PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

J5268Extension,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-335-1055 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-335-1055 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-335-1055. Primary manufacturer part number: J5268.
Features
  • Extension,socket Wrench — FSC 5120
  • Features Provided: MANUAL TOOL
  • Drive Surface Size: 0.375 INCHES NOMINAL BOTH ENDS IN
  • Drive End Shape: SQUARE FIRST END INTERNAL
  • Style Designator: FLEXIBLE
  • Drive End Shape: SQUARE SECOND END EXTERNAL
  • Surface Treatment: CHROMIUM OVERALL
  • Material: STEEL OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Extension,socket Wrench, cataloged under National Stock Number 5120-01-335-1055, 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 8 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-335-1055
Primary Part NumberJ5268
Item NameExtension,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusACTIVE
Features ProvidedMANUAL TOOL
Drive Surface Size0.375 INCHES NOMINAL BOTH ENDS IN
Drive End ShapeSQUARE FIRST END INTERNAL
Style DesignatorFLEXIBLE
Drive End ShapeSQUARE SECOND END EXTERNAL
Surface TreatmentCHROMIUM OVERALL
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5120-00-022-9797 INTERCHANGEABLE
Extension,socket Wrench
5120-00-242-3433 INTERCHANGEABLE
Punch,starter
5330-00-251-47178179A INTERCHANGEABLE
Gasket
Brinkley Technology Group Llc Dba Hercules Manufacturing
4730-00-337-499652-68 INTERCHANGEABLE
Swivel Joint,hydraulic
Arkwin Industries, Inc. Dba Arkwin Industries Inc
5325-00-358-994211A6549 INTERCHANGEABLE
Ring,retaining
Napco International Llc Dba Napco International Inc
5910-01-010-1612922-0583-230 INTERCHANGEABLE
Capacitor,variable,air Dielectri
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5995-01-221-73151640969-10 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Raytheon Company Div Rmd Strategic
5330-01-442-7216 INTERCHANGEABLE
Seal,plain
4820-01-578-8022NB01025E INTERCHANGEABLE
Valve,gate
Curtiss-Wright Flow Control Corporation Dba Curtiss-Wright Flow Control Co Div Curtiss-Wright / Nu-Torque
4910-01-598-9791 INTERCHANGEABLE
Stand,vehicle Support
Cross-Reference Index
Part NumberManufacturer
BOF917101 Cromwell Tools Ltd (GBR)
J5268 PRIMARY The Stanley Works Dba Stanley Proto (USA)
FX61A Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
5268 The Stanley Works Dba Stanley Proto (USA)
BFE-8 PRIMARY Williams J H Industrial Products Inc (USA)
PT05823015B Marshall Specialist Vehicles Ltd (GBR)
FX61 Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
5120PL1076537 Jednolity Indeks Materialowy - Uniform Material Index (POL)
Related Parts
5120-00-022-9797INTERCHANGEABLE
EXTENSION,SOCKET WRENCH
5120-00-242-3433INTERCHANGEABLE
PUNCH,STARTER
5330-00-251-4717INTERCHANGEABLE
GASKET
8179A
4730-00-337-4996INTERCHANGEABLE
SWIVEL JOINT,HYDRAULIC
52-68
5325-00-358-9942INTERCHANGEABLE
RING,RETAINING
11A6549
5910-01-010-1612INTERCHANGEABLE
CAPACITOR,VARIABLE,AIR DIELECTRI
922-0583-230
5995-01-221-7315INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
1640969-10
5330-01-442-7216INTERCHANGEABLE
SEAL,PLAIN
4820-01-578-8022INTERCHANGEABLE
VALVE,GATE
NB01025E
4910-01-598-9791INTERCHANGEABLE
STAND,VEHICLE SUPPORT

Frequently Asked Questions

What is NSN 5120-01-335-1055?

NSN 5120-01-335-1055 is a Extension,socket Wrench, manufactured by The Stanley Works Dba Stanley Proto, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-335-1055?

NSN 5120-01-335-1055 has 8 cross-referenced part numbers: BOF917101 (Cromwell Tools Ltd), J5268 (The Stanley Works Dba Stanley Proto), FX61A (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), 5268 (The Stanley Works Dba Stanley Proto), BFE-8 (Williams J H Industrial Products Inc) and 3 more.

What NSN replaces 5120-01-335-1055?

There are 10 known substitutes for 5120-01-335-1055: 5120-00-022-9797, 5120-00-242-3433, 5330-00-251-4717 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of J5268?

Key specifications for J5268: Overall Length: 8.000 INCHES NOMINAL IN; Features Provided: MANUAL TOOL; Drive Surface Size: 0.375 INCHES NOMINAL BOTH ENDS IN; Drive End Shape: SQUARE FIRST END INTERNAL. 8 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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