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J644P12B — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

J644P12B: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, hole_type: DRILLED, head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_class: 3A A, hole_diameter: 0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-262-5410, 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
J644P12B
NSN: 5306-01-262-5410
FSC: 5306 — Bolts
CAGE: 07482 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
hole_typeDRILLED
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_class3A A
hole_diameter0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
hole_quantity2
thread_length0.750 INCHES NOMINAL IN
fastener_length0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.312 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
NSN5306-01-262-5410
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: J644P12B · 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: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
HOLE CONFIGURATION STYLE: DOUBLE HEXAGON FLATS
•
FIRST DIAMETER FROM HEAD: 0.222 INCHES MINIMUM AND 0.232 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
HEAD HEIGHT0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
FASTENER LENGTH0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES NOMINAL IN
HOLE CONFIGURATION STYLEDOUBLE HEXAGON FLATS
FIRST DIAMETER FROM HEAD0.222 INCHES MINIMUM AND 0.232 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDOUBLE HEXAGON EXTENDED WASHER
THREAD DIRECTIONRIGHT-HAND
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
J644P12BQQSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 J644P12B?
J644P12B is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace J644P12B?
There is 1 known substitute for J644P12B: J644P12BQQ. Substitute compatibility should be verified for your specific system.
What is the NSN for J644P12B?
J644P12B is cataloged in the U.S. Government catalog under NSN 5306-01-262-5410. 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.