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Technical Data Sheet
PartsTable / COMPONENT / AJ4-50
AJ4-50 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.438 INCHES NOMINAL IN, material: STEEL OVERALL, drive_type: SLOTTED, grip_length: 0.500 INCHES NOMINAL IN, shank_neck_length: 0.250 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-281-5098, 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
AJ4-50
NSN: 5325-00-281-5098
FSC: 5325
CAGE: 72794 — SOUTHCO INC (USA)
SPECIFICATIONS
diameter0.438 INCHES NOMINAL IN
materialSTEEL OVERALL
drive_typeSLOTTED
grip_length0.500 INCHES NOMINAL IN
shank_neck_length0.250 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
turnlock_stud_head_styleFILLISTER
stud_shank_major_diameter0.250 INCHES NOMINAL IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.322 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
NSN5325-00-281-5098
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AJ4-50 · 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
•
SHANK NECK LENGTH: 0.250 INCHES NOMINAL IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
MATERIAL ACCOMMODATED THICKNESS: 0.322 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
•
DIAMETER: 0.438 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
GRIP LENGTH: 0.500 INCHES NOMINAL IN
•
DRIVE TYPE: SLOTTED
TECHNICAL CHARACTERISTICS (FLIS)
SHANK NECK LENGTH0.250 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFILLISTER
TURNLOCK STUD SHANK STYLESTUD SHANK
MATERIAL ACCOMMODATED THICKNESS0.322 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
DIAMETER0.438 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
GRIP LENGTH0.500 INCHES NOMINAL IN
DRIVE TYPESLOTTED
STUD SHANK MAJOR DIAMETER0.250 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
26882Interchangeable
interchangeable cross-reference
interchangeable
K26882Interchangeable
interchangeable cross-reference
interchangeable
0209899-4Interchangeable
interchangeable cross-reference
interchangeable
FF-S-85Interchangeable
interchangeable cross-reference
interchangeable
SYM2688P2Interchangeable
interchangeable cross-reference
interchangeable
3JRBB10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AJ4-50?
AJ4-50 is a STUD,TURNLOCK FASTENER.
What parts can replace AJ4-50?
There are 7 known substitutes for AJ4-50: 26882, K26882, 0209899-4 and 4 more. Substitute compatibility should be verified for your specific system.
Is AJ4-50 still available?
AJ4-50 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026