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1920S4-3 — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

1920S4-3: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.358 INCHES NOMINAL IN, material: STEEL COMP 431 OVERALL, drive_type: SOCKET, grip_length: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN, extension_length: 0.361 INCHES NOMINAL IN, stud_head_height: 0.0194 INCHES MINIMUM AND 0.0240 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-974-0582, 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
1920S4-3
NSN: 5325-00-974-0582
FSC: 5325 — Fastening Devices
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
diameter0.358 INCHES NOMINAL IN
materialSTEEL COMP 431 OVERALL
drive_typeSOCKET
grip_length0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
extension_length0.361 INCHES NOMINAL IN
stud_head_height0.0194 INCHES MINIMUM AND 0.0240 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
securing_device_typeRING
turnlock_stud_head_styleFLAT FILLISTER
stud_shank_major_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
NSN5325-00-974-0582
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1920S4-3 · 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: SOCKET
•
MATERIAL ACCOMMODATED THICKNESS: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
EXTENSION LENGTH: 0.361 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18732 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.358 INCHES NOMINAL IN
•
STUD HEAD HEIGHT: 0.0194 INCHES MINIMUM AND 0.0240 INCHES MAXIMUM IN
•
SECURING DEVICE TYPE: RING
TECHNICAL CHARACTERISTICS
DRIVE TYPESOCKET
MATERIAL ACCOMMODATED THICKNESS0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
EXTENSION LENGTH0.361 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18732 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.358 INCHES NOMINAL IN
STUD HEAD HEIGHT0.0194 INCHES MINIMUM AND 0.0240 INCHES MAXIMUM IN
SECURING DEVICE TYPERING
TURNLOCK STUD HEAD STYLEFLAT FILLISTER
STUD SHANK MAJOR DIAMETER0.2485 INCHES MINIMUM AND 0.2495 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 1
BACF34D4B3SSame 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 1920S4-3?
1920S4-3 is a STUD,TURNLOCK FASTENER.
What parts can replace 1920S4-3?
There is 1 known substitute for 1920S4-3: BACF34D4B3S. Substitute compatibility should be verified for your specific system.
What is the NSN for 1920S4-3?
1920S4-3 is cataloged in the U.S. Government catalog under NSN 5325-00-974-0582. 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.