PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5254Adapter,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9665 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9665 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9665. Primary manufacturer part number: 5254.
Features
  • Adapter,socket Wrench — FSC 5120
  • Style Designator: EXTERNAL-INTERNAL
  • Drive Surface Size: 0.500 INCHES NOMINAL FIRST END IN
  • Material: STEEL OVERALL
  • Drive End Shape: SQUARE FIRST END INTERNAL
  • Features Provided: MANUAL TOOL
  • Drive Surface Size: 0.375 INCHES NOMINAL SECOND END IN
  • Drive End Shape: SQUARE SECOND END EXTERNAL
Applications
  • Applications requiring Steel Overall construction
General Description

The Adapter,socket Wrench, cataloged under National Stock Number 5120-01-399-9665, 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-399-9665
Primary Part Number5254
Item NameAdapter,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusACTIVE
Style DesignatorEXTERNAL-INTERNAL
Drive Surface Size0.500 INCHES NOMINAL FIRST END IN
MaterialSTEEL OVERALL
Drive End ShapeSQUARE FIRST END INTERNAL
Features ProvidedMANUAL TOOL
Drive Surface Size0.375 INCHES NOMINAL SECOND END IN
Drive End ShapeSQUARE SECOND END EXTERNAL
Surface TreatmentCHROMIUM OVERALL
Outside Diameter1.000 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
5950-00-100-4557WM-5254 INTERCHANGEABLE
Transformer,power
Magnetic Components Inc
6685-00-113-76765254 INTERCHANGEABLE
Thermometer,self-Indicating
Weksler Glass Thermometer Corp
5120-00-261-2824 INTERCHANGEABLE
Socket,socket Wrench
4320-00-431-1685N012-05012 INTERCHANGEABLE
Commutator End Bell
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
5120-00-473-70305254 INTERCHANGEABLE
Extractor Wick
Carrasco, Hernan Dba Tc Electric
5975-00-615-91745254 INTERCHANGEABLE
Box Connector,electrical
Abb Installation Products Inc
5310-00-843-9841 INTERCHANGEABLE
Washer,lock
5950-01-071-3199480877-1 INTERCHANGEABLE
Transformer,pulse
Raytheon Company Dba Raytheon Co
5310-01-179-90025254 INTERCHANGEABLE
Nut,plain,hexagon
Erie Malleable Iron Co
5950-01-208-50815254325 INTERCHANGEABLE
Coil,radio Frequency
Bourns Inc
Cross-Reference Index
Part NumberManufacturer
1AH99 W.w. Grainger, Inc. Div Government Sales Division (USA)
5254 PRIMARY The Stanley Works Dba Stanley Proto (USA)
Related Parts
5950-00-100-4557INTERCHANGEABLE
TRANSFORMER,POWER
WM-5254
6685-00-113-7676INTERCHANGEABLE
THERMOMETER,SELF-INDICATING
5254
5120-00-261-2824INTERCHANGEABLE
SOCKET,SOCKET WRENCH
4320-00-431-1685INTERCHANGEABLE
COMMUTATOR END BELL
N012-05012
5120-00-473-7030INTERCHANGEABLE
EXTRACTOR WICK
5254
5975-00-615-9174INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
5254
5310-00-843-9841INTERCHANGEABLE
WASHER,LOCK
5950-01-071-3199INTERCHANGEABLE
TRANSFORMER,PULSE
480877-1
5310-01-179-9002INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5254
5950-01-208-5081INTERCHANGEABLE
COIL,RADIO FREQUENCY
5254325
4220-01-247-5511INTERCHANGEABLE
GAGE,DEPTH AND PRESSURE DIVER'S
5254

Frequently Asked Questions

What is NSN 5120-01-399-9665?

NSN 5120-01-399-9665 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 5120-01-399-9665?

NSN 5120-01-399-9665 has 2 cross-referenced part numbers: 1AH99 (W.w. Grainger, Inc. Div Government Sales Division), 5254 (The Stanley Works Dba Stanley Proto).

What NSN replaces 5120-01-399-9665?

There are 11 known substitutes for 5120-01-399-9665: 5950-00-100-4557, 6685-00-113-7676, 5120-00-261-2824 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5254?

Key specifications for 5254: Style Designator: EXTERNAL-INTERNAL; Drive Surface Size: 0.500 INCHES NOMINAL FIRST END IN; Overall Length: 1.406 INCHES NOMINAL IN; Material: STEEL OVERALL. 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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