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Technical Data Sheet
PartsTable / COMPONENT / HS4431-8
HS4431-8 ✓ 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

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.500 INCHES NOMINAL IN, material: STEEL OVERALL, drive_type: SLOTTED, eyelet_length: 0.322 INCHES NOMINAL IN, features_provided: ALL METAL LOCKING ELEMENT, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-211-6924, 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
HS4431-8
NSN: 5325-01-211-6924
FSC: 5325
CAGE: 8V613 — THE BOEING COMPANY (USA)
SPECIFICATIONS
diameter0.500 INCHES NOMINAL IN
materialSTEEL OVERALL
drive_typeSLOTTED
eyelet_length0.322 INCHES NOMINAL IN
features_providedALL METAL LOCKING ELEMENT
surface_treatmentCADMIUM OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeSPRING
eyelet_outside_diameter0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
turnlock_stud_head_styleFILLISTER
specification/standard_data02731-HS4431 MANUFACTURERS STANDARD
material_accommodated_thickness0.240 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
NSN5325-01-211-6924
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HS4431-8 · 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
•
SECURING DEVICE TYPE: SPRING
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
SPECIFICATION/STANDARD DATA: 02731-HS4431 MANUFACTURERS STANDARD
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
EYELET LENGTH: 0.322 INCHES NOMINAL IN
•
FEATURES PROVIDED: ALL METAL LOCKING ELEMENT
•
DRIVE TYPE: SLOTTED
TECHNICAL CHARACTERISTICS (FLIS)
SECURING DEVICE TYPESPRING
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
SPECIFICATION/STANDARD DATA02731-HS4431 MANUFACTURERS STANDARD
TURNLOCK STUD HEAD STYLEFILLISTER
EYELET LENGTH0.322 INCHES NOMINAL IN
FEATURES PROVIDEDALL METAL LOCKING ELEMENT
DRIVE TYPESLOTTED
STUD ASSEMBLY STYLESTUD ASSEMBLY
EYELET OUTSIDE DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
5253-635Interchangeable
interchangeable cross-reference
interchangeable
276Interchangeable
interchangeable cross-reference
interchangeable
AS568B-008Interchangeable
interchangeable cross-reference
interchangeable
32-300Interchangeable
interchangeable cross-reference
interchangeable
LD3041Interchangeable
interchangeable cross-reference
interchangeable
7031680Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HS4431-8?
HS4431-8 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace HS4431-8?
There are 10 known substitutes for HS4431-8: 5253-635, 276, AS568B-008 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HS4431-8?
HS4431-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-211-6924. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026