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PartsTable / COMPONENT / NASM21318-28
NASM21318-28 ✓ 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,DRIVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: ROUND, head_height: 0.091 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN, pilot_length: 0.047 INCHES NOMINAL IN, head_diameter: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, pilot_diameter: 0.112 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-253-5619, 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
NASM21318-28
NSN: 5305-00-253-5619
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleROUND
head_height0.091 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
pilot_length0.047 INCHES NOMINAL IN
head_diameter0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
pilot_diameter0.112 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
fastener_length0.312 INCHES NOMINAL IN
features_providedCASEHARDENED
surface_treatmentCADMIUM AND CHROMATE OVERALL
nonmachine_thread_styleDRIVE SCREW (TYPE U)
nonmachine_nominal_thread_diameter0.138 INCHES IN
surface_treatment_document_and_classificationQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NSN5305-00-253-5619
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NASM21318-28 · 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
•
HEAD DIAMETER: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
PILOT LENGTH: 0.047 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.091 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
•
HEAD STYLE: ROUND
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
PILOT DIAMETER: 0.112 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
FEATURES PROVIDED: CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
PILOT LENGTH0.047 INCHES NOMINAL IN
HEAD HEIGHT0.091 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
HEAD STYLEROUND
NONMACHINE NOMINAL THREAD DIAMETER0.138 INCHES IN
PILOT DIAMETER0.112 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
FEATURES PROVIDEDCASEHARDENED
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
6C605Interchangeable
interchangeable cross-reference
interchangeable
499295Interchangeable
interchangeable cross-reference
interchangeable
FFS107Interchangeable
interchangeable cross-reference
interchangeable
5305002535619Interchangeable
Same NIIN cross-reference
interchangeable
MS21318-28Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NASM21318-28?
NASM21318-28 is a SCREW,DRIVE.
What parts can replace NASM21318-28?
There are 5 known substitutes for NASM21318-28: 6C605, 499295, FFS107 and 2 more. Substitute compatibility should be verified for your specific system.
Is NASM21318-28 still available?
NASM21318-28 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