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581R439H05 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

581R439H05: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_length: 0.096 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-464-9838, 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
581R439H05
NSN: 5305-01-464-9838
FSC: 5305 — Screws
CAGE: 97942 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_length0.096 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.271 INCHES MINIMUM AND 0.293 INCHES MAXIMUM IN
shoulder_length0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.124 INCHES MINIMUM AND 0.125 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
NSN5305-01-464-9838
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 581R439H05 · 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: 0.780 INCHES MINIMUM AND 0.800 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.271 INCHES MINIMUM AND 0.293 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.124 INCHES MINIMUM AND 0.125 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.096 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.780 INCHES MINIMUM AND 0.800 INCHES MAXIMUM IN
HEAD HEIGHT0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
FASTENER LENGTH0.271 INCHES MINIMUM AND 0.293 INCHES MAXIMUM IN
SHOULDER LENGTH0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.124 INCHES MINIMUM AND 0.125 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.096 INCHES MINIMUM AND 0.116 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEFLAT CHAMFER
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
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 581R439H05?
581R439H05 is a SCREW,SHOULDER.
What is the NSN for 581R439H05?
581R439H05 is cataloged in the U.S. Government catalog under NSN 5305-01-464-9838. 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.