PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51709Cock Assembly

The Chelsea Clock Llc · NSN 6645-00-163-0511 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-163-0511 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-163-0511. Primary manufacturer part number: 51709.
Features
  • Cock Assembly — FSC 6645
  • General Characteristics Item Description: BRASS; FAST TO SLOW SCALE
  • 3 verified cross-references
  • Primary manufacturer: The Chelsea Clock Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Cock Assembly, cataloged under National Stock Number 6645-00-163-0511, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is The Chelsea Clock Llc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6645-00-163-0511
Primary Part Number51709
Item NameCock Assembly
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerThe Chelsea Clock Llc
StatusACTIVE
General Characteristics Item DescriptionBRASS; FAST TO SLOW SCALE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5998-00-064-557051914 INTERCHANGEABLE
Printed Wiring Board
L3harris Technologies, Inc. Div Space and Airborne Systems
4730-00-092-9670 INTERCHANGEABLE
Union,pipe
5120-00-240-5282SC-B-70418-3 INTERCHANGEABLE
Key,socket Head Screw
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
3030-00-609-945817490 INTERCHANGEABLE
Belt,v
Carlisle Power Transmission Products Inc
3950-01-069-851051914 INTERCHANGEABLE
Hub Assembly,planetary
Paccar Winch Inc Dba Paccar Winch Division
2590-01-181-715518032 INTERCHANGEABLE
Filter Element,fluid
Baldwin Filters
6230-01-649-5898517-09 INTERCHANGEABLE
Light,marker,distress
Eastern Aero Marine, Inc. Dba Eastern Aero Marine Inc Div Eam Aviation
7690-01-716-221751709 INTERCHANGEABLE
Label
Eaton Aerospace Llc Dba Eaton Aerospace Jackson
Cross-Reference Index
Part NumberManufacturer
51709 PRIMARY The Chelsea Clock Llc (USA)
5-1-91-4 Naval Observatory (USA)
11-1CHC0 Naval Observatory (USA)
Related Parts
5998-00-064-5570INTERCHANGEABLE
PRINTED WIRING BOARD
51914
4730-00-092-9670INTERCHANGEABLE
UNION,PIPE
5120-00-240-5282INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
SC-B-70418-3
3030-00-609-9458INTERCHANGEABLE
BELT,V
17490
3950-01-069-8510INTERCHANGEABLE
HUB ASSEMBLY,PLANETARY
51914
2590-01-181-7155INTERCHANGEABLE
FILTER ELEMENT,FLUID
18032
6230-01-649-5898INTERCHANGEABLE
LIGHT,MARKER,DISTRESS
517-09
7690-01-716-2217INTERCHANGEABLE
LABEL
51709

Frequently Asked Questions

What is NSN 6645-00-163-0511?

NSN 6645-00-163-0511 is a Cock Assembly, manufactured by The Chelsea Clock Llc, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-00-163-0511?

NSN 6645-00-163-0511 has 3 cross-referenced part numbers: 51709 (The Chelsea Clock Llc), 5-1-91-4 (Naval Observatory), 11-1CHC0 (Naval Observatory).

What NSN replaces 6645-00-163-0511?

There are 8 known substitutes for 6645-00-163-0511: 5998-00-064-5570, 4730-00-092-9670, 5120-00-240-5282 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 51709?

Key specifications for 51709: General Characteristics Item Description: BRASS; FAST TO SLOW SCALE. 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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