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27S3-4F — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

27S3-4F: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.391 INCHES NOMINAL IN, material: STEEL COMP 4037 OVERALL, surface_treatment: ZINC PIN, turnlock_stud_head_style: FLAT COUNTERSUNK, part_name_assigned_by_controlling_agency: STUD ASSEMBLY, FLUSH HEAD, CROSS RECESS. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-580-9799, 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
27S3-4F
NSN: 5325-01-580-9799
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.391 INCHES NOMINAL IN
materialSTEEL COMP 4037 OVERALL
surface_treatmentZINC PIN
turnlock_stud_head_styleFLAT COUNTERSUNK
part_name_assigned_by_controlling_agencySTUD ASSEMBLY, FLUSH HEAD, CROSS RECESS
NSN5325-01-580-9799
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 27S3-4F · 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
•
DIAMETER: 0.391 INCHES NOMINAL IN
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
•
SURFACE TREATMENT: CHROMIUM STUD
•
MATERIAL: STEEL COMP 4037 OVERALL
TECHNICAL CHARACTERISTICS
DIAMETER0.391 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
SURFACE TREATMENTCHROMIUM STUD
SURFACE TREATMENTZINC PIN
PART NAME ASSIGNED BY CONTROLLING AGENCYSTUD ASSEMBLY, FLUSH HEAD, CROSS RECESS
MATERIALSTEEL COMP 4037 OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
10352517Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 27S3-4F?
27S3-4F is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 27S3-4F?
There is 1 known substitute for 27S3-4F: 10352517. Substitute compatibility should be verified for your specific system.
What is the NSN for 27S3-4F?
27S3-4F is cataloged in the U.S. Government catalog under NSN 5325-01-580-9799. 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.