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PartsTable / COMPONENT / NAS1635-4-18
NAS1635-4-18 ✓ 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: PAN, head_height: 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN, thread_length: 0.994 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN, screw_material: STEEL CORROSION RESISTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-211-1449, 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
NAS1635-4-18
NSN: 5305-01-211-1449
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
head_stylePAN
head_height0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
thread_length0.994 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
screw_materialSTEEL CORROSION RESISTING
fastener_length1.065 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.250 INCHES IN
screw_surface_treatmentPASSIVATE
thread_quantity_per_inch28
NSN5305-01-211-1449
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NAS1635-4-18 · 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 QUANTITY PER INCH: 28
•
THREAD CLASS: 2A A
•
SCREW MATERIAL: STEEL CORROSION RESISTING
•
THREAD SERIES DESIGNATOR: UNF
•
SPECIFICATION/STANDARD DATA: 80205-NAS1635 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
HEAD HEIGHT: 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD DIAMETER: 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH28
THREAD CLASS2A A
SCREW MATERIALSTEEL CORROSION RESISTING
THREAD SERIES DESIGNATORUNF
SPECIFICATION/STANDARD DATA80205-NAS1635 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
HEAD HEIGHT0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
HEAD DIAMETER0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
HEAD STYLEPAN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
951-201Interchangeable
interchangeable cross-reference
interchangeable
951Interchangeable
interchangeable cross-reference
interchangeable
9999-4000-001Interchangeable
interchangeable cross-reference
interchangeable
1480087-1Interchangeable
interchangeable cross-reference
interchangeable
TDX GENTAMICIN CALIBRATORSInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS1635-4-18?
NAS1635-4-18 is a SCREW,MACHINE.
What parts can replace NAS1635-4-18?
There are 5 known substitutes for NAS1635-4-18: 951-201, 951, 9999-4000-001 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS1635-4-18?
NAS1635-4-18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-211-1449. 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