PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23820Screw,cap,socket Head

Fastenal Company Dba Fastenal Co · NSN 5305-01-564-3121 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-01-564-3121 — this item is cataloged by the U.S. Government under National Stock Number 5305-01-564-3121. Primary manufacturer part number: 23820.
Features
  • Screw,cap,socket Head — FSC 5305
  • Thread Direction: RIGHT-HAND
  • Fastener Length: 1.000 INCHES NOMINAL IN
  • Nominal Thread Diameter: 0.312 INCHES IN
  • Head Diameter: 0.409 INCHES MINIMUM AND 0.457 INCHES MAXIMUM IN
  • Thread Class: 3A A
  • Material: STEEL OVERALL
  • Surface Treatment: OXIDE OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-564-3121, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, 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
NSN5305-01-564-3121
Primary Part Number23820
Item NameScrew,cap,socket Head
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerFastenal Company Dba Fastenal Co
StatusACTIVE
Thread DirectionRIGHT-HAND
Fastener Length1.000 INCHES NOMINAL IN
Nominal Thread Diameter0.312 INCHES IN
Head Diameter0.409 INCHES MINIMUM AND 0.457 INCHES MAXIMUM IN
Thread Class3A A
MaterialSTEEL OVERALL
Surface TreatmentOXIDE OVERALL
ColorBLACK OVERALL
Thread Series DesignatorUNF
Head StyleFLAT CHAMFER
Thread Length0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
Width Across Flats0.250 INCHES NOMINAL IN
Head Height0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
Internal Drive StyleHEXAGON
Thread Quantity Per Inch24
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-035-792523-820 INTERCHANGEABLE
Contact,electrical
Eaton Corp Opns & Technical Center
5940-00-150-42392382-0 INTERCHANGEABLE
Post,binding,electrical
Fluke Electronics Corp
5955-00-179-8114 INTERCHANGEABLE
Oscillator,noncrystal Controlled
5330-00-306-199523820 INTERCHANGEABLE
Seal,plain Encased
Skf Usa Inc. Dba Skf Aerospace Sealing Solutions
5930-00-386-852023820 INTERCHANGEABLE
Switch Section,rotary
Cts Corp Electromechanical Div
3040-01-230-898823820 INTERCHANGEABLE
Shaft,shouldered
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
2910-01-290-4373 INTERCHANGEABLE
Filter Element,fluid
1630-01-338-712423820 INTERCHANGEABLE
Rotor,disc Brake
Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco
4220-01-345-782423820 INTERCHANGEABLE
Diffuser,air Supply
Air-Lock, Incorporated
4730-01-482-146328320.1 INTERCHANGEABLE
Strainer,sediment
Bunn-O-Matic Corporation Div Government Sales
Cross-Reference Index
Part NumberManufacturer
23820 PRIMARY Fastenal Company Dba Fastenal Co (USA)
Related Parts
5999-00-035-7925INTERCHANGEABLE
CONTACT,ELECTRICAL
23-820
5940-00-150-4239INTERCHANGEABLE
POST,BINDING,ELECTRICAL
2382-0
5955-00-179-8114INTERCHANGEABLE
OSCILLATOR,NONCRYSTAL CONTROLLED
5330-00-306-1995INTERCHANGEABLE
SEAL,PLAIN ENCASED
23820
5930-00-386-8520INTERCHANGEABLE
SWITCH SECTION,ROTARY
23820
3040-01-230-8988INTERCHANGEABLE
SHAFT,SHOULDERED
23820
2910-01-290-4373INTERCHANGEABLE
FILTER ELEMENT,FLUID
1630-01-338-7124INTERCHANGEABLE
ROTOR,DISC BRAKE
23820
4220-01-345-7824INTERCHANGEABLE
DIFFUSER,AIR SUPPLY
23820
4730-01-482-1463INTERCHANGEABLE
STRAINER,SEDIMENT
28320.1
6810-01-587-4057INTERCHANGEABLE
COBALT CARBOXYLATE
23820
6515-01-590-4974INTERCHANGEABLE
HEAD,OTOSCOPE OPERATING
23820

Frequently Asked Questions

What is NSN 5305-01-564-3121?

NSN 5305-01-564-3121 is a Screw,cap,socket Head, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5305 (No Item Name Available). Status: active.

What are the part numbers for NSN 5305-01-564-3121?

NSN 5305-01-564-3121 has 1 cross-referenced part number: 23820 (Fastenal Company Dba Fastenal Co).

What NSN replaces 5305-01-564-3121?

There are 12 known substitutes for 5305-01-564-3121: 5999-00-035-7925, 5940-00-150-4239, 5955-00-179-8114 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 23820?

Key specifications for 23820: Thread Direction: RIGHT-HAND; Fastener Length: 1.000 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Head Diameter: 0.409 INCHES MINIMUM AND 0.457 INCHES MAXIMUM IN. 17 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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