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Technical Data Sheet
PartsTable / COMPONENT / M641
M641 ✓ 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

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, nominal_thread_size: 0.190 INCHES IN, end_item_identification: USED ON ANZAC SHIP FORWARD CHECK VALVE ASSEMBLY. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-200-5460, 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
M641
NSN: 5325-00-200-5460
FSC: 5325
CAGE: 05643 — BARBER-GREENE CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
nominal_thread_size0.190 INCHES IN
end_item_identificationUSED ON ANZAC SHIP FORWARD CHECK VALVE ASSEMBLY
thread_quantity_per_inch24
part_name_assigned_by_controlling_agencyHEX NUT
NSN5325-00-200-5460
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: M641 · 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
•
OUTSIDE DIAMETER: 0.627 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 1060
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 1060 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: STRAIGHT GAP
•
USAGE DESIGN: EXTERNAL
•
MAJOR THICKNESS: 0.057 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.627 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1060
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 1060 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESTRAIGHT GAP
USAGE DESIGNEXTERNAL
MAJOR THICKNESS0.057 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
INSIDE DIAMETER0.382 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
END STYLEVERTEX BELOW CENTER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
AN515C-8-12Interchangeable
interchangeable cross-reference
interchangeable
112-0782-047Interchangeable
interchangeable cross-reference
interchangeable
0453-279Interchangeable
interchangeable cross-reference
interchangeable
835123Interchangeable
interchangeable cross-reference
interchangeable
91947Interchangeable
interchangeable cross-reference
interchangeable
M-6-4-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M641?
M641 is a NUT,PLAIN,HEXAGON.
What parts can replace M641?
There are 8 known substitutes for M641: AN515C-8-12, 112-0782-047, 0453-279 and 5 more. Substitute compatibility should be verified for your specific system.
Is M641 still available?
M641 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026