PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1520R-S250-OCXOClock Movement,electric

Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan · NSN 6645-01-618-1061 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-01-618-1061 — this item is cataloged by the U.S. Government under National Stock Number 6645-01-618-1061. Primary manufacturer part number: 1520R-S250-OCXO.
Features
  • Clock Movement,electric — FSC 6645
  • 2 verified cross-references
  • Primary manufacturer: Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Clock Movement,electric, cataloged under National Stock Number 6645-01-618-1061, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6645-01-618-1061
Primary Part Number1520R-S250-OCXO
Item NameClock Movement,electric
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerLockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3110-00-554-5302 INTERCHANGEABLE
Bearing,ball,annular
5330-00-678-0214S250 INTERCHANGEABLE
Seal,plain Encased
Thomson Industries Inc
2990-00-678-58921T3354 INTERCHANGEABLE
Pipe,exhaust
Arvin Industries Inc
5935-00-940-7320S250 INTERCHANGEABLE
Plug,telephone
Switchcraft Inc.
7021-01-235-5937S250 INTERCHANGEABLE
Computer,digital
Data General Corporation
4730-01-289-1541 INTERCHANGEABLE
Adapter,straight,pipe to Hose
3460-01-353-8117S-250 INTERCHANGEABLE
Sleeve,expansion Mandrel
Sunnen Products Co
5895-01-506-6072S250 INTERCHANGEABLE
Modem,communications
Symmetricom Puerto Rico Inc
7035-01-539-3781S-250 INTERCHANGEABLE
Server,automatic Data Processing
Symmetricom, Inc
9150-01-583-8232 INTERCHANGEABLE
Calibrating Oil,standard
Cross-Reference Index
Part NumberManufacturer
S250 Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan (USA)
1520R-S250-OCXO PRIMARY Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan (USA)
Related Parts
3110-00-554-5302INTERCHANGEABLE
BEARING,BALL,ANNULAR
5330-00-678-0214INTERCHANGEABLE
SEAL,PLAIN ENCASED
S250
2990-00-678-5892INTERCHANGEABLE
PIPE,EXHAUST
1T3354
5935-00-940-7320INTERCHANGEABLE
PLUG,TELEPHONE
S250
7021-01-235-5937INTERCHANGEABLE
COMPUTER,DIGITAL
S250
4730-01-289-1541INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO HOSE
3460-01-353-8117INTERCHANGEABLE
SLEEVE,EXPANSION MANDREL
S-250
5895-01-506-6072INTERCHANGEABLE
MODEM,COMMUNICATIONS
S250
7035-01-539-3781INTERCHANGEABLE
SERVER,AUTOMATIC DATA PROCESSING
S-250
9150-01-583-8232INTERCHANGEABLE
CALIBRATING OIL,STANDARD
5895-01-587-9922INTERCHANGEABLE
S-250
S-250
6645-01-601-0715INTERCHANGEABLE
GENERATOR,TIME CODE
1520R-S250-OCXO

Frequently Asked Questions

What is NSN 6645-01-618-1061?

NSN 6645-01-618-1061 is a Clock Movement,electric, manufactured by Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-01-618-1061?

NSN 6645-01-618-1061 has 2 cross-referenced part numbers: S250 (Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan), 1520R-S250-OCXO (Lockheed Martin Corp Dba Lockheed Martin Div Mst - Eagan).

What NSN replaces 6645-01-618-1061?

There are 12 known substitutes for 6645-01-618-1061: 3110-00-554-5302, 5330-00-678-0214, 2990-00-678-5892 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1520R-S250-OCXO?

Key specifications for 1520R-S250-OCXO: Part Name Assigned by Controlling Agency: GPS CLOCK; End Item Identification: MICROEARTS (MEARTS). 2 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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