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PartsTable / COMPONENT / NASM51959-50
NASM51959-50 ✓ 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: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.306 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN, thread_length: 1.150 INCHES NOMINAL IN, screw_material: STEEL CORROSION RESISTING, fastener_length: 1.250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-597-3577, 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
NASM51959-50
NSN: 5305-01-597-3577
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.306 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
thread_length1.150 INCHES NOMINAL IN
screw_materialSTEEL CORROSION RESISTING
fastener_length1.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleCROSS RECESS TYPE II
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-597-3577
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NASM51959-50 · 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 CLASS: 2A A
•
HEAD STYLE: FLAT COUNTERSUNK
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
SCREW MATERIAL: STEEL CORROSION RESISTING
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 32
•
THREAD DIRECTION: RIGHT-HAND
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
HEAD STYLEFLAT COUNTERSUNK
FASTENER LENGTH1.250 INCHES NOMINAL IN
SCREW MATERIALSTEEL CORROSION RESISTING
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH32
THREAD DIRECTIONRIGHT-HAND
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
HEAD DIAMETER0.306 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
THREAD LENGTH1.150 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
904386-20Interchangeable
interchangeable cross-reference
interchangeable
418331-15Interchangeable
interchangeable cross-reference
interchangeable
NAS M51959Interchangeable
interchangeable cross-reference
interchangeable
AN505C10R8Interchangeable
interchangeable cross-reference
interchangeable
AN505C10-8Interchangeable
interchangeable cross-reference
interchangeable
FF-S-92Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NASM51959-50?
NASM51959-50 is a SCREW,MACHINE.
What parts can replace NASM51959-50?
There are 13 known substitutes for NASM51959-50: 904386-20, 418331-15, NAS M51959 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NASM51959-50?
NASM51959-50 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-597-3577. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026