name Available) of the Fire Control Equipment group. The primary manufacturer of record is Naval Sea Systems Command. This item has 2 commercial cross-references from 2 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
NSN1240-01-670-4893
Primary Part Number8212789
Item NameEyepiece Assembly,optical Instru
FSC / FSG1240 / 12 — No Item Name Available
ManufacturerNaval Sea Systems Command
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5990-00-538-4032 INTERCHANGEABLE
Synchro,control Transformer
5990-00-813-18208212789 INTERCHANGEABLE
Synchro,control Transformer
Sae International Dba Sae International
Cross-Reference Index
Part NumberManufacturer
8212789 Naval Undersea Warfare Ctr (USA)
8212789 PRIMARY Naval Sea Systems Command (USA)
Related Parts
5990-00-538-4032INTERCHANGEABLE
SYNCHRO,CONTROL TRANSFORMER
5990-00-813-1820INTERCHANGEABLE
SYNCHRO,CONTROL TRANSFORMER
8212789

Frequently Asked Questions

What is NSN 1240-01-670-4893?

NSN 1240-01-670-4893 is a Eyepiece Assembly,optical Instru, manufactured by Naval Sea Systems Command, classified under FSC 1240 (No Item Name Available). Status: active.

What are the part numbers for NSN 1240-01-670-4893?

NSN 1240-01-670-4893 has 2 cross-referenced part numbers: 8212789 (Naval Undersea Warfare Ctr), 8212789 (Naval Sea Systems Command).

What NSN replaces 1240-01-670-4893?

There are 2 known substitutes for 1240-01-670-4893: 5990-00-538-4032, 5990-00-813-1820. Verify interchangeability with system specifications before substitution.

What are the specifications of 8212789?

Key specifications for 8212789: Part Name Assigned by Controlling Agency: EYEPIECE BOX ASSY. 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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