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ST3M591-4-9 — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M591-4-9: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, grip_length: 1.562 INCHES NOMINAL IN, special_features: 0.250-28 UNF 3A THD A, surface_treatment: PASSIVATE OVERALL, stud_shank_major_diameter: 0.228 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-425-5221, 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
ST3M591-4-9
NSN: 5325-00-425-5221
FSC: 5325 — Fastening Devices
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
grip_length1.562 INCHES NOMINAL IN
special_features0.250-28 UNF 3A THD A
surface_treatmentPASSIVATE OVERALL
stud_shank_major_diameter0.228 INCHES NOMINAL IN
NSN5325-00-425-5221
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M591-4-9 · 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
•
STUD SHANK MAJOR DIAMETER: 0.228 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
GRIP LENGTH: 1.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STUD SHANK MAJOR DIAMETER0.228 INCHES NOMINAL IN
SPECIAL FEATURES0.250-28 UNF 3A THD A
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
GRIP LENGTH1.562 INCHES NOMINAL 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 2
AVL275-9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
CS5017-4-9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 ST3M591-4-9?
ST3M591-4-9 is a STUD,TURNLOCK FASTENER.
What parts can replace ST3M591-4-9?
There are 2 known substitutes for ST3M591-4-9: AVL275-9, CS5017-4-9. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M591-4-9?
ST3M591-4-9 is cataloged in the U.S. Government catalog under NSN 5325-00-425-5221. 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.