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90821A559 — SCREW,SELF-DRILLING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

90821A559: SCREW,SELF-DRILLING.

The SCREW,SELF-DRILLING is a the manufacturer industrial component. Key specifications include material: STEEL PROPERTY CLASS 18.8 OVERALL, head_style: HEXAGON EXTENDED WASHERHEXAGON EXTENDED WASHER, head_height: 0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN, point_style: SELF-DRILLINGSELF-DRILLING, pilot_length: 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN, point_length: 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-654-2804, 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
90821A559
NSN: 5305-01-654-2804
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL PROPERTY CLASS 18.8 OVERALL
head_styleHEXAGON EXTENDED WASHERHEXAGON EXTENDED WASHER
head_height0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN
point_styleSELF-DRILLINGSELF-DRILLING
pilot_length0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN
point_length0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN
fastener_length1.50 INCHES NOMINAL1.50 INCHES NOMINAL IN
special_featuresSCREW IS ROHS COMPLIANTSCREW IS ROHS COMPLIANT
thread_directionRIGHT-HANDRIGHT-HAND
width_between_flats0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
internal_drive_styleW/O INTERNAL DRIVEW/O INTERNAL DRIVE
end_item_identification4220-01-618-62664220-01-618-6266
NSN5305-01-654-2804
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 90821A559 · 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
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.250 INCHES0.250 INCHES IN
•
HEAD HEIGHT: 0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN
•
POINT LENGTH: 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.50 INCHES NOMINAL1.50 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PROTECTIVE GRAY FINISH MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.520 INCHES NOMINAL0.520 INCHES NOMINAL IN
•
NONMACHINE THREAD STYLE: SELF DRILLINGSELF DRILLING
•
NOMINAL THREAD DIAMETER: 0.250 INCHES0.250 INCHES IN
TECHNICAL CHARACTERISTICS
NONMACHINE NOMINAL THREAD DIAMETER0.250 INCHES0.250 INCHES IN
HEAD HEIGHT0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN
POINT LENGTH0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN
FASTENER LENGTH1.50 INCHES NOMINAL1.50 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPROTECTIVE GRAY FINISH MFR REF SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.520 INCHES NOMINAL0.520 INCHES NOMINAL IN
NONMACHINE THREAD STYLESELF DRILLINGSELF DRILLING
NOMINAL THREAD DIAMETER0.250 INCHES0.250 INCHES IN
HEAD STYLEHEXAGON EXTENDED WASHERHEXAGON EXTENDED WASHER
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 1
19E2401085-3Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 90821A559?
90821A559 is a SCREW,SELF-DRILLING.
What parts can replace 90821A559?
There is 1 known substitute for 90821A559: 19E2401085-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 90821A559?
90821A559 is cataloged in the U.S. Government catalog under NSN 5305-01-654-2804. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.