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581R277H02 — RETAINER,FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

581R277H02: RETAINER,FASTENER.

The RETAINER,FASTENER is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: STEEL QQ-5-764,PASSIVATED QQ-P-35,0.250 IN. LG,0.250-28 UNF 2A THD,0.350 IN.

MIN,0.398 IN. MAX DIA HEAD A. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-563-9330, 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
581R277H02
NSN: 5325-00-563-9330
FSC: 5325 — Fastening Devices
CAGE: 48306 — NORTHROP GRUMMAN SUPPORT SERVICES CORP (USA)
SPECIFICATIONS
general_characteristics_item_descriptionSTEEL QQ-5-764,PASSIVATED QQ-P-35,0.250 IN. LG,0.250-28 UNF 2A THD,0.350 IN. MIN,0.398 IN. MAX DIA HEAD A
NSN5325-00-563-9330
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 581R277H02 · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL QQ-5-764,PASSIVATED QQ-P-35,0.250 IN. LG,0.250-28 UNF 2A THD,0.350 IN. MIN,0.398 IN. MAX DIA HEAD A
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL QQ-5-764,PASSIVATED QQ-P-35,0.250 IN. LG,0.250-28 UNF 2A THD,0.350 IN. MIN,0.398 IN. MAX DIA HEAD A
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
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 581R277H02?
581R277H02 is a RETAINER,FASTENER.
What is the NSN for 581R277H02?
581R277H02 is cataloged in the U.S. Government catalog under NSN 5325-00-563-9330. 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.