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90298A578 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

90298A578: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: KNURLED NO. 5, head_height: 0.2188 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.4375 INCHES NOMINAL IN, thread_length: 0.4375 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-681-6489, 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
90298A578
NSN: 5305-01-681-6489
FSC: 5305 — Screws
CAGE: 549W5 — SPECTRAL LABS INCORPORATED DBA SPECTRAL LABS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleKNURLED NO. 5
head_height0.2188 INCHES NOMINAL IN
thread_class3A A
head_diameter0.4375 INCHES NOMINAL IN
thread_length0.4375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
shoulder_diameter0.3125 INCHES NOMINAL OVERALL IN
surface_treatmentPASSIVATE OVERALL
width_across_flats0.156 INCHES NOMINAL IN
internal_drive_styleHEXAGON
end_item_identificationLLH0B2633
NSN5305-01-681-6489
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 90298A578 · 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
•
WIDTH ACROSS FLATS: 0.156 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.2188 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 0.3125 INCHES NOMINAL OVERALL IN
•
THREAD LENGTH: 0.4375 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: KNURLED NO. 5
•
THREAD DIRECTION: RIGHT-HAND
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.156 INCHES NOMINAL IN
HEAD HEIGHT0.2188 INCHES NOMINAL IN
SHOULDER DIAMETER0.3125 INCHES NOMINAL OVERALL IN
THREAD LENGTH0.4375 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEKNURLED NO. 5
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTPASSIVATE OVERALL
INTERNAL DRIVE STYLEHEXAGON
THREAD CLASS3A A
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

No substitute or cross-reference records for this part.

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 90298A578?
90298A578 is a SCREW,SHOULDER.
What is the NSN for 90298A578?
90298A578 is cataloged in the U.S. Government catalog under NSN 5305-01-681-6489. 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.