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581-6405749-B44 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

581-6405749-B44: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400 OVERALL, head_style: HEXAGON, head_height: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.750 INCHES NOMINAL IN, fastener_length: 3.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-442-9170, 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
581-6405749-B44
NSN: 5305-01-442-9170
FSC: 5305 — Screws
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY 400 OVERALL
head_styleHEXAGON
head_height0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
thread_class2A A
thread_length1.750 INCHES NOMINAL IN
fastener_length3.250 INCHES NOMINAL IN
locking_featurePATCH OR PELLET OR STRIP THREADS
thread_directionRIGHT-HAND
width_between_flats1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch10
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-442-9170
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 581-6405749-B44 · 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: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.250 INCHES NOMINAL IN
•
THREAD LENGTH: 1.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
•
LOCKING FEATURE: PATCH OR PELLET OR STRIP THREADS
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
FASTENER LENGTH3.250 INCHES NOMINAL IN
THREAD LENGTH1.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.750 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
LOCKING FEATUREPATCH OR PELLET OR STRIP THREADS
THREAD CLASS2A A
THREAD QUANTITY PER INCH10
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 1
218007052Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 581-6405749-B44?
581-6405749-B44 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 581-6405749-B44?
There is 1 known substitute for 581-6405749-B44: 218007052. Substitute compatibility should be verified for your specific system.
What is the NSN for 581-6405749-B44?
581-6405749-B44 is cataloged in the U.S. Government catalog under NSN 5305-01-442-9170. This indicates validated use in U.S. government and defense supply chains.
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