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PartsTable / COMPONENT / H21-001-004
H21-001-004 ✓ 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: 0.060 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, thread_length: 0.200 INCHES NOMINAL 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 5305-01-331-0030, 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
H21-001-004
NSN: 5305-01-331-0030
FSC: 5305
CAGE: 14304 — L3HARRIS TECHNOLOGIES, INC. DBA HARRIS CORP DIV HARRIS DEFENSE COMMUNICATIONS (USA)
SPECIFICATIONS
head_stylePAN
head_height0.060 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_length0.200 INCHES NOMINAL IN
screw_materialSTEEL CORROSION RESISTING
fastener_length0.250 INCHES NOMINAL IN
special_featuresCREST CUP SPRING WASHER
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.112 INCHES IN
thread_quantity_per_inch40
NSN5305-01-331-0030
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: H21-001-004 · 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 STYLE: PAN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
•
HEAD DIAMETER: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
SCREW MATERIAL: STEEL CORROSION RESISTING
•
FASTENER LENGTH: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEPAN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A A
SPECIAL FEATURESCREST CUP SPRING WASHER
HEAD DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
SCREW MATERIALSTEEL CORROSION RESISTING
FASTENER LENGTH0.250 INCHES NOMINAL IN
THREAD LENGTH0.200 INCHES NOMINAL IN
HEAD HEIGHT0.060 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
4-40 X 1/4Interchangeable
interchangeable cross-reference
interchangeable
FF-S-92B TY III ST 9CInterchangeable
interchangeable cross-reference
interchangeable
8734676-1Interchangeable
interchangeable cross-reference
interchangeable
4-40X1-4RDHDInterchangeable
interchangeable cross-reference
interchangeable
AN515-4-4Interchangeable
interchangeable cross-reference
interchangeable
FFS92ANDTYPE1ANDSTYLE1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H21-001-004?
H21-001-004 is a SCREW,MACHINE.
What parts can replace H21-001-004?
There are 14 known substitutes for H21-001-004: 4-40 X 1/4, FF-S-92B TY III ST 9C, 8734676-1 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H21-001-004?
H21-001-004 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-331-0030. 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