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Technical Data Sheet
PartsTable / COMPONENT / B1821BH031F300N
B1821BH031F300N ✓ 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: 2.906 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-051-4086, 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
B1821BH031F300N
NSN: 5306-00-051-4086
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_length2.906 INCHES MINIMUM AND 3.000 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
nominal_thread_diameter0.312 INCHES IN
NSN5306-00-051-4086
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B1821BH031F300N · 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
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
THREAD QUANTITY PER INCH: 24
•
THREAD CLASS: 2A A
•
HEAD STYLE: HEXAGON
•
FASTENER LENGTH: 2.906 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAEJ429GRADE8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.312 INCHES IN
THREAD QUANTITY PER INCH24
THREAD CLASS2A A
HEAD STYLEHEXAGON
FASTENER LENGTH2.906 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
SURFACE TREATMENTZINC AND CHROMATE OVERALL
THREAD SERIES DESIGNATORUNF
MATERIAL DOCUMENT AND CLASSIFICATIONSAEJ429GRADE8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
WIDTH BETWEEN FLATS0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
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
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1821BH031F300N?
B1821BH031F300N is a BOLT,MACHINE.
What parts can replace B1821BH031F300N?
There are 22 known substitutes for B1821BH031F300N: FFS85, 186274, MS90725-52 and 19 more. Substitute compatibility should be verified for your specific system.
Is B1821BH031F300N still available?
B1821BH031F300N is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026