PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21678Gear Assy

Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems · NSN 6610-00-544-5554 · FSC 6610 · No Item Name Available
Verified by PartsTable
NSN 6610-00-544-5554 — this item is cataloged by the U.S. Government under National Stock Number 6610-00-544-5554. Primary manufacturer part number: 21678.
Features
  • Gear Assy — FSC 6610
  • 1 verified cross-reference
  • Primary manufacturer: Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems
Applications
  • Power transmission and speed reduction
  • Rotary motion transfer
  • Torque multiplication
General Description

The Gear Assy, cataloged under National Stock Number 6610-00-544-5554, is classified within Federal Supply Class 6610 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameGear Assy
FSC / FSG6610 — No Item Name Available (FSG 66)
ManufacturersUndersea Sensor Systems Inc Div Ultra Sonobuoy Systems (CAGE 50027)
Technical Specifications
ParameterValue
NSN6610-00-544-5554
Primary Part Number21678
Item NameGear Assy
FSC / FSG6610 / 66 — No Item Name Available
ManufacturerUndersea Sensor Systems Inc Div Ultra Sonobuoy Systems
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5315-00-003-410721678 INTERCHANGEABLE
Key,machine
Industrial Technologies and Services Llc
2995-00-022-513520395-1 INTERCHANGEABLE
Conduit,cable Overt
Triumph Controls, Llc Dba Triumph Controls, Llc
5935-00-201-3099216-7-8 INTERCHANGEABLE
Strap Nut,plug-in Electronic Com
Kearfott Corporation Div Guidance and Navigation Division
5970-00-310-8689M7415134SUB13PT12 INTERCHANGEABLE
Disk
Westinghouse Electric Corp
5930-00-940-9133PM21678 INTERCHANGEABLE
Switch,push
Mason Electric Co. Dba Mason Controls
5315-01-320-536721678 INTERCHANGEABLE
Pin,straight,headless
Parker Hannifin Corporation Div Hydraulic Systems Division
Cross-Reference Index
Part NumberManufacturer
21678 PRIMARY Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems (USA)
Related Parts
5315-00-003-4107INTERCHANGEABLE
KEY,MACHINE
21678
2995-00-022-5135INTERCHANGEABLE
CONDUIT,CABLE OVERT
20395-1
5935-00-201-3099INTERCHANGEABLE
STRAP NUT,PLUG-IN ELECTRONIC COM
216-7-8
5970-00-310-8689INTERCHANGEABLE
DISK
M7415134SUB13PT12
5930-00-940-9133INTERCHANGEABLE
SWITCH,PUSH
PM21678
5315-01-320-5367INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
21678

Frequently Asked Questions

What is NSN 6610-00-544-5554?

NSN 6610-00-544-5554 is a Gear Assy, manufactured by Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems, classified under FSC 6610 (No Item Name Available). Status: active.

What are the part numbers for NSN 6610-00-544-5554?

NSN 6610-00-544-5554 has 1 cross-referenced part number: 21678 (Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems).

What NSN replaces 6610-00-544-5554?

There are 6 known substitutes for 6610-00-544-5554: 5315-00-003-4107, 2995-00-022-5135, 5935-00-201-3099 and 3 more. Verify interchangeability with system specifications before substitution.

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