PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

66E3-25C0NNECTINGBL0CKElectronic Components Assembly

American Telephone and Telegraph Co · NSN 5998-00-727-4127 · FSC 5998 · Circuit Card Assembly
Verified by PartsTable
NSN 5998-00-727-4127 — this item is cataloged by the U.S. Government under National Stock Number 5998-00-727-4127. Primary manufacturer part number: 66E3-25C0NNECTINGBL0CK.
Features
  • Electronic Components Assembly — FSC 5998
  • 12 verified cross-references
  • Primary manufacturer: American Telephone and Telegraph Co
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Electronic Components Assembly, cataloged under National Stock Number 5998-00-727-4127, is classified within Federal Supply Class 5998 (Circuit Card Assembly) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is American Telephone and Telegraph Co. This item has 12 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5998-00-727-4127
Primary Part Number66E3-25C0NNECTINGBL0CK
Item NameElectronic Components Assembly
FSC / FSG5998 / 59 — Circuit Card Assembly
ManufacturerAmerican Telephone and Telegraph Co
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
Successor5999-00-115-1084 (2018)
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeZZ
Weight1.0000 lbs
Cube0.0458 cu ft
Verified Substitutes 3
5999-00-115-10842018 SUCCESSOR
Contact,electrical
Mission Systems Davenport Inc.
5999-00-502-135531-929 SUCCESSOR
Contact,electrical
Amphenol Corporation Div Amphenol Rf
6625-01-658-86072018 SUCCESSOR
Holding,fixture
Fluke Corp
Cross-Reference Index
Part NumberManufacturer
66E3-25C0NNECTINGBL0CK American Telephone and Telegraph Co (USA)
100-009-968 American Telephone and Telegraph Co (USA)
66E3-25BL0CKC0NNECTING American Telephone and Telegraph Co (USA)
SC66E3-49 Siemon Company the (USA)
R66E3-25G Reliance Comm/tec Corp Reliable Electric Div Utility Products (USA)
2018 Reliance Comm/tec Corp Reliable Electric Div Utility Products (USA)
100 009 968 American Telephone and Telegraph Co (USA)
SE66E3-60 Suttle Apparatus Div Suttle Corp (USA)
SE66E3-49 Suttle Apparatus Div Suttle Corp (USA)
S66E3-25-49 Siemon Company the (USA)
66E3 American Telephone and Telegraph Co (USA)
CAC66E3-25-49 Corning Cable Systems Llc Cac Equipment (USA)
Related Parts
SUCCESSOR 5999-00-115-1084 Contact,electrical · 2018
5999-00-502-1355SUCCESSOR
CONTACT,ELECTRICAL
31-929
6625-01-658-8607SUCCESSOR
HOLDING,FIXTURE
2018

Frequently Asked Questions

What is NSN 5998-00-727-4127?

NSN 5998-00-727-4127 is a Electronic Components Assembly, manufactured by American Telephone and Telegraph Co, classified under FSC 5998 (Circuit Card Assembly). Status: cancelled.

What are the part numbers for NSN 5998-00-727-4127?

NSN 5998-00-727-4127 has 12 cross-referenced part numbers: 66E3-25C0NNECTINGBL0CK (American Telephone and Telegraph Co), 100-009-968 (American Telephone and Telegraph Co), 66E3-25BL0CKC0NNECTING (American Telephone and Telegraph Co), SC66E3-49 (Siemon Company the), R66E3-25G (Reliance Comm/tec Corp Reliable Electric Div Utility Products) and 7 more.

What NSN replaces 5998-00-727-4127?

There are 3 known substitutes for 5998-00-727-4127: 5999-00-115-1084, 5999-00-502-1355, 6625-01-658-8607. Verify interchangeability with system specifications before substitution.

What are the specifications of 66E3-25C0NNECTINGBL0CK?

Key specifications for 66E3-25C0NNECTINGBL0CK: Overall Height: 2.438 INCHES NOMINAL IN; Special Features: CASE 1; CONNECTING BLOCK 5; CONNECTOR PLUG 1; Overall Width: 4.625 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: FSC APPLICATION DATA:TELEPHONE AND TELEGRAPH EQUIPMENT. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5998-00-727-4127 still in active supply?

NSN 5998-00-727-4127 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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