PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

38-120Socket,socket Wrench

Armstrong Bros Tool Co · NSN 5120-01-581-4154 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-581-4154 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-581-4154. Primary manufacturer part number: 38-120.
Features
  • Socket,socket Wrench — FSC 5120
  • Wrenching End Opening Depth: 16.8 MILLIMETERS NOMINAL MM
  • Drive End Outside Diameter: 27.4 MILLIMETERS NOMINAL MM
  • Wrenching End Outside Diameter: 27.4 MILLIMETERS NOMINAL MM
  • Style Designator: INTERNAL-INTERNAL
  • Features Provided: MANUAL TOOL
  • Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL
  • Wrenching Surface Size: 20.0 MILLIMETERS NOMINAL SINGLE END MM
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-581-4154, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Armstrong Bros Tool Co. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-581-4154
Primary Part Number38-120
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerArmstrong Bros Tool Co
StatusACTIVE
Wrenching End Opening Depth16.8 MILLIMETERS NOMINAL MM
Drive End Outside Diameter27.4 MILLIMETERS NOMINAL MM
Wrenching End Outside Diameter27.4 MILLIMETERS NOMINAL MM
Style DesignatorINTERNAL-INTERNAL
Features ProvidedMANUAL TOOL
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Wrenching Surface Size20.0 MILLIMETERS NOMINAL SINGLE END MM
Surface TreatmentCHROMIUM OVERALL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5950-00-061-447761A12D26 INTERCHANGEABLE
Transformer,power
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
3110-00-117-0779 INTERCHANGEABLE
Bearing,roller,thrust
4730-00-627-3429520-13550-1 INTERCHANGEABLE
Coupling,tolerance
The Boeing Company Div Legacy Wichita
5330-00-907-597238120 INTERCHANGEABLE
Packing,preformed
Mitsubishi Caterpillar Forklift America, Inc
5985-01-070-7450381-20 INTERCHANGEABLE
Attenuator,fixed
Cinch Connectivity Solutions Inc
5975-01-365-520938120 INTERCHANGEABLE
Chassis,electrical-Electronic Eq
Motorola/codex Corp Sub of Motorola Inc
4720-01-386-1813GH793-20 INTERCHANGEABLE
Hose,nonmetallic
Danfoss Power Solutions II, Llc
1560-01-724-760338120 INTERCHANGEABLE
Support,structural Component,air
Avtechtyee Inc Dba Avtech
Cross-Reference Index
Part NumberManufacturer
38-120 Armstrong Bros Tool Co (USA)
38-120 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
38-120 Apex Tool Group, Llc Dba Nicholson (USA)
Related Parts
5950-00-061-4477INTERCHANGEABLE
TRANSFORMER,POWER
61A12D26
3110-00-117-0779INTERCHANGEABLE
BEARING,ROLLER,THRUST
4730-00-627-3429INTERCHANGEABLE
COUPLING,TOLERANCE
520-13550-1
5330-00-907-5972INTERCHANGEABLE
PACKING,PREFORMED
38120
5985-01-070-7450INTERCHANGEABLE
ATTENUATOR,FIXED
381-20
5975-01-365-5209INTERCHANGEABLE
CHASSIS,ELECTRICAL-ELECTRONIC EQ
38120
4720-01-386-1813INTERCHANGEABLE
HOSE,NONMETALLIC
GH793-20
1560-01-724-7603INTERCHANGEABLE
SUPPORT,STRUCTURAL COMPONENT,AIR
38120

Frequently Asked Questions

What is NSN 5120-01-581-4154?

NSN 5120-01-581-4154 is a Socket,socket Wrench, manufactured by Armstrong Bros Tool Co, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-581-4154?

NSN 5120-01-581-4154 has 3 cross-referenced part numbers: 38-120 (Armstrong Bros Tool Co), 38-120 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.), 38-120 (Apex Tool Group, Llc Dba Nicholson).

What NSN replaces 5120-01-581-4154?

There are 8 known substitutes for 5120-01-581-4154: 5950-00-061-4477, 3110-00-117-0779, 4730-00-627-3429 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 38-120?

Key specifications for 38-120: Wrenching End Opening Depth: 16.8 MILLIMETERS NOMINAL MM; Drive End Outside Diameter: 27.4 MILLIMETERS NOMINAL MM; Wrenching End Outside Diameter: 27.4 MILLIMETERS NOMINAL MM; Style Designator: INTERNAL-INTERNAL. 12 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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