Crowfoot Attachment, Socket Wrenc5120-00-166-0171

NSN 5120-00-166-0171 · NIIN 001660171

FSC 5120 — Hand Tools, Nonedged, Nonpowered · FSG 51 — Hand Tools

Government record, cited

Also searched as 5120-00-166-0171 · 5120001660171 · NIIN 001660171 · 00-166-0171 · FSC 5120 Hand Tools, Nonedged, Nonpowered · 14-76053-1 · 14-76053-1

Nearby stock numbers ← 5120-00-166-0104 Contact Positioner, Terminal Crimping Tool · 5120-00-166-0351 Riveter, Counterweight, Turbine BL →

Features

Crowfoot Attachment,socket Wrenc — FSC 5120
Drive Surface Size: 0.380 INCHES NOMINAL SINGLE END IN
Reference Data and Literature: TO 4A4-20-4
Drive End Shape: SQUARE SINGLE END INTERNAL
Material: STEEL OVERALL

Identification

NSN: 5120-00-166-0171
NIIN: 001660171
FSC: 5120 — Hand Tools, Nonedged, Nonpowered
FSG: 51 — Hand Tools

General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-00-166-0171, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5120-00-166-0171
Item Name	Crowfoot Attachment,socket Wrenc
FSC / FSG	5120 / 51 — Hand Tools, Nonedged, Nonpowered
Status	ACTIVE
Drive Surface Size	0.380 INCHES NOMINAL SINGLE END IN
Reference Data and Literature	TO 4A4-20-4
Drive End Shape	SQUARE SINGLE END INTERNAL
Material	STEEL OVERALL

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
14-76053-1	3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems
14-76053-1	C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector

No interchangeability data on file.

Other items in FSC 5120 — Hand Tools, Nonedged, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5120-00-001-2642

ADAPTER,TORQUE WRENCH

5120-00-001-2644

ADAPTER,TORQUE WRENCH

5120-00-001-2650

INSERTER,SEAL

5120-00-001-2651

5120-00-001-2651 · Item name not on file

5120-00-001-2652

INSTALLING TOOL,SHAFT

5120-00-001-2653

REMOVER,PREFORMED PACKING

5120-00-001-2654

REMOVER,PREFORMED PACKING

5120-00-001-2655

SOCKET,WRENCH,FACE SPANNER

Frequently Asked Questions

What is NSN 5120-00-166-0171?

NSN 5120-00-166-0171 is a Crowfoot Attachment,socket Wrenc, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.

What are the specifications of 5120-00-166-0171?

Key specifications for 5120-00-166-0171: Drive Surface Size: 0.380 INCHES NOMINAL SINGLE END IN; Reference Data and Literature: TO 4A4-20-4; Overall Width: 3.000 INCHES NOMINAL IN; Drive End Shape: SQUARE SINGLE END INTERNAL. 4 specifications are documented in the U.S. Government catalog.

Is NSN 5120-00-166-0171 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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