PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FFB584Bolt,square Neck

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 5306-00-012-6638 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-012-6638 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-012-6638. Primary manufacturer part number: FFB584.
Features
  • Bolt,square Neck — FSC 5306
  • Nominal Thread Diameter: 0.250 INCHES IN
  • Neck Length: 0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC)
  • Surface Treatment: CADMIUM OR ZINC OVERALL
  • Thread Quantity Per Inch: 20
  • Fastener Length: 4.000 INCHES NOMINAL IN
  • Thread Class: 2A A
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Bolt,square Neck, cataloged under National Stock Number 5306-00-012-6638, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 14 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
NSN5306-00-012-6638
Primary Part NumberFFB584
Item NameBolt,square Neck
FSC / FSG5306 / 53 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusACTIVE
Nominal Thread Diameter0.250 INCHES IN
Neck Length0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Surface TreatmentCADMIUM OR ZINC OVERALL
Thread Quantity Per Inch20
Fastener Length4.000 INCHES NOMINAL IN
Thread Class2A A
Thread Length0.750 INCHES MINIMUM IN
Head StyleBUTTON
Thread DirectionRIGHT-HAND
Nondefinitive Spec/std DataI TYPE AND 1 CLASS AND A STYLE
Head Diameter0.563 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN
Head Height0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
Neck Width0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5306-00-010-9115MS35751-72 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Bolt,square Neck
Bolt,square Neck
5306-00-027-0722MS35751-19 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-053-8381MS35751-40 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-054-8004548004 SUCCESSOR
Bolt,square Neck
U S Army Tank Automotive Command Amsta-Im-Mm
Bolt,square Neck
5306-00-067-8511MS35751-83 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-089-1424MS35751-136 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-089-1427MS35751-145 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Cross-Reference Index
Part NumberManufacturer
FFB584 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5306-00-010-9115SUCCESSOR
BOLT,SQUARE NECK
MS35751-72
5306-00-012-0955SUCCESSOR
BOLT,SQUARE NECK
5306-00-012-6227SUCCESSOR
BOLT,SQUARE NECK
5306-00-027-0722SUCCESSOR
BOLT,SQUARE NECK
MS35751-19
5306-00-053-8381SUCCESSOR
BOLT,SQUARE NECK
MS35751-40
5306-00-054-8004SUCCESSOR
BOLT,SQUARE NECK
548004
5306-00-054-8052SUCCESSOR
BOLT,SQUARE NECK
5306-00-067-8511SUCCESSOR
BOLT,SQUARE NECK
MS35751-83
5306-00-089-1424SUCCESSOR
BOLT,SQUARE NECK
MS35751-136
5306-00-089-1427SUCCESSOR
BOLT,SQUARE NECK
MS35751-145
5306-00-089-1531SUCCESSOR
BOLT,SQUARE NECK
MS35751-140
5306-00-248-8700SUCCESSOR
BOLT,SQUARE NECK

Frequently Asked Questions

What is NSN 5306-00-012-6638?

NSN 5306-00-012-6638 is a Bolt,square Neck, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 5306 (No Item Name Available). Status: active.

What are the part numbers for NSN 5306-00-012-6638?

NSN 5306-00-012-6638 has 1 cross-referenced part number: FFB584 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 5306-00-012-6638?

There are 12 known substitutes for 5306-00-012-6638: 5306-00-010-9115, 5306-00-012-0955, 5306-00-012-6227 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FFB584?

Key specifications for FFB584: Nominal Thread Diameter: 0.250 INCHES IN; Neck Length: 0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Surface Treatment: CADMIUM OR ZINC OVERALL. 14 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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