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J643P08B — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

J643P08B: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, hole_type: DRILLED, head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.248 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN, thread_class: 3A A, hole_diameter: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-188-9175, 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
J643P08B
NSN: 5306-01-188-9175
FSC: 5306 — Bolts
CAGE: 07482 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
hole_typeDRILLED
head_styleDOUBLE HEXAGON W/HOLE
head_height0.248 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
thread_class3A A
hole_diameter0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
hole_quantity2
thread_length0.616 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES THREADS
fastener_length0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
NSN5306-01-188-9175
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: J643P08B · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
EXTENDED WASHER THICKNESS: 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.248 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.616 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
•
HOLE CONFIGURATION STYLE: DOUBLE HEXAGON FLATS
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
EXTENDED WASHER THICKNESS0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
HEAD HEIGHT0.248 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
FASTENER LENGTH0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
THREAD LENGTH0.616 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
HOLE CONFIGURATION STYLEDOUBLE HEXAGON FLATS
NOMINAL THREAD DIAMETER0.190 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 1
5306PL1498282Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is J643P08B?
J643P08B is a BOLT,MACHINE.
What parts can replace J643P08B?
There is 1 known substitute for J643P08B: 5306PL1498282. Substitute compatibility should be verified for your specific system.
What is the NSN for J643P08B?
J643P08B is cataloged in the U.S. Government catalog under NSN 5306-01-188-9175. 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.