PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FX12Extension,socket Wrench

Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc · NSN 5120-01-686-6951 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-686-6951 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-686-6951. Primary manufacturer part number: FX12.
Features
  • Extension,socket Wrench — FSC 5120
  • Features Provided: MANUAL TOOL
  • Style Designator: RIGID
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • 1 verified cross-reference
  • Primary manufacturer: Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
Applications
  • Field maintenance and repair
  • Facility maintenance operations
  • General-purpose hand tools
General Description

The Extension,socket Wrench, cataloged under National Stock Number 5120-01-686-6951, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc. Government technical data includes 3 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-686-6951
Primary Part NumberFX12
Item NameExtension,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerIdsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
StatusACTIVE
Features ProvidedMANUAL TOOL
Style DesignatorRIGID
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3455-00-540-2290TABLE 39, D3/8IN INTERCHANGEABLE
Cutter,milling,end
The American Society of Mechanical Engineers
4730-00-576-0280FX1/2 INTERCHANGEABLE
Union,pipe to Tube
Kenco Products Co Inc
Cross-Reference Index
Part NumberManufacturer
FX12 PRIMARY Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
Related Parts
3455-00-540-2290INTERCHANGEABLE
CUTTER,MILLING,END
TABLE 39, D3/8IN
4730-00-576-0280INTERCHANGEABLE
UNION,PIPE TO TUBE
FX1/2

Frequently Asked Questions

What is NSN 5120-01-686-6951?

NSN 5120-01-686-6951 is a Extension,socket Wrench, manufactured by Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-686-6951?

NSN 5120-01-686-6951 has 1 cross-referenced part number: FX12 (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc).

What NSN replaces 5120-01-686-6951?

There are 2 known substitutes for 5120-01-686-6951: 3455-00-540-2290, 4730-00-576-0280. Verify interchangeability with system specifications before substitution.

What are the specifications of FX12?

Key specifications for FX12: Overall Length: 12.0 INCHES NOMINAL IN; Features Provided: MANUAL TOOL; Style Designator: RIGID; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN. 5 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