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Technical Data Sheet
PartsTable / COMPONENT / MD-2-421
MD-2-421 ✓ 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,TAPPING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: ROUND, head_height: 0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN, head_diameter: 0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN, fastener_length: 1.250 INCHES NOMINAL IN, features_provided: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-281-5993, 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
MD-2-421
NSN: 5305-00-281-5993
FSC: 5305
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleROUND
head_height0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN
head_diameter0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
fastener_length1.250 INCHES NOMINAL IN
features_providedCASEHARDENED
surface_treatmentCADMIUM OR ZINC OVERALL
internal_drive_styleCROSS RECESS TYPE 1
nonmachine_thread_styleDOG TYPE (TYPE B OR C)
nondefinitive_spec/std_dataB TYPE
nonmachine_nominal_thread_diameter0.190 INCHES IN
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
NSN5305-00-281-5993
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MD-2-421 · 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
•
NONDEFINITIVE SPEC/STD DATA: B TYPE
•
HEAD STYLE: ROUND
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATAB TYPE
HEAD STYLEROUND
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
MATERIALSTEEL OVERALL
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
FASTENER LENGTH1.250 INCHES NOMINAL IN
HEAD DIAMETER0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD HEIGHT0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MD-2-421?
MD-2-421 is a SCREW,TAPPING.
What parts can replace MD-2-421?
There are 18 known substitutes for MD-2-421: FF-S-107C, 80X658, 143189 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MD-2-421?
MD-2-421 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-281-5993. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026