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581R439H10 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

581R439H10: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: BEVEL-CONICAL, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.220 INCHES NOMINAL IN, thread_length: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-085-9727, 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
581R439H10
NSN: 5306-01-085-9727
FSC: 5306 — Bolts
CAGE: 97942 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleBEVEL-CONICAL
head_height0.250 INCHES NOMINAL IN
thread_class3A A
head_diameter0.220 INCHES NOMINAL IN
thread_length0.250 INCHES NOMINAL IN
fastener_length0.493 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.110 INCHES NOMINAL IN
internal_drive_styleHEXAGON
end_item_identificationAN/ALQ-131 BLOCK I
NSN5306-01-085-9727
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 581R439H10 · 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: 0.110 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.493 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.250 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.178 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.110 INCHES NOMINAL IN
HEAD HEIGHT0.250 INCHES NOMINAL IN
FASTENER LENGTH0.493 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.178 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD STYLEBEVEL-CONICAL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 581R439H10?
581R439H10 is a BOLT,INTERNAL WRENCHING.
What is the NSN for 581R439H10?
581R439H10 is cataloged in the U.S. Government catalog under NSN 5306-01-085-9727. 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.