PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S221Socket,socket Wrench

Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc · NSN 5120-01-661-7184 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-661-7184 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-661-7184. Primary manufacturer part number: S221.
Features
  • Socket,socket Wrench — FSC 5120
  • Surface Treatment: CHROMIUM OVERALL
  • Features Provided: MANUAL TOOL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Style Designator: INTERNAL-INTERNAL
  • Wrenching Surface Size: 0.688 INCHES NOMINAL SINGLE END IN
  • Material: STEEL 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 5120-01-661-7184, 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 8 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-661-7184
Primary Part NumberS221
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerIdsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
StatusACTIVE
Surface TreatmentCHROMIUM OVERALL
Features ProvidedMANUAL TOOL
Drive End ShapeSQUARE SINGLE END INTERNAL
Style DesignatorINTERNAL-INTERNAL
Wrenching Surface Size0.688 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Drive Surface Size0.500 INCHES NOMINAL SINGLE END IN
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5120-00-042-7848S22-1 INTERCHANGEABLE
Die,crimping Tool
Souriau Usa, Inc. Dba Souriau Usa Inc
4720-00-059-5819S50HL1-4X3-8X50 INTERCHANGEABLE
Tubing,nonmetallic
Saint-Gobain Performance Plastics
9540-00-147-7721 INTERCHANGEABLE
Channel,structural
4720-00-555-2896R210-1 1/2X5/8 9FT INTERCHANGEABLE
Tubing,nonmetallic
Mayon Plastics Inc
6625-00-765-5690 INTERCHANGEABLE
Network,test Set
5930-00-823-7305101904MY INTERCHANGEABLE
Switch,rotary
Electro Switch Corp. Dba Electro Switch Corp
4820-01-143-4307 INTERCHANGEABLE
Valve,gate
5310-01-229-7791S-221 INTERCHANGEABLE
Nut
Cummins Inc.
5120-01-616-2598S221 INTERCHANGEABLE
Pliers
Swanstrom Corp Swanstrom Tools Usa Div
6635-01-678-5945S221 INTERCHANGEABLE
Test Set,automatic Smoke Alarm
Regin Hvac Products, Inc.
Cross-Reference Index
Part NumberManufacturer
S221 PRIMARY Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
11A7000789-6 Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army (USA)
Related Parts
5120-00-042-7848INTERCHANGEABLE
DIE,CRIMPING TOOL
S22-1
4720-00-059-5819INTERCHANGEABLE
TUBING,NONMETALLIC
S50HL1-4X3-8X50
9540-00-147-7721INTERCHANGEABLE
CHANNEL,STRUCTURAL
4720-00-555-2896INTERCHANGEABLE
TUBING,NONMETALLIC
R210-1 1/2X5/8 9FT
6625-00-765-5690INTERCHANGEABLE
NETWORK,TEST SET
5930-00-823-7305INTERCHANGEABLE
SWITCH,ROTARY
101904MY
4820-01-143-4307INTERCHANGEABLE
VALVE,GATE
5310-01-229-7791INTERCHANGEABLE
NUT
S-221
5120-01-616-2598INTERCHANGEABLE
PLIERS
S221
6635-01-678-5945INTERCHANGEABLE
TEST SET,AUTOMATIC SMOKE ALARM
S221

Frequently Asked Questions

What is NSN 5120-01-661-7184?

NSN 5120-01-661-7184 is a Socket,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 5120-01-661-7184?

NSN 5120-01-661-7184 has 2 cross-referenced part numbers: S221 (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), 11A7000789-6 (Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army).

What NSN replaces 5120-01-661-7184?

There are 10 known substitutes for 5120-01-661-7184: 5120-00-042-7848, 4720-00-059-5819, 9540-00-147-7721 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S221?

Key specifications for S221: Surface Treatment: CHROMIUM OVERALL; End Item Identification: ARSS; Overall Length: 3.250 INCHES NOMINAL IN; Features Provided: MANUAL TOOL. 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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