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Technical Data Sheet
PartsTable / COMPONENT / MS21318-53
MS21318-53 ✓ 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: 0.139 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN, pilot_length: 0.078 INCHES NOMINAL IN, head_diameter: 0.382 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN, pilot_diameter: 0.173 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-253-5630, 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
MS21318-53
NSN: 5305-00-253-5630
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_height0.139 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
pilot_length0.078 INCHES NOMINAL IN
head_diameter0.382 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN
pilot_diameter0.173 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
fastener_length0.750 INCHES NOMINAL IN
features_providedCASEHARDENED
surface_treatmentCADMIUM AND CHROMATE OVERALL
nonmachine_thread_styleDRIVE SCREW (TYPE U)
nonmachine_nominal_thread_diameter0.209 INCHES IN
surface_treatment_document_and_classificationQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NSN5305-00-253-5630
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS21318-53 · 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
•
PILOT DIAMETER: 0.173 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
•
NONMACHINE THREAD STYLE: DRIVE SCREW (TYPE U)
•
MATERIAL: STEEL OVERALL
•
HEAD DIAMETER: 0.382 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
FEATURES PROVIDED: CASEHARDENED
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.209 INCHES IN
•
HEAD HEIGHT: 0.139 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
PILOT DIAMETER0.173 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
NONMACHINE THREAD STYLEDRIVE SCREW (TYPE U)
MATERIALSTEEL OVERALL
HEAD DIAMETER0.382 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
FEATURES PROVIDEDCASEHARDENED
NONMACHINE NOMINAL THREAD DIAMETER0.209 INCHES IN
HEAD HEIGHT0.139 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
HEAD STYLEROUND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
FF-S-107CInterchangeable
interchangeable cross-reference
interchangeable
80X658Interchangeable
interchangeable cross-reference
interchangeable
143189Interchangeable
interchangeable cross-reference
interchangeable
FFS107TYPECSSTYLE6SInterchangeable
interchangeable cross-reference
interchangeable
172046Interchangeable
interchangeable cross-reference
interchangeable
FFS107Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21318-53?
MS21318-53 is a SCREW,DRIVE.
What parts can replace MS21318-53?
There are 18 known substitutes for MS21318-53: FF-S-107C, 80X658, 143189 and 15 more. Substitute compatibility should be verified for your specific system.
Is MS21318-53 still available?
MS21318-53 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