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40S128-24-2AA — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

40S128-24-2AA: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.435 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN, material: STEEL CORROSION RESISTING OR STEEL COMP 302 METALLIC PARTS, drive_type: SLOTTED, eyelet_length: 0.458 INCHES NOMINAL IN, surface_treatment: PASSIVATE METALLIC PARTS, stud_assembly_style: STUD ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-672-9943, 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
40S128-24-2AA
NSN: 5325-01-672-9943
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.435 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
materialSTEEL CORROSION RESISTING OR STEEL COMP 302 METALLIC PARTS
drive_typeSLOTTED
eyelet_length0.458 INCHES NOMINAL IN
surface_treatmentPASSIVATE METALLIC PARTS
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter0.369 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
turnlock_stud_head_styleFILLISTER
material_document_and_classificationAMS-QQ-S-763 NATIONAL STD SINGLE MATERIAL RESPONSE OR ASTM A580 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE METALLIC PARTS
part_name_assigned_by_controlling_agencyCAM LOCK
surface_treatment_document_and_classificationAMS-QQ-P-35 NATIONAL STD SINGLE TREATMENT RESPONSE METALLIC PARTS
distance_from_engaging_member_to_largest_bearing_surface_of_head1.273 INCHES MINIMUM AND 1.283 INCHES MAXIMUM IN
NSN5325-01-672-9943
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 40S128-24-2AA · 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: AMS-QQ-P-35 NATIONAL STD SINGLE TREATMENT RESPONSE METALLIC PARTS
•
EYELET OUTSIDE DIAMETER: 0.369 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-QQ-S-763 NATIONAL STD SINGLE MATERIAL RESPONSE OR ASTM A580 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE METALLIC PARTS
•
DIAMETER: 0.435 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 1.273 INCHES MINIMUM AND 1.283 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
SURFACE TREATMENT: PASSIVATE METALLIC PARTS
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS-QQ-P-35 NATIONAL STD SINGLE TREATMENT RESPONSE METALLIC PARTS
EYELET OUTSIDE DIAMETER0.369 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-QQ-S-763 NATIONAL STD SINGLE MATERIAL RESPONSE OR ASTM A580 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE METALLIC PARTS
DIAMETER0.435 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD1.273 INCHES MINIMUM AND 1.283 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFILLISTER
SURFACE TREATMENTPASSIVATE METALLIC PARTS
PART NAME ASSIGNED BY CONTROLLING AGENCYCAM LOCK
MATERIALSTEEL CORROSION RESISTING OR STEEL COMP 302 METALLIC PARTS
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
SK40S128-24-2AASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 40S128-24-2AA?
40S128-24-2AA is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 40S128-24-2AA?
There is 1 known substitute for 40S128-24-2AA: SK40S128-24-2AA. Substitute compatibility should be verified for your specific system.
What is the NSN for 40S128-24-2AA?
40S128-24-2AA is cataloged in the U.S. Government catalog under NSN 5325-01-672-9943. 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.