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Technical Data Sheet
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EF603-6 — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

EF603-6: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: TORQUE SET, turnlock_stud_head_style: FILLISTER. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-449-2527, 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
EF603-6
NSN: 5325-01-449-2527
FSC: 5325 — Fastening Devices
CAGE: U7941 — LEONARDO UK LIMITED (AW/EH101) (GBR)
SPECIFICATIONS
diameter0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeTORQUE SET
turnlock_stud_head_styleFILLISTER
NSN5325-01-449-2527
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: EF603-6 · 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
•
DRIVE TYPE: TORQUE SET
•
DIAMETER: 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
DRIVE TYPETORQUE SET
DIAMETER0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFILLISTER
MATERIALSTEEL OVERALL
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is EF603-6?
EF603-6 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What is the NSN for EF603-6?
EF603-6 is cataloged in the U.S. Government catalog under NSN 5325-01-449-2527. 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.