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BACB30LJ7DU21 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACB30LJ7DU21: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: UNDERCUT HEXAGON, grip_length: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN, head_height: 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-040-8709, 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
BACB30LJ7DU21
NSN: 5306-01-040-8709
FSC: 5306 — Bolts
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleUNDERCUT HEXAGON
grip_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN
head_height0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
thread_length0.516 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES BEARING SURFACE OF HEAD
fastener_length1.838 INCHES MINIMUM AND 1.868 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_between_flats0.679 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
NSN5306-01-040-8709
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACB30LJ7DU21 · 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
•
HEAD HEIGHT: 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.838 INCHES MINIMUM AND 1.868 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.516 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN
•
NOMINAL THREAD DIAMETER: 0.438 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD HEIGHT0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
FASTENER LENGTH1.838 INCHES MINIMUM AND 1.868 INCHES MAXIMUM IN
THREAD LENGTH0.516 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN
NOMINAL THREAD DIAMETER0.438 INCHES IN
HEAD STYLEUNDERCUT HEXAGON
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
BACBN30LJ7DU21Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 BACB30LJ7DU21?
BACB30LJ7DU21 is a BOLT,CLOSE TOLERANCE.
What parts can replace BACB30LJ7DU21?
There is 1 known substitute for BACB30LJ7DU21: BACBN30LJ7DU21. Substitute compatibility should be verified for your specific system.
What is the NSN for BACB30LJ7DU21?
BACB30LJ7DU21 is cataloged in the U.S. Government catalog under NSN 5306-01-040-8709. 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.