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PartsTable / COMPONENT / B1821BH031F450N
B1821BH031F450N ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.875 INCHES MINIMUM IN, fastener_length: 4.406 INCHES MINIMUM AND 4.500 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-051-4092, 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
B1821BH031F450N
NSN: 5306-00-051-4092
FSC: 5306
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
thread_class2A A
thread_length0.875 INCHES MINIMUM IN
fastener_length4.406 INCHES MINIMUM AND 4.500 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentZINC AND CHROMATE OVERALL
width_between_flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
end_item_identificationMRAP BUFFALO MK2A2
NSN5306-00-051-4092
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B1821BH031F450N · 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
•
THREAD QUANTITY PER INCH: 24
•
MINIMUM TENSILE STRENGTH: 8700 POUNDS PER SQUARE INCH LBS
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
FEATURES PROVIDED: FINISHED HEAD
•
HEAD STYLE: HEXAGON
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
THREAD QUANTITY PER INCH24
MINIMUM TENSILE STRENGTH8700 POUNDS PER SQUARE INCH LBS
NOMINAL THREAD DIAMETER0.312 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
HEAD STYLEHEXAGON
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
SURFACE TREATMENTZINC AND CHROMATE OVERALL
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
FFS85Upgraded Successor
successor cross-reference
successor
186274Upgraded Successor
successor cross-reference
successor
MS90725-52Upgraded Successor
successor cross-reference
successor
0251428Upgraded Successor
successor cross-reference
successor
MS90726-40Upgraded Successor
successor cross-reference
successor
301551Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1821BH031F450N?
B1821BH031F450N is a BOLT,MACHINE.
What parts can replace B1821BH031F450N?
There are 21 known substitutes for B1821BH031F450N: FFS85, 186274, MS90725-52 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B1821BH031F450N?
B1821BH031F450N is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-051-4092. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026