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399066 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

399066: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include head_style: HEXAGON EXTENDED WASHER, head_height: 0.370 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, thread_class: 2A A, fastener_length: 1.000 INCHES NOMINAL IN, special_features: SPIRALLING TEETH ON EDGE OF HEAD FLANGE, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-434-7252, 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
399066
NSN: 5305-01-434-7252
FSC: 5305 — Screws
CAGE: 04627 — HYSTER-YALE GROUP, INC. DIV HYSTER-YALE MATERIALS HANDLING (USA)
SPECIFICATIONS
head_styleHEXAGON EXTENDED WASHER
head_height0.370 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_class2A A
fastener_length1.000 INCHES NOMINAL IN
special_featuresSPIRALLING TEETH ON EDGE OF HEAD FLANGE
thread_directionRIGHT-HAND
surface_treatmentZINC AND CADMIUM OVERALL
width_between_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
nominal_thread_diameter0.375 INCHES IN
extended_washer_diameter0.890 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
thread_quantity_per_inch24
thread_series_designatorUNF
NSN5305-01-434-7252
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 399066 · 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
•
HEAD HEIGHT: 0.370 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.890 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429, GRADE 5 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: HEXAGON EXTENDED WASHER
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.370 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
FASTENER LENGTH1.000 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.890 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE J429, GRADE 5 ASSN STD ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEHEXAGON EXTENDED WASHER
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
SPECIAL FEATURESSPIRALLING TEETH ON EDGE OF HEAD FLANGE
SURFACE TREATMENTZINC AND CADMIUM OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
321959Reference 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 399066?
399066 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 399066?
There is 1 known substitute for 399066: 321959. Substitute compatibility should be verified for your specific system.
What is the NSN for 399066?
399066 is cataloged in the U.S. Government catalog under NSN 5305-01-434-7252. 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.