PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

X126Socket,socket Wrench

Stanley Industrial & Automotive Llc · NSN 5120-01-366-8278 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-366-8278 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-366-8278. Primary manufacturer part number: X126.
Features
  • Socket,socket Wrench — FSC 5120
  • Style Designator: INTERNAL-INTERNAL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Features Provided: MANUAL TOOL
  • Surface Treatment: CHROMIUM OVERALL
  • Wrenching Surface Shape: 6 POINT SINGLE END INTERNAL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Nondefinitive Spec/std Data: 1 TYPE
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-366-8278, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Stanley Industrial & Automotive Llc. Government technical data includes 10 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. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-366-8278
Primary Part NumberX126
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerStanley Industrial & Automotive Llc
StatusACTIVE
Style DesignatorINTERNAL-INTERNAL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Features ProvidedMANUAL TOOL
Surface TreatmentCHROMIUM OVERALL
Wrenching Surface Shape6 POINT SINGLE END INTERNAL
Drive End ShapeSQUARE SINGLE END INTERNAL
Nondefinitive Spec/std Data1 TYPE
Wrenching Surface Size0.375 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Specification/standard Data05047-ASME B107.110 CAT 1 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5315-00-275-476426 INTERCHANGEABLE
Pin,straight,headless
Koehring Cranes, Inc Dba Terex Cranes Div Waverly Operations
3040-01-406-199717152 INTERCHANGEABLE
Bracket,eye,nonrotating Shaft
Coffin Turbo Pump Inc
1305-01-714-1432X126 INTERCHANGEABLE
Cartridge,12 Gage Shotgun
Olin Corp Div Olin Corporation
Cross-Reference Index
Part NumberManufacturer
X126 Stanley Industrial & Automotive Llc (USA)
H832-380-350 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
B107.110 CAT 1 TY1 General Services Administration Federal Supply Service (USA)
B107.1 TY1CL1 General Services Administration Federal Supply Service (USA)
752-7068431-350 Naval Sea Systems Command (USA)
5544A14 Mcmaster-Carr Supply Co (USA)
B107.1 The American Society of Mechanical Engineers (USA)
B107.110 The American Society of Mechanical Engineers (USA)
Related Parts
5315-00-275-4764INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
26
3040-01-406-1997INTERCHANGEABLE
BRACKET,EYE,NONROTATING SHAFT
17152
1305-01-714-1432INTERCHANGEABLE
CARTRIDGE,12 GAGE SHOTGUN
X126

Frequently Asked Questions

What is NSN 5120-01-366-8278?

NSN 5120-01-366-8278 is a Socket,socket Wrench, manufactured by Stanley Industrial & Automotive Llc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-366-8278?

NSN 5120-01-366-8278 has 8 cross-referenced part numbers: X126 (Stanley Industrial & Automotive Llc), H832-380-350 (Electric Boat Corporation Div General Dynamics Electric Boat), B107.110 CAT 1 TY1 (General Services Administration Federal Supply Service), B107.1 TY1CL1 (General Services Administration Federal Supply Service), 752-7068431-350 (Naval Sea Systems Command) and 3 more.

What NSN replaces 5120-01-366-8278?

There are 3 known substitutes for 5120-01-366-8278: 5315-00-275-4764, 3040-01-406-1997, 1305-01-714-1432. Verify interchangeability with system specifications before substitution.

What are the specifications of X126?

Key specifications for X126: Style Designator: INTERNAL-INTERNAL; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN; Features Provided: MANUAL TOOL; Surface Treatment: CHROMIUM OVERALL. 11 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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