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PartsTable / COMPONENT / B1821BH056C300N
B1821BH056C300N ✓ 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 SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8640 OVERALL, head_style: HEXAGON, head_height: 0.359 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 2.832 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN, fastener_length: 3.000 INCHES NOMINAL 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 5305-01-255-7403, 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
B1821BH056C300N
NSN: 5305-01-255-7403
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
materialSTEEL COMP 8640 OVERALL
head_styleHEXAGON
head_height0.359 INCHES NOMINAL IN
thread_class2A A
thread_length2.832 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
fastener_length3.000 INCHES NOMINAL IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
special_featuresBLUE COATED
thread_directionRIGHT-HAND
surface_treatmentZINC AND DICHROMATE OVERALL
width_between_flats0.812 INCHES NOMINAL IN
nominal_thread_diameter0.562 INCHES IN
NSN5305-01-255-7403
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B1821BH056C300N · 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
•
WIDTH BETWEEN FLATS: 0.812 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.359 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.000 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 8640 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GRADE8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS0.812 INCHES NOMINAL IN
HEAD HEIGHT0.359 INCHES NOMINAL IN
FASTENER LENGTH3.000 INCHES NOMINAL IN
MATERIALSTEEL COMP 8640 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GRADE8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
SPECIAL FEATURESBLUE COATED
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTZINC AND DICHROMATE OVERALL
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
3673AInterchangeable
interchangeable cross-reference
interchangeable
860530Interchangeable
interchangeable cross-reference
interchangeable
74906137Interchangeable
interchangeable cross-reference
interchangeable
4906137-7Interchangeable
interchangeable cross-reference
interchangeable
4906137Interchangeable
interchangeable cross-reference
interchangeable
654304-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1821BH056C300N?
B1821BH056C300N is a SCREW,CAP,HEXAGON HEAD.
What parts can replace B1821BH056C300N?
There are 9 known substitutes for B1821BH056C300N: 3673A, 860530, 74906137 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B1821BH056C300N?
B1821BH056C300N is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-255-7403. 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