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AJ4-451B — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AJ4-451B: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.440 INCHES NOMINAL IN, material: STEEL OVERALL, drive_type: SLOTTED, grip_length: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN, shank_neck_length: 0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN, surface_treatment: CHROMATE AND ZINC OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-270-3908, 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
AJ4-451B
NSN: 5325-01-270-3908
FSC: 5325 — Fastening Devices
CAGE: 72794 — SOUTHCO INC (USA)
SPECIFICATIONS
diameter0.440 INCHES NOMINAL IN
materialSTEEL OVERALL
drive_typeSLOTTED
grip_length0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
shank_neck_length0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
surface_treatmentCHROMATE AND ZINC OVERALL
turnlock_stud_head_styleFILLISTER
stud_shank_major_diameter0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.341 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
surface_treatment_document_and_classificationASTM B633,FE/ZN25 SC4 ASSN STD ALL TREATMENT RESPONSES OVERALL
NSN5325-01-270-3908
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AJ4-451B · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,FE/ZN25 SC4 ASSN STD ALL TREATMENT RESPONSES OVERALL
•
DRIVE TYPE: SLOTTED
•
MATERIAL ACCOMMODATED THICKNESS: 0.341 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
DIAMETER: 0.440 INCHES NOMINAL IN
•
SHANK NECK LENGTH: 0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
STUD SHANK MAJOR DIAMETER: 0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633,FE/ZN25 SC4 ASSN STD ALL TREATMENT RESPONSES OVERALL
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.341 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
DIAMETER0.440 INCHES NOMINAL IN
SHANK NECK LENGTH0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFILLISTER
STUD SHANK MAJOR DIAMETER0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
SURFACE TREATMENTCHROMATE AND ZINC OVERALL
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 2
A323T302-101Reference document
Same NSN cross-reference
Reference document — Secondary reference
AJ4-45ZBBReference document
Same NSN cross-reference
Reference document — Secondary reference
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 AJ4-451B?
AJ4-451B is a STUD,TURNLOCK FASTENER.
What parts can replace AJ4-451B?
There are 2 known substitutes for AJ4-451B: A323T302-101, AJ4-45ZBB. Substitute compatibility should be verified for your specific system.
What is the NSN for AJ4-451B?
AJ4-451B is cataloged in the U.S. Government catalog under NSN 5325-01-270-3908. 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.