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438-6404476-34 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

438-6404476-34: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, head_style: KNURLED NO. 1, thread_class: 2A A, thread_length: 1.600 INCHES MAXIMUM IN, fastener_length: 1.600 INCHES NOMINAL IN, thread_direction: RIGHT-HAND.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-398-0772, 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
438-6404476-34
NSN: 5305-01-398-0772
FSC: 5305 — Screws
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
head_styleKNURLED NO. 1
thread_class2A A
thread_length1.600 INCHES MAXIMUM IN
fastener_length1.600 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentENAMEL SEMIGLOSS OVERALL
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-398-0772
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 438-6404476-34 · 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
•
FASTENER LENGTH: 1.600 INCHES NOMINAL IN
•
THREAD LENGTH: 1.600 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: KNURLED NO. 1
•
THREAD DIRECTION: RIGHT-HAND
•
COLOR: GRAY/GREY OVERALL
•
SURFACE TREATMENT: ENAMEL SEMIGLOSS OVERALL
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.600 INCHES NOMINAL IN
THREAD LENGTH1.600 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEKNURLED NO. 1
THREAD DIRECTIONRIGHT-HAND
COLORGRAY/GREY OVERALL
SURFACE TREATMENTENAMEL SEMIGLOSS OVERALL
THREAD CLASS2A A
THREAD QUANTITY PER INCH20
MATERIALSTEEL COMP 304 OVERALL
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 5
438-6726443-16AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
6404394 FIND 2Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
438-6404469-36Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
6404450 FIND 18Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
438-6404478-8Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 438-6404476-34?
438-6404476-34 is a THUMBSCREW.
What parts can replace 438-6404476-34?
There are 5 known substitutes for 438-6404476-34: 438-6726443-16A, 6404394 FIND 2, 438-6404469-36 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 438-6404476-34?
438-6404476-34 is cataloged in the U.S. Government catalog under NSN 5305-01-398-0772. 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.