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2558779-2 — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

2558779-2: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, material: STEEL COMP 8740 OVERALL, drive_type: SOCKET, grip_length: 0.291 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN, extension_length: 0.144 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN, stud_head_height: 0.105 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-240-0443, 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
2558779-2
NSN: 5325-01-240-0443
FSC: 5325 — Fastening Devices
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
diameter0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
materialSTEEL COMP 8740 OVERALL
drive_typeSOCKET
grip_length0.291 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN
extension_length0.144 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
stud_head_height0.105 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
turnlock_stud_head_styleFLAT FILLISTER
stud_shank_major_diameter0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
specification/standard_data10001-2558779-2 MANUFACTURERS SPECIFICATION CONTROL
material_document_and_classificationQQ-S-624 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5325-01-240-0443
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 2558779-2 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DRIVE TYPE: SOCKET
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
EXTENSION LENGTH: 0.144 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
STUD HEAD HEIGHT: 0.105 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 10001-2558779-2 MANUFACTURERS SPECIFICATION CONTROL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DRIVE TYPESOCKET
TURNLOCK STUD SHANK STYLESTUD SHANK
EXTENSION LENGTH0.144 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
STUD HEAD HEIGHT0.105 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA10001-2558779-2 MANUFACTURERS SPECIFICATION CONTROL
TURNLOCK STUD HEAD STYLEFLAT FILLISTER
STUD SHANK MAJOR DIAMETER0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2558779-2?
2558779-2 is a STUD,TURNLOCK FASTENER.
What is the NSN for 2558779-2?
2558779-2 is cataloged in the U.S. Government catalog under NSN 5325-01-240-0443. 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.