PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5256Adapter,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9533 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9533 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9533. Primary manufacturer part number: 5256.
Features
  • Adapter,socket Wrench — FSC 5120
  • Outside Diameter: 0.625 INCHES MAXIMUM IN
  • Surface Treatment: CHROMIUM OVERALL
  • Features Provided: MANUAL TOOL
  • Drive Surface Size: 0.250 INCHES NOMINAL FIRST END IN
  • Style Designator: EXTERNAL-INTERNAL
  • Drive End Shape: SQUARE SECOND END EXTERNAL
  • Material: STEEL OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Adapter,socket Wrench, cataloged under National Stock Number 5120-01-399-9533, 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 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-399-9533
Primary Part Number5256
Item NameAdapter,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusACTIVE
Outside Diameter0.625 INCHES MAXIMUM IN
Surface TreatmentCHROMIUM OVERALL
Features ProvidedMANUAL TOOL
Drive Surface Size0.250 INCHES NOMINAL FIRST END IN
Style DesignatorEXTERNAL-INTERNAL
Drive End ShapeSQUARE SECOND END EXTERNAL
MaterialSTEEL OVERALL
Drive Surface Size0.375 INCHES NOMINAL SECOND END IN
Drive End ShapeSQUARE FIRST END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5915-00-043-2580241-0302-000 INTERCHANGEABLE
Filter,low Pass
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5975-00-056-35763426 INTERCHANGEABLE
Box Connector,electrical
Raco, a Division of Hubbell Incorporated(delaware)
4820-00-142-1992131-50775 INTERCHANGEABLE
Cock,shutoff,screw Stem
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5935-00-660-70085256 INTERCHANGEABLE
Connector,receptacle,electrical
Hubbell Incorporated (delaware) Dba Wiring Device-Kellems Division
6105-00-798-26665256 INTERCHANGEABLE
Parts Kit,electric Motor
Hydro-Aire Aerospace Corp
1730-00-967-7970 INTERCHANGEABLE
Pump,hydraulic,hand
5950-01-080-8148 INTERCHANGEABLE
Reactor
4130-01-099-17711620-6-5/32-1 1/2 INTERCHANGEABLE
Distributor,refrigerant
Parker-Hannifin Corp Div Sporlan Division
5950-01-298-78445256 INTERCHANGEABLE
Coil,radio Frequency
U S Dept of Transportation Federal Aviation Administration
4940-01-356-8235 INTERCHANGEABLE
Tube,testing Kit
Cross-Reference Index
Part NumberManufacturer
5256 PRIMARY The Stanley Works Dba Stanley Proto (USA)
1AF68 W.w. Grainger, Inc. Div Government Sales Division (USA)
Related Parts
5915-00-043-2580INTERCHANGEABLE
FILTER,LOW PASS
241-0302-000
5975-00-056-3576INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
3426
4820-00-142-1992INTERCHANGEABLE
COCK,SHUTOFF,SCREW STEM
131-50775
5935-00-660-7008INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
5256
6105-00-798-2666INTERCHANGEABLE
PARTS KIT,ELECTRIC MOTOR
5256
1730-00-967-7970INTERCHANGEABLE
PUMP,HYDRAULIC,HAND
5950-01-080-8148INTERCHANGEABLE
REACTOR
4130-01-099-1771INTERCHANGEABLE
DISTRIBUTOR,REFRIGERANT
1620-6-5/32-1 1/2
5950-01-298-7844INTERCHANGEABLE
COIL,RADIO FREQUENCY
5256
4940-01-356-8235INTERCHANGEABLE
TUBE,TESTING KIT
5120-01-591-4568INTERCHANGEABLE
INSERTER,BEARING AND BUSHING
E5256
5331-01-592-6422INTERCHANGEABLE
O-RING
5-256

Frequently Asked Questions

What is NSN 5120-01-399-9533?

NSN 5120-01-399-9533 is a Adapter,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 5120-01-399-9533?

NSN 5120-01-399-9533 has 2 cross-referenced part numbers: 5256 (The Stanley Works Dba Stanley Proto), 1AF68 (W.w. Grainger, Inc. Div Government Sales Division).

What NSN replaces 5120-01-399-9533?

There are 12 known substitutes for 5120-01-399-9533: 5915-00-043-2580, 5975-00-056-3576, 4820-00-142-1992 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5256?

Key specifications for 5256: Outside Diameter: 0.625 INCHES MAXIMUM IN; Surface Treatment: CHROMIUM OVERALL; Features Provided: MANUAL TOOL; Drive Surface Size: 0.250 INCHES NOMINAL FIRST END IN. 10 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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