PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

50559Screw,cap,socket Head

Caterpillar Work Tools, Inc Dba Caterpillar · NSN 5305-01-240-0857 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-01-240-0857 — this item is cataloged by the U.S. Government under National Stock Number 5305-01-240-0857. Primary manufacturer part number: 50559.
Features
  • Screw,cap,socket Head — FSC 5305
  • Nominal Thread Diameter: 0.250 INCHES IN
  • Thread Quantity Per Inch: 20
  • Fastener Length: 1.750 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Caterpillar Work Tools, Inc Dba Caterpillar
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-240-0857, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Caterpillar Work Tools, Inc Dba Caterpillar. Government technical data includes 3 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5305-01-240-0857
Primary Part Number50559
Item NameScrew,cap,socket Head
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerCaterpillar Work Tools, Inc Dba Caterpillar
StatusACTIVE
Nominal Thread Diameter0.250 INCHES IN
Thread Quantity Per Inch20
Fastener Length1.750 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
5330-00-214-644650559 INTERCHANGEABLE
Gasket
Hamilton Sundstrand Corporation Dba Collins Aerospace
5310-00-221-4915SCB70002 INTERCHANGEABLE
Nut,plain,hexagon
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
3455-00-222-4063 INTERCHANGEABLE
File,rotary
5120-00-240-7308129 INTERCHANGEABLE
Block,bench,mechanic's
L.s. Starrett Company (the) Div Tool Division
5355-00-687-293150559 INTERCHANGEABLE
Dial,control
Paramount Panels, Inc. Div California Plasteck
3010-00-919-5233 INTERCHANGEABLE
Coupling,shaft,flexible
5998-01-060-639350559 INTERCHANGEABLE
Circuit Card Assembly
Alliant Techsystems Operations Llc Div Defense Electronic Systems
5999-01-089-1799 INTERCHANGEABLE
Delay Line
3460-01-138-3486 INTERCHANGEABLE
Deflector
5950-01-139-6040374264 INTERCHANGEABLE
Transformer,power
Fluke Corp
Cross-Reference Index
Part NumberManufacturer
50559 Caterpillar Work Tools, Inc Dba Caterpillar (USA)
Related Parts
5330-00-214-6446INTERCHANGEABLE
GASKET
50559
5310-00-221-4915INTERCHANGEABLE
NUT,PLAIN,HEXAGON
SCB70002
3455-00-222-4063INTERCHANGEABLE
FILE,ROTARY
5120-00-240-7308INTERCHANGEABLE
BLOCK,BENCH,MECHANIC'S
129
5355-00-687-2931INTERCHANGEABLE
DIAL,CONTROL
50559
3010-00-919-5233INTERCHANGEABLE
COUPLING,SHAFT,FLEXIBLE
5998-01-060-6393INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
50559
5999-01-089-1799INTERCHANGEABLE
DELAY LINE
3460-01-138-3486INTERCHANGEABLE
DEFLECTOR
5950-01-139-6040INTERCHANGEABLE
TRANSFORMER,POWER
374264
4720-01-337-3953INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
50559-25

Frequently Asked Questions

What is NSN 5305-01-240-0857?

NSN 5305-01-240-0857 is a Screw,cap,socket Head, manufactured by Caterpillar Work Tools, Inc Dba Caterpillar, classified under FSC 5305 (No Item Name Available). Status: active.

What are the part numbers for NSN 5305-01-240-0857?

NSN 5305-01-240-0857 has 1 cross-referenced part number: 50559 (Caterpillar Work Tools, Inc Dba Caterpillar).

What NSN replaces 5305-01-240-0857?

There are 11 known substitutes for 5305-01-240-0857: 5330-00-214-6446, 5310-00-221-4915, 3455-00-222-4063 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 50559?

Key specifications for 50559: Nominal Thread Diameter: 0.250 INCHES IN; Thread Quantity Per Inch: 20; Fastener Length: 1.750 INCHES NOMINAL IN. 3 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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