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MB249-14D40 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MB249-14D40: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R56400 OVERALL, head_style: HEXAGON, grip_length: 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN, head_height: 0.438 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.8735 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-293-5325, 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
MB249-14D40
NSN: 5306-01-293-5325
FSC: 5306 — Bolts
CAGE: L4528 — LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC (CAN)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 OVERALL
head_styleHEXAGON
grip_length2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN
head_height0.438 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.8735 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM IN
thread_length0.632 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES GRIP
fastener_length3.142 INCHES MINIMUM AND 3.162 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats1.239 INCHES MINIMUM AND 1.252 INCHES MAXIMUM IN
nominal_thread_diameter0.875 INCHES IN
NSN5306-01-293-5325
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MB249-14D40 · 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: 63.0 MICROINCHES GRIP
•
HEAD HEIGHT: 0.438 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.142 INCHES MINIMUM AND 3.162 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.632 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM ALL HOLES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.875 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD HEIGHT0.438 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
FASTENER LENGTH3.142 INCHES MINIMUM AND 3.162 INCHES MAXIMUM IN
THREAD LENGTH0.632 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM ALL HOLES IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.875 INCHES IN
HEAD STYLEHEXAGON
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 3
3M892-14D40Reference document
Same NSN cross-reference
Reference document — Secondary reference
111053-14D40Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10116209Reference 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 MB249-14D40?
MB249-14D40 is a BOLT,CLOSE TOLERANCE.
What parts can replace MB249-14D40?
There are 3 known substitutes for MB249-14D40: 3M892-14D40, 111053-14D40, 10116209. Substitute compatibility should be verified for your specific system.
What is the NSN for MB249-14D40?
MB249-14D40 is cataloged in the U.S. Government catalog under NSN 5306-01-293-5325. 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.