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587990 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

587990: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: FLAT CHAMFERFLAT CHAMFER, thread_class: 2A2A, head_diameter: 0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN, fastener_length: 0.825 INCHES NOMINAL0.825 INCHES NOMINAL IN, thread_direction: RIGHT-HANDRIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-133-2083, 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
587990
NSN: 5305-01-133-2083
FSC: 5305 — Screws
CAGE: 19139 — EASTMAN KODAK CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleFLAT CHAMFERFLAT CHAMFER
thread_class2A2A
head_diameter0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
fastener_length0.825 INCHES NOMINAL0.825 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentPASSIVATE OVERALLPASSIVATE OVERALL
internal_drive_styleSLOTSLOT
nominal_thread_diameter0.190 INCHES0.190 INCHES IN
first_diameter_from_head0.369 INCHES MINIMUM AND 0.369 INCHES MINIMUM AND 0.374 INCHES MAXIMUM0.374 INCHES MAXIMUM IN
thread_quantity_per_inch3232
thread_series_designatorUNFUNF
NSN5305-01-133-2083
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 587990 · 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
•
FASTENER LENGTH: 0.825 INCHES NOMINAL0.825 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: EK 135B,FSCM 19139 MFR REF SINGLE MATERIAL RESPONSE OVERALLEK 135B,FSCM 19139 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.369 INCHES MINIMUM AND 0.369 INCHES MINIMUM AND 0.374 INCHES MAXIMUM0.374 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES0.190 INCHES IN
•
HEAD STYLE: FLAT CHAMFERFLAT CHAMFER
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
SECOND DIAMETER FROM HEAD: 0.149 INCHES NOMINAL0.149 INCHES NOMINAL IN
•
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY: 22
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.825 INCHES NOMINAL0.825 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONEK 135B,FSCM 19139 MFR REF SINGLE MATERIAL RESPONSE OVERALLEK 135B,FSCM 19139 MFR REF SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.369 INCHES MINIMUM AND 0.369 INCHES MINIMUM AND 0.374 INCHES MAXIMUM0.374 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES0.190 INCHES IN
HEAD STYLEFLAT CHAMFERFLAT CHAMFER
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
SECOND DIAMETER FROM HEAD0.149 INCHES NOMINAL0.149 INCHES NOMINAL IN
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY22
SURFACE TREATMENTPASSIVATE OVERALLPASSIVATE OVERALL
INTERNAL DRIVE STYLESLOTSLOT
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 587990?
587990 is a SCREW,EXTERNALLY RELIEVED BODY.
What is the NSN for 587990?
587990 is cataloged in the U.S. Government catalog under NSN 5305-01-133-2083. 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.