PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5208BSocket,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9545 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9545 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9545. Primary manufacturer part number: 5208B.
Features
  • Socket,socket Wrench — FSC 5120
  • Material: STEEL OVERALL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Size: 0.250 INCHES NOMINAL SINGLE END IN
  • Nondefinitive Spec/std Data: 1 TYPE AND 3 CLASS
  • Style Designator: INTERNAL-INTERNAL
  • Features Provided: MANUAL TOOL
  • Surface Treatment: OXIDE OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-399-9545, 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 10 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. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-399-9545
Primary Part Number5208B
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusACTIVE
MaterialSTEEL OVERALL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Wrenching Surface Size0.250 INCHES NOMINAL SINGLE END IN
Nondefinitive Spec/std Data1 TYPE AND 3 CLASS
Style DesignatorINTERNAL-INTERNAL
Features ProvidedMANUAL TOOL
Surface TreatmentOXIDE OVERALL
Specification/standard Data05047-ASME B107.1 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Drive End ShapeSQUARE SINGLE END INTERNAL
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
6760-00-244-2262 INTERCHANGEABLE
Fastener Assembly,camera
5120-01-366-8357 INTERCHANGEABLE
Socket,socket Wrench
5120-01-398-778800943003000 INTERCHANGEABLE
Socket,socket Wrench
Sears, Roebuck and Co. Dba Sears Div Sears Commercial
5120-01-429-3532 INTERCHANGEABLE
Socket Set,socket Wrench
5120-01-429-3589 INTERCHANGEABLE
Socket Set,socket Wrench
5120-01-641-1064 INTERCHANGEABLE
Socket,socket Wrench
Cross-Reference Index
Part NumberManufacturer
5208B The Stanley Works Dba Stanley Proto (USA)
B107.1 The American Society of Mechanical Engineers (USA)
J5208B The Stanley Works Dba Stanley Proto (USA)
1AK18 W.w. Grainger, Inc. Div Government Sales Division (USA)
B107.1 TY1CL3 General Services Administration Federal Supply Service (USA)
Related Parts
6760-00-244-2262INTERCHANGEABLE
FASTENER ASSEMBLY,CAMERA
5120-01-366-8357INTERCHANGEABLE
SOCKET,SOCKET WRENCH
5120-01-398-7788INTERCHANGEABLE
SOCKET,SOCKET WRENCH
00943003000
5120-01-429-3532INTERCHANGEABLE
SOCKET SET,SOCKET WRENCH
5120-01-429-3589INTERCHANGEABLE
SOCKET SET,SOCKET WRENCH
5120-01-641-1064INTERCHANGEABLE
SOCKET,SOCKET WRENCH

Frequently Asked Questions

What is NSN 5120-01-399-9545?

NSN 5120-01-399-9545 is a Socket,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 5120-01-399-9545?

NSN 5120-01-399-9545 has 5 cross-referenced part numbers: 5208B (The Stanley Works Dba Stanley Proto), B107.1 (The American Society of Mechanical Engineers), J5208B (The Stanley Works Dba Stanley Proto), 1AK18 (W.w. Grainger, Inc. Div Government Sales Division), B107.1 TY1CL3 (General Services Administration Federal Supply Service).

What NSN replaces 5120-01-399-9545?

There are 6 known substitutes for 5120-01-399-9545: 6760-00-244-2262, 5120-01-366-8357, 5120-01-398-7788 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5208B?

Key specifications for 5208B: Material: STEEL OVERALL; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN; Wrenching Surface Size: 0.250 INCHES NOMINAL SINGLE END IN; Nondefinitive Spec/std Data: 1 TYPE AND 3 CLASS. 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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