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Technical Data Sheet
PartsTable / COMPONENT / NAS221-9
NAS221-9 ✓ 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: ROUND, head_height: 0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.361 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, thread_length: 0.377 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN, screw_material: STEEL COMP 8630. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-282-4208, 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
NAS221-9
NSN: 5305-00-282-4208
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
head_styleROUND
head_height0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.361 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_length0.377 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
screw_materialSTEEL COMP 8630
fastener_length0.579 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentCADMIUM
NSN5305-00-282-4208
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NAS221-9 · 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
•
SCREW MATERIAL: STEEL COMP 8630
•
SCREW SURFACE TREATMENT: CADMIUM
•
HEAD STYLE: ROUND
•
THREAD LENGTH: 0.377 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD DIAMETER: 0.361 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6050 MIL SPEC SINGLE MATERIAL RESPONSE OR AN-S-9 MIL STD SINGLE MATERIAL RESPONSE
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
SCREW MATERIALSTEEL COMP 8630
SCREW SURFACE TREATMENTCADMIUM
HEAD STYLEROUND
THREAD LENGTH0.377 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
HEAD DIAMETER0.361 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6050 MIL SPEC SINGLE MATERIAL RESPONSE OR AN-S-9 MIL STD SINGLE MATERIAL RESPONSE
THREAD SERIES DESIGNATORUNF
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
S195-500Interchangeable
interchangeable cross-reference
interchangeable
O-C-265Interchangeable
interchangeable cross-reference
interchangeable
2219Interchangeable
interchangeable cross-reference
interchangeable
8034658-16Interchangeable
interchangeable cross-reference
interchangeable
85T4-5Interchangeable
interchangeable cross-reference
interchangeable
42-6921Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS221-9?
NAS221-9 is a SCREW,MACHINE.
What parts can replace NAS221-9?
There are 17 known substitutes for NAS221-9: S195-500, O-C-265, 2219 and 14 more. Substitute compatibility should be verified for your specific system.
Is NAS221-9 still available?
NAS221-9 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