PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

59300Key,socket Head Screw

Armstrong Bros Tool Co · NSN 5120-01-578-7423 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-578-7423 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-578-7423. Primary manufacturer part number: 59300.
Features
  • Key,socket Head Screw — FSC 5120
  • Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Wrenching Surface Size: 0.050 INCHES NOMINAL BOTH ENDS IN
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • Style Designator: L-HANDLE
  • Surface Treatment: OXIDE OVERALL
  • Material: STEEL OVERALL
  • Features Provided: BALL END
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-578-7423, 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 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-578-7423
Primary Part Number59300
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerArmstrong Bros Tool Co
StatusACTIVE
Specification/standard Data05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Wrenching Surface Size0.050 INCHES NOMINAL BOTH ENDS IN
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
Style DesignatorL-HANDLE
Surface TreatmentOXIDE OVERALL
MaterialSTEEL OVERALL
Features ProvidedBALL END
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
6620-00-064-695054135 INTERCHANGEABLE
Gage,pressure,dial Indicating
Teleflex Inc Electrical Systems Div
5120-00-497-878159300 INTERCHANGEABLE
Crimping Tool,t Hea
Lockheed Martin Corp
5930-00-685-9521 INTERCHANGEABLE
Switch,toggle
1680-01-562-8573123SCAV9303-1 INTERCHANGEABLE
Rotory Coupler Assy
Fisica Applied Technologies, Inc. Div Randtron Antenna Systems
6515-01-685-908359-300 INTERCHANGEABLE
Grid,warming
Combat Medical Systems Llc
5975-01-733-076261681-1 INTERCHANGEABLE
Bushing,strain Relief,cable
Fisica Applied Technologies, Inc. Div Randtron Antenna Systems
5975-01-733-077261681-2 INTERCHANGEABLE
Bushing,strain Relief,cable
Fisica Applied Technologies, Inc. Div Randtron Antenna Systems
5340-01-733-207462520-2 INTERCHANGEABLE
Hanger,pipe
Fisica Applied Technologies, Inc. Div Randtron Antenna Systems
5340-01-733-236460843-2 INTERCHANGEABLE
Bracket,mounting
Fisica Applied Technologies, Inc. Div Randtron Antenna Systems
Cross-Reference Index
Part NumberManufacturer
59300 Armstrong Bros Tool Co (USA)
B18.3 The American Society of Mechanical Engineers (USA)
59300 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
59300 Apex Tool Group, Llc Dba Nicholson (USA)
Related Parts
6620-00-064-6950INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
54135
5120-00-497-8781INTERCHANGEABLE
CRIMPING TOOL,T HEA
59300
5930-00-685-9521INTERCHANGEABLE
SWITCH,TOGGLE
1680-01-562-8573INTERCHANGEABLE
ROTORY COUPLER ASSY
123SCAV9303-1
6515-01-685-9083INTERCHANGEABLE
GRID,WARMING
59-300
5975-01-733-0762INTERCHANGEABLE
BUSHING,STRAIN RELIEF,CABLE
61681-1
5975-01-733-0772INTERCHANGEABLE
BUSHING,STRAIN RELIEF,CABLE
61681-2
5340-01-733-2074INTERCHANGEABLE
HANGER,PIPE
62520-2
5340-01-733-2364INTERCHANGEABLE
BRACKET,MOUNTING
60843-2

Frequently Asked Questions

What is NSN 5120-01-578-7423?

NSN 5120-01-578-7423 is a Key,socket Head Screw, manufactured by Armstrong Bros Tool Co, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-578-7423?

NSN 5120-01-578-7423 has 4 cross-referenced part numbers: 59300 (Armstrong Bros Tool Co), B18.3 (The American Society of Mechanical Engineers), 59300 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.), 59300 (Apex Tool Group, Llc Dba Nicholson).

What NSN replaces 5120-01-578-7423?

There are 9 known substitutes for 5120-01-578-7423: 6620-00-064-6950, 5120-00-497-8781, 5930-00-685-9521 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 59300?

Key specifications for 59300: Overall Length: 6.000 INCHES NOMINAL IN; Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Wrenching Surface Size: 0.050 INCHES NOMINAL BOTH ENDS IN; Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL. 8 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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