PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

11-128Socket,socket Wrench

Armstrong Bros Tool Co · NSN 5120-01-397-3289 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-397-3289 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-397-3289. Primary manufacturer part number: 11-128.
Features
  • Socket,socket Wrench — FSC 5120
  • Style Designator: INTERNAL-INTERNAL
  • Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS AND A STYLE
  • Specification/standard Data: 81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Surface Treatment: CHROMIUM OVERALL
  • Wrenching Surface Size: 0.875 INCHES NOMINAL SINGLE END IN
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-397-3289, 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 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-397-3289
Primary Part Number11-128
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerArmstrong Bros Tool Co
StatusACTIVE
Style DesignatorINTERNAL-INTERNAL
Nondefinitive Spec/std Data1 TYPE AND 1 CLASS AND A STYLE
Specification/standard Data81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Drive End ShapeSQUARE SINGLE END INTERNAL
Surface TreatmentCHROMIUM OVERALL
Wrenching Surface Size0.875 INCHES NOMINAL SINGLE END IN
Features ProvidedMANUAL TOOL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5945-00-072-008011-1-28 INTERCHANGEABLE
Relay,electrical
Te Connectivity Corporation
5331-00-265-1095MS29513-128 INTERCHANGEABLE
O-Ring
Sae International Dba Sae International
5120-00-278-106528820 INTERCHANGEABLE
Vise,bench and Pipe
Wilton Corp Wilton Tool Div
6150-00-549-67526476 INTERCHANGEABLE
Cable Assembly,power,electrical
Page Chester Ltd Dba Cooperative Industries Div Cooperative Industries Aerospace Defense
5360-00-905-182311128 INTERCHANGEABLE
Spring,helical,extension
Elbitamerica, Inc.
5950-01-008-293011128 INTERCHANGEABLE
Transformer,audio Frequency
Standex Electronics, Inc.
5310-01-123-052011128 INTERCHANGEABLE
Washer,flat
Sabre Engines Ltd
4320-01-200-4305C220 INTERCHANGEABLE
Ring,wearing
Circor Naval Solutions Llc Dba Warren Pumps
4730-01-214-145411128 INTERCHANGEABLE
Elbow,pipe to Tube
Westerbeke Corporation
3120-01-326-197211/128 INTERCHANGEABLE
Bushing,sleeve
Delphi Powertrain Systems, Llc
Cross-Reference Index
Part NumberManufacturer
11-128 Armstrong Bros Tool Co (USA)
11-128 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
456720013710 Ncb Hungary (honvedsegi Egyseges Termekkod) (HUN)
AS954 TY1CL1STA General Services Administration Federal Supply Service (USA)
11-128 Apex Tool Group, Llc Dba Nicholson (USA)
AS954 Society of Automotive Engineers Inc (USA)
AS954 Sae International Dba Sae International (USA)
Related Parts
5945-00-072-0080INTERCHANGEABLE
RELAY,ELECTRICAL
11-1-28
5331-00-265-1095INTERCHANGEABLE
O-RING
MS29513-128
5120-00-278-1065INTERCHANGEABLE
VISE,BENCH AND PIPE
28820
6150-00-549-6752INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL
6476
5360-00-905-1823INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
11128
5950-01-008-2930INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
11128
5310-01-123-0520INTERCHANGEABLE
WASHER,FLAT
11128
4320-01-200-4305INTERCHANGEABLE
RING,WEARING
C220
4730-01-214-1454INTERCHANGEABLE
ELBOW,PIPE TO TUBE
11128
3120-01-326-1972INTERCHANGEABLE
BUSHING,SLEEVE
11/128
5120-01-671-7373INTERCHANGEABLE
TROWEL
6515-01-686-4926INTERCHANGEABLE
AIRWAY,NASOPHARYNGEAL
11-128

Frequently Asked Questions

What is NSN 5120-01-397-3289?

NSN 5120-01-397-3289 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 5120-01-397-3289?

NSN 5120-01-397-3289 has 7 cross-referenced part numbers: 11-128 (Armstrong Bros Tool Co), 11-128 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.), 456720013710 (Ncb Hungary (honvedsegi Egyseges Termekkod)), AS954 TY1CL1STA (General Services Administration Federal Supply Service), 11-128 (Apex Tool Group, Llc Dba Nicholson) and 2 more.

What NSN replaces 5120-01-397-3289?

There are 12 known substitutes for 5120-01-397-3289: 5945-00-072-0080, 5331-00-265-1095, 5120-00-278-1065 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 11-128?

Key specifications for 11-128: Style Designator: INTERNAL-INTERNAL; Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS AND A STYLE; Specification/standard Data: 81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL. 11 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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