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398D4 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

398D4: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN, fastener_length: 6.802 INCHES MINIMUM AND 6.822 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-753-4969, 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
398D4
NSN: 5306-00-753-4969
FSC: 5306 — Bolts
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
thread_class2A A
thread_length3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
fastener_length6.802 INCHES MINIMUM AND 6.822 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
width_between_flats1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM IN
nominal_thread_diameter1.250 INCHES IN
thread_quantity_per_inch12
thread_series_designatorUNF
NSN5306-00-753-4969
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 398D4 · 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: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
FASTENER LENGTH: 6.802 INCHES MINIMUM AND 6.822 INCHES MAXIMUM IN
•
THREAD LENGTH: 3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 1.250 INCHES IN
•
FEATURES PROVIDED: FINISHED HEAD
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
FASTENER LENGTH6.802 INCHES MINIMUM AND 6.822 INCHES MAXIMUM IN
THREAD LENGTH3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER1.250 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM IN
THREAD CLASS2A A
THREAD QUANTITY PER INCH12
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES 3
BB26009Reference document
Same NSN cross-reference
Reference document — Secondary reference
243690Reference document
Same NSN cross-reference
Reference document — Secondary reference
361274Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 398D4?
398D4 is a BOLT,MACHINE.
What parts can replace 398D4?
There are 3 known substitutes for 398D4: BB26009, 243690, 361274. Substitute compatibility should be verified for your specific system.
What is the NSN for 398D4?
398D4 is cataloged in the U.S. Government catalog under NSN 5306-00-753-4969. 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.