PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

J5421MHSocket,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-627-1981 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-627-1981 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-627-1981. Primary manufacturer part number: J5421MH.
Features
  • Socket,socket Wrench — FSC 5120
  • Wrenching Surface Shape: 6 POINT SINGLE END INTERNAL
  • Features Provided: MANUAL TOOL
  • Style Designator: INTERNAL-INTERNAL
  • Material: STEEL OVERALL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Surface Treatment: CHROMIUM OVERALL
  • Drive Surface Size: 0.500 INCHES NOMINAL SINGLE END IN
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-627-1981, 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 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-627-1981
Primary Part NumberJ5421MH
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusACTIVE
Wrenching Surface Shape6 POINT SINGLE END INTERNAL
Features ProvidedMANUAL TOOL
Style DesignatorINTERNAL-INTERNAL
MaterialSTEEL OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Surface TreatmentCHROMIUM OVERALL
Drive Surface Size0.500 INCHES NOMINAL SINGLE END IN
Wrenching Surface Size21.0 MILLIMETERS NOMINAL SINGLE END MM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5120-01-348-904032521 INTERCHANGEABLE
Socket,socket Wrench
Williams J H Industrial Products Inc
Cross-Reference Index
Part NumberManufacturer
J5421MH The Stanley Works Dba Stanley Proto (USA)
Related Parts
5120-01-348-9040INTERCHANGEABLE
SOCKET,SOCKET WRENCH
32521

Frequently Asked Questions

What is NSN 5120-01-627-1981?

NSN 5120-01-627-1981 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 5120-01-627-1981?

NSN 5120-01-627-1981 has 1 cross-referenced part number: J5421MH (The Stanley Works Dba Stanley Proto).

What NSN replaces 5120-01-627-1981?

There is 1 known substitute for 5120-01-627-1981: 5120-01-348-9040. Verify interchangeability with system specifications before substitution.

What are the specifications of J5421MH?

Key specifications for J5421MH: Overall Length: 1.500 INCHES NOMINAL IN; Wrenching Surface Shape: 6 POINT SINGLE END INTERNAL; Features Provided: MANUAL TOOL; Style Designator: INTERNAL-INTERNAL. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com