PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5660Extension,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9736 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9736 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9736. Primary manufacturer part number: 5660.
Features
  • Extension,socket Wrench — FSC 5120
  • Drive Surface Size: 0.750 INCHES NOMINAL BOTH ENDS IN
  • Features Provided: MANUAL TOOL
  • Material: STEEL OVERALL
  • Specification/standard Data: 0U583-SAE AS4283 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Nondefinitive Spec/std Data: 2 TYPE AND 2 CLASS
  • Drive End Shape: SQUARE SECOND END EXTERNAL
  • Surface Treatment: CHROMIUM OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Extension,socket Wrench, cataloged under National Stock Number 5120-01-399-9736, 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 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-399-9736
Primary Part Number5660
Item NameExtension,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusCANCELLED
Drive Surface Size0.750 INCHES NOMINAL BOTH ENDS IN
Features ProvidedMANUAL TOOL
MaterialSTEEL OVERALL
Specification/standard Data0U583-SAE AS4283 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Nondefinitive Spec/std Data2 TYPE AND 2 CLASS
Drive End ShapeSQUARE SECOND END EXTERNAL
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE FIRST END INTERNAL
Style DesignatorRIGID
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 5
6110-00-096-60162547 INTERCHANGEABLE
Regulator,voltage
Electric Regulator Corp
5307-00-499-8312 INTERCHANGEABLE
Stud,plain
6640-01-196-17235660 INTERCHANGEABLE
Flask,volumetric
Corning Glass Works
5130-01-397-95165660 INTERCHANGEABLE
Router,electric,portable
Milwaukee Electric Tool Corp Dba Milwaukee Electric Tools
7530-01-399-3702 INTERCHANGEABLE
Label
Cross-Reference Index
Part NumberManufacturer
5660 The Stanley Works Dba Stanley Proto (USA)
AS4283 Sae International Dba Sae International (USA)
J5660 The Stanley Works Dba Stanley Proto (USA)
AS4283 TY2CL2 General Services Administration Federal Supply Service (USA)
1AP34 W.w. Grainger, Inc. Div Government Sales Division (USA)
Related Parts
6110-00-096-6016INTERCHANGEABLE
REGULATOR,VOLTAGE
2547
5307-00-499-8312INTERCHANGEABLE
STUD,PLAIN
6640-01-196-1723INTERCHANGEABLE
FLASK,VOLUMETRIC
5660
5130-01-397-9516INTERCHANGEABLE
ROUTER,ELECTRIC,PORTABLE
5660
7530-01-399-3702INTERCHANGEABLE
LABEL

Frequently Asked Questions

What is NSN 5120-01-399-9736?

NSN 5120-01-399-9736 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 5120-01-399-9736?

NSN 5120-01-399-9736 has 5 cross-referenced part numbers: 5660 (The Stanley Works Dba Stanley Proto), AS4283 (Sae International Dba Sae International), J5660 (The Stanley Works Dba Stanley Proto), AS4283 TY2CL2 (General Services Administration Federal Supply Service), 1AP34 (W.w. Grainger, Inc. Div Government Sales Division).

What NSN replaces 5120-01-399-9736?

There are 5 known substitutes for 5120-01-399-9736: 6110-00-096-6016, 5307-00-499-8312, 6640-01-196-1723 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5660?

Key specifications for 5660: Overall Length: 4.000 INCHES NOMINAL IN; Drive Surface Size: 0.750 INCHES NOMINAL BOTH ENDS IN; Features Provided: MANUAL TOOL; Material: STEEL OVERALL. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-399-9736 still in active supply?

NSN 5120-01-399-9736 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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