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M-4-18-20 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

M-4-18-20: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include thread_class: 2A A, thread_length: 0.250 INCHES NOMINAL IN, screw_material: STEEL, thread_direction: RIGHT-HAND, nominal_thread_diameter: 0.138 INCHES IN, thread_quantity_per_inch: 32. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-459-4739, 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
M-4-18-20
NSN: 5305-01-459-4739
FSC: 5305 — Screws
CAGE: 07309 — BIRD-JOHNSON PROPELLER COMPANY, LLC (USA)
SPECIFICATIONS
thread_class2A A
thread_length0.250 INCHES NOMINAL IN
screw_materialSTEEL
thread_directionRIGHT-HAND
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-459-4739
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: M-4-18-20 · 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 LENGTH: 0.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS
THREAD LENGTH0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL
THREAD CLASS2A A
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SUBSTITUTES & CROSS-REFERENCES 1
M-5-2-7Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M-4-18-20?
M-4-18-20 is a SCREW,MACHINE.
What parts can replace M-4-18-20?
There is 1 known substitute for M-4-18-20: M-5-2-7. Substitute compatibility should be verified for your specific system.
What is the NSN for M-4-18-20?
M-4-18-20 is cataloged in the U.S. Government catalog under NSN 5305-01-459-4739. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.