PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5661Extension,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-00-243-7328 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-243-7328 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-243-7328. Primary manufacturer part number: 5661.
Features
  • Extension,socket Wrench — FSC 5120
  • Features Provided: MANUAL TOOL
  • Surface Treatment: CHROMIUM OVERALL
  • Drive End Shape: SQUARE SECOND END EXTERNAL
  • Style Designator: RIGID
  • Drive Surface Size: 0.750 INCHES NOMINAL BOTH ENDS IN
  • Specification/standard Data: 0U583-SAE AS4283 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Nondefinitive Spec/std Data: 2 TYPE AND 2 CLASS
Applications
  • Applications requiring Steel Overall construction
General Description

The Extension,socket Wrench, cataloged under National Stock Number 5120-00-243-7328, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is The Stanley Works Dba Stanley Proto. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 27 commercial cross-references from 21 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-00-243-7328
Primary Part Number5661
Item NameExtension,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusCANCELLED
Features ProvidedMANUAL TOOL
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE SECOND END EXTERNAL
Style DesignatorRIGID
Drive Surface Size0.750 INCHES NOMINAL BOTH ENDS IN
Specification/standard Data0U583-SAE AS4283 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Nondefinitive Spec/std Data2 TYPE AND 2 CLASS
Outside Diameter1.000 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Drive End ShapeSQUARE FIRST END INTERNAL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5935-00-078-6918 INTERCHANGEABLE
Connector,receptacle,electrical
9390-00-078-88275661 INTERCHANGEABLE
Nonmetallic Special Shaped Secti
Kirkhill Inc Div Kirkhill Inc, Haskon Division
5999-00-215-7295SIB962 INTERCHANGEABLE
Clip,electrical
Sigmation Inc
5120-00-227-8074JHWS-115P INTERCHANGEABLE
Extension,socket Wrench
Williams J H Industrial Products Inc
5120-00-227-8079 INTERCHANGEABLE
Extension,socket Wrench
5120-00-227-8105 INTERCHANGEABLE
Extension,socket Wrench
5120-00-227-8107 INTERCHANGEABLE
Extension,socket Wrench
5120-00-240-8704 INTERCHANGEABLE
Extension,socket Wrench
5120-00-240-8705 INTERCHANGEABLE
Extension,socket Wrench
5120-00-240-8706 INTERCHANGEABLE
Extension,socket Wrench
Cross-Reference Index
Part NumberManufacturer
5661 The Stanley Works Dba Stanley Proto (USA)
B107.10 TY2CL2STA General Services Administration Federal Supply Service (USA)
GGG-W-641 TY4CL4STA General Services Administration Federal Supply Service (USA)
3819331 Oshkosh Corp (USA)
B107.10M TY2CL2ST1 General Services Administration Federal Supply Service (USA)
1AP35 W.w. Grainger, Inc. Div Government Sales Division (USA)
GGG-W-641 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
8H8548 Caterpillar Inc Div Caterpillar Defense (USA)
41B309-20 Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA)
B107.10M The American Society of Mechanical Engineers (USA)
AS4283 Society of Automotive Engineers Inc (USA)
1U-7095 Perkins Engines Company Ltd (GBR)
A-A-2170 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
13912 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
10424473 Nimikkeistokeskus Ncb Finland (FIN)
13912 Apex Tool Group, Llc Dba Nicholson (USA)
AS4283 TY2CL2 General Services Administration Federal Supply Service (USA)
AS4283 Sae International Dba Sae International (USA)
B107.10 The American Society of Mechanical Engineers (USA)
13912 Easco Hand Tools Inc (USA)
Related Parts
5935-00-078-6918INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
9390-00-078-8827INTERCHANGEABLE
NONMETALLIC SPECIAL SHAPED SECTI
5661
5999-00-215-7295INTERCHANGEABLE
CLIP,ELECTRICAL
SIB962
5120-00-227-8074INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
JHWS-115P
5120-00-227-8079INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-227-8105INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-227-8107INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-240-8704INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-240-8705INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-240-8706INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-243-1689INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-243-1691INTERCHANGEABLE
EXTENSION,SOCKET WRENCH

Frequently Asked Questions

What is NSN 5120-00-243-7328?

NSN 5120-00-243-7328 is a Extension,socket Wrench, manufactured by The Stanley Works Dba Stanley Proto, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-00-243-7328?

NSN 5120-00-243-7328 has 27 cross-referenced part numbers: 5661 (The Stanley Works Dba Stanley Proto), B107.10 TY2CL2STA (General Services Administration Federal Supply Service), GGG-W-641 TY4CL4STA (General Services Administration Federal Supply Service), 3819331 (Oshkosh Corp), B107.10M TY2CL2ST1 (General Services Administration Federal Supply Service) and 22 more.

What NSN replaces 5120-00-243-7328?

There are 12 known substitutes for 5120-00-243-7328: 5935-00-078-6918, 9390-00-078-8827, 5999-00-215-7295 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5661?

Key specifications for 5661: Features Provided: MANUAL TOOL; Surface Treatment: CHROMIUM OVERALL; Drive End Shape: SQUARE SECOND END EXTERNAL; Style Designator: RIGID. 11 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-00-243-7328 still in active supply?

NSN 5120-00-243-7328 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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