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FON20-7521-17 — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

FON20-7521-17: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 6.3 MILLIMETERS NOMINAL MM, material: STEEL CORROSION RESISTING OVERALL, stud_diameter: 3.2 MILLIMETERS NOMINAL MM, surface_treatment: PASSIVATE OVERALL, stud_assembly_style: STUD ASSEMBLY, eyelet_outside_diameter: 8.0 MILLIMETERS NOMINAL MM. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-588-4156, 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
FON20-7521-17
NSN: 5325-01-588-4156
FSC: 5325 — Fastening Devices
CAGE: H1822 — GKN FOKKER AEROSPACE B.V. (NLD)
SPECIFICATIONS
diameter6.3 MILLIMETERS NOMINAL MM
materialSTEEL CORROSION RESISTING OVERALL
stud_diameter3.2 MILLIMETERS NOMINAL MM
surface_treatmentPASSIVATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter8.0 MILLIMETERS NOMINAL MM
turnlock_stud_head_styleFLAT COUNTERSUNK
NSN5325-01-588-4156
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FON20-7521-17 · 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
•
EYELET OUTSIDE DIAMETER: 8.0 MILLIMETERS NOMINAL MM
•
DIAMETER: 6.3 MILLIMETERS NOMINAL MM
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
STUD DIAMETER: 3.2 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
EYELET OUTSIDE DIAMETER8.0 MILLIMETERS NOMINAL MM
DIAMETER6.3 MILLIMETERS NOMINAL MM
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
STUD ASSEMBLY STYLESTUD ASSEMBLY
STUD DIAMETER3.2 MILLIMETERS NOMINAL MM
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 FON20-7521-17?
FON20-7521-17 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What is the NSN for FON20-7521-17?
FON20-7521-17 is cataloged in the U.S. Government catalog under NSN 5325-01-588-4156. 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.