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121J-W550-SS — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

121J-W550-SS: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, grip_length: 0.500 INCHES NOMINAL IN, head_length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN, stud_head_height: 0.438 INCHES NOMINAL IN, shank_neck_length: 0.250 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-206-7502, 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
121J-W550-SS
NSN: 5325-01-206-7502
FSC: 5325 — Fastening Devices
CAGE: 72794 — SOUTHCO INC (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
grip_length0.500 INCHES NOMINAL IN
head_length1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
stud_head_height0.438 INCHES NOMINAL IN
shank_neck_length0.250 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
turnlock_stud_head_styleFILLISTER WING
stud_shank_major_diameter0.307 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_document_and_classificationASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5325-01-206-7502
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121J-W550-SS · 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: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HEAD LENGTH: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
STUD HEAD HEIGHT: 0.438 INCHES NOMINAL IN
•
SHANK NECK LENGTH: 0.250 INCHES NOMINAL IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER WING
•
STUD SHANK MAJOR DIAMETER: 0.307 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAD LENGTH1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
STUD HEAD HEIGHT0.438 INCHES NOMINAL IN
SHANK NECK LENGTH0.250 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFILLISTER WING
STUD SHANK MAJOR DIAMETER0.307 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 303 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 1
AJW5-50SSReference 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 121J-W550-SS?
121J-W550-SS is a STUD,TURNLOCK FASTENER.
What parts can replace 121J-W550-SS?
There is 1 known substitute for 121J-W550-SS: AJW5-50SS. Substitute compatibility should be verified for your specific system.
What is the NSN for 121J-W550-SS?
121J-W550-SS is cataloged in the U.S. Government catalog under NSN 5325-01-206-7502. 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.