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Technical Data Sheet
PartsTable / COMPONENT / 18-59-4-8
18-59-4-8 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FILLISTER, head_height: 0.079 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.183 INCHES NOMINAL IN, thread_length: 0.500 INCHES MAXIMUM IN, screw_material: PLASTIC POLYAMIDE NYLON. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-688-1903, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
18-59-4-8
NSN: 5305-00-688-1903
FSC: 5305
CAGE: 57472 — ALL MANUFACTURERS, INC. DBA ALLIED HARBOR AEROSPACE FASTENERS (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.079 INCHES NOMINAL IN
thread_class2A A
head_diameter0.183 INCHES NOMINAL IN
thread_length0.500 INCHES MAXIMUM IN
screw_materialPLASTIC POLYAMIDE NYLON
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter0.112 INCHES IN
thread_quantity_per_inch40
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-688-1903
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 18-59-4-8 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 40
•
INTERNAL DRIVE STYLE: SLOT
•
HEAD DIAMETER: 0.183 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.500 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD STYLE: FILLISTER
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A A
THREAD QUANTITY PER INCH40
INTERNAL DRIVE STYLESLOT
HEAD DIAMETER0.183 INCHES NOMINAL IN
FASTENER LENGTH0.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEFILLISTER
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONMIL-P-17901,TY 1 MIL SPEC SINGLE MATERIAL RESPONSE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
42366Interchangeable
interchangeable cross-reference
interchangeable
F910Interchangeable
interchangeable cross-reference
interchangeable
94289Interchangeable
interchangeable cross-reference
interchangeable
705-273111CInterchangeable
interchangeable cross-reference
interchangeable
030-0018Interchangeable
interchangeable cross-reference
interchangeable
44-012Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18-59-4-8?
18-59-4-8 is a SCREW,MACHINE.
What parts can replace 18-59-4-8?
There are 27 known substitutes for 18-59-4-8: 42366, F910, 94289 and 24 more. Substitute compatibility should be verified for your specific system.
Is 18-59-4-8 still available?
18-59-4-8 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026