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J643P18B — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

J643P18B: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.047 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.638 INCHES NOMINAL IN, fastener_length: 1.312 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-469-3052, 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
J643P18B
NSN: 5306-01-469-3052
FSC: 5306 — Bolts
CAGE: 07482 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.047 INCHES NOMINAL IN
thread_class3A A
thread_length0.638 INCHES NOMINAL IN
fastener_length1.312 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.950 INCHES NOMINAL IN
nominal_thread_diameter0.190 INCHES IN
extended_washer_diameter0.375 INCHES NOMINAL IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF)
extended_washer_thickness0.045 INCHES NOMINAL IN
NSN5306-01-469-3052
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: J643P18B · 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
•
EXTENDED WASHER THICKNESS: 0.045 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.047 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.312 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.375 INCHES NOMINAL IN
•
THREAD LENGTH: 0.638 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON EXTENDED WASHER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.045 INCHES NOMINAL IN
HEAD HEIGHT0.047 INCHES NOMINAL IN
FASTENER LENGTH1.312 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.375 INCHES NOMINAL IN
THREAD LENGTH0.638 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEDOUBLE HEXAGON EXTENDED WASHER
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.950 INCHES NOMINAL IN
THREAD CLASS3A A
SUBSTITUTES & CROSS-REFERENCES 1
J641-J649Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is J643P18B?
J643P18B is a BOLT,MACHINE.
What parts can replace J643P18B?
There is 1 known substitute for J643P18B: J641-J649. Substitute compatibility should be verified for your specific system.
What is the NSN for J643P18B?
J643P18B is cataloged in the U.S. Government catalog under NSN 5306-01-469-3052. 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.