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12S1-11-1AA — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12S1-11-1AA: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: SLOTTED, stud_diameter: 0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN, stud_head_height: 0.590 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-225-4844, 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
12S1-11-1AA
NSN: 5325-00-225-4844
FSC: 5325 — Fastening Devices
CAGE: A0126 — LEONARDO SPA HELICOPTERS DIVISION - PRODUCTION SITE (ITA)
SPECIFICATIONS
diameter0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeSLOTTED
stud_diameter0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN
stud_head_height0.590 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeWASHER
end_item_identificationAIRCRAFT, THUNDERBOLT II, A-10; HELICOPTER, UTILITY/SEARCH AND RECOVERY UN-1N; AIRCRAFT, ORION P-3; AIRCRAFT, GALAXY C-5; DEEP SUBMERGENCE SYSTEMS PROGRAMS (DSSP)
eyelet_outside_diameter0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT FILLISTER
material_accommodated_thickness0.125 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN
NSN5325-00-225-4844
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12S1-11-1AA · 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-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EYELET OUTSIDE DIAMETER: 0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
MATERIAL ACCOMMODATED THICKNESS: 0.125 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN
•
DIAMETER: 0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
•
STUD HEAD HEIGHT: 0.590 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
•
SECURING DEVICE TYPE: WASHER
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.296 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EYELET OUTSIDE DIAMETER0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.125 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN
DIAMETER0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
STUD HEAD HEIGHT0.590 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
SECURING DEVICE TYPEWASHER
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.296 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFLAT FILLISTER
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 4
5325PL2022828Reference document
Same NSN cross-reference
Reference document — Informative reference only
39-1122Reference document
Same NSN cross-reference
Reference document — Secondary reference
WDG9027-36Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
330C542-7Reference 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 12S1-11-1AA?
12S1-11-1AA is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 12S1-11-1AA?
There are 4 known substitutes for 12S1-11-1AA: 5325PL2022828, 39-1122, WDG9027-36 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12S1-11-1AA?
12S1-11-1AA is cataloged in the U.S. Government catalog under NSN 5325-00-225-4844. 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.