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40S5 — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

40S5: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN, material: STEEL COMP 302 PIN, drive_type: CROSS RECESS, eyelet_length: 0.472 INCHES NOMINAL IN, stud_head_height: 0.102 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-639-7954, 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
40S5
NSN: 5325-00-639-7954
NIINs: 006397954, 016253874, 016253880
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
materialSTEEL COMP 302 PIN
drive_typeCROSS RECESS
eyelet_length0.472 INCHES NOMINAL IN
special_featuresSPACER MATERIAL IS 300 SERIES CRES PER ASTM A666 OR ASTM A240;SPRING MATERIAL IS 302 CRES PER ASTM A313 OR AMS-QQ-S-763;CUP MATERIAL IS 300 SERIES CRES PER ASTM A167,ASTM A240,ASTM A582 OR ASTM A666
stud_head_height0.102 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
end_item_identificationCH-53A/D/E A
eyelet_outside_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
turnlock_stud_head_styleSTUD HEAD
material_accommodated_thickness0.231 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
NSN5325-00-639-7954
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 40S5 · 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: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
DRIVE TYPE: CROSS RECESS
•
MATERIAL ACCOMMODATED THICKNESS: 0.141 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE PIN
•
DIAMETER: 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
•
STUD HEAD HEIGHT: 0.102 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EYELET OUTSIDE DIAMETER0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
DRIVE TYPECROSS RECESS
MATERIAL ACCOMMODATED THICKNESS0.141 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE PIN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE EJECTOR SPRING
DIAMETER0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
STUD HEAD HEIGHT0.102 INCHES NOMINAL IN
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLESTUD HEAD
SUBSTITUTES & CROSS-REFERENCES 7
12861-899-29Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
BACS21X4RReference document
Same NSN cross-reference
Reference document — Secondary reference
BACS21ED4RReference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
40S119-4-4BBReference document
Same NSN cross-reference
Reference document — Secondary reference
1142005-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5325PL0952442Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 40S5?
40S5 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 40S5?
There are 7 known substitutes for 40S5: 12861-899-29, BACS21X4R, BACS21ED4R and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40S5?
40S5 is cataloged in the U.S. Government catalog under NSN 5325-00-639-7954. 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.