PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

J5259Extension,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9615 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9615 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9615. Primary manufacturer part number: J5259.
Features
  • Extension,socket Wrench — FSC 5120
  • Drive End Shape: SQUARE FIRST END INTERNAL
  • Material: STEEL OVERALL
  • Features Provided: MANUAL TOOL
  • Surface Treatment: CHROMIUM OVERALL
  • Drive End Shape: SQUARE SECOND END EXTERNAL
  • Style Designator: RIGID
  • Drive Surface Size: 0.375 INCHES NOMINAL BOTH ENDS IN
Applications
  • Applications requiring Steel Overall construction
General Description

The Extension,socket Wrench, cataloged under National Stock Number 5120-01-399-9615, 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 7 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-399-9615
Primary Part NumberJ5259
Item NameExtension,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusCANCELLED
Drive End ShapeSQUARE FIRST END INTERNAL
MaterialSTEEL OVERALL
Features ProvidedMANUAL TOOL
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE SECOND END EXTERNAL
Style DesignatorRIGID
Drive Surface Size0.375 INCHES NOMINAL BOTH ENDS IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
2995-00-013-3707DS-934405 INTERCHANGEABLE
Plunger,dual Control
Eaton Aerospace, Llc Dba Jackson South
4510-00-062-0134 INTERCHANGEABLE
Faucet,double
5360-00-231-3114525-9 INTERCHANGEABLE
Spring,helical,compression
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
4820-00-275-222720261 INTERCHANGEABLE
Cock,drain
Jewell Instruments Llc
3120-00-359-13331229R720 INTERCHANGEABLE
Bearing,washer,thrust
Meritor Heavy Vehicle Systems, Llc
5330-00-765-2918G8-179160 INTERCHANGEABLE
Gasket
Norwalk Compreseer Company Inc Dba Norwalk Compressor Company
5950-00-797-1784 INTERCHANGEABLE
Transformer,power
5915-00-981-3419 INTERCHANGEABLE
Filter,low Pass
5975-01-004-15355259 INTERCHANGEABLE
Box Connector,electrical
Abb Installation Products Inc
5307-01-179-90035259 INTERCHANGEABLE
Stud,plain
Erie Malleable Iron Co
Cross-Reference Index
Part NumberManufacturer
J5259 Henchman Group Pty Ltd the Trustee for Henchman Unit Trust (AUS)
J5259 Henchman Products Pty Ltd (AUS)
5259 The Stanley Works Dba Stanley Proto (USA)
1AH73 W.w. Grainger, Inc. Div Government Sales Division (USA)
J5259 PRIMARY The Stanley Works Dba Stanley Proto (USA)
Related Parts
2995-00-013-3707INTERCHANGEABLE
PLUNGER,DUAL CONTROL
DS-934405
4510-00-062-0134INTERCHANGEABLE
FAUCET,DOUBLE
5360-00-231-3114INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
525-9
4820-00-275-2227INTERCHANGEABLE
COCK,DRAIN
20261
3120-00-359-1333INTERCHANGEABLE
BEARING,WASHER,THRUST
1229R720
5330-00-765-2918INTERCHANGEABLE
GASKET
G8-179160
5950-00-797-1784INTERCHANGEABLE
TRANSFORMER,POWER
5915-00-981-3419INTERCHANGEABLE
FILTER,LOW PASS
5975-01-004-1535INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
5259
5307-01-179-9003INTERCHANGEABLE
STUD,PLAIN
5259
3020-01-529-9505INTERCHANGEABLE
GEAR,SPUR
5259

Frequently Asked Questions

What is NSN 5120-01-399-9615?

NSN 5120-01-399-9615 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 5120-01-399-9615?

NSN 5120-01-399-9615 has 5 cross-referenced part numbers: J5259 (Henchman Group Pty Ltd the Trustee for Henchman Unit Trust), J5259 (Henchman Products Pty Ltd), 5259 (The Stanley Works Dba Stanley Proto), 1AH73 (W.w. Grainger, Inc. Div Government Sales Division), J5259 (The Stanley Works Dba Stanley Proto).

What NSN replaces 5120-01-399-9615?

There are 11 known substitutes for 5120-01-399-9615: 2995-00-013-3707, 4510-00-062-0134, 5360-00-231-3114 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of J5259?

Key specifications for J5259: Drive End Shape: SQUARE FIRST END INTERNAL; Material: STEEL OVERALL; Overall Length: 1.750 INCHES NOMINAL IN; Features Provided: MANUAL TOOL. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-399-9615 still in active supply?

NSN 5120-01-399-9615 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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