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Technical Data Sheet
PartsTable / COMPONENT / B18.24
B18.24 ✓ 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 B18.24 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-066-8173, 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
B18.24
NSN: 5305-00-066-8173
FSC: 5305
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
Part NumberB18.24
NSN5305-00-066-8173
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B18.24 · 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
•
MINIMUM TENSILE STRENGTH: 150000 POUNDS PER SQUARE INCH LBS
•
FASTENER LENGTH: 4.812 INCHES MINIMUM AND 5.000 INCHES MAXIMUM IN
•
THREAD LENGTH: 2.750 INCHES MINIMUM AND 2.938 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 GR8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD QUANTITY PER INCH: 12
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10P STYLE AND 8 GRADE
TECHNICAL CHARACTERISTICS (FLIS)
MINIMUM TENSILE STRENGTH150000 POUNDS PER SQUARE INCH LBS
FASTENER LENGTH4.812 INCHES MINIMUM AND 5.000 INCHES MAXIMUM IN
THREAD LENGTH2.750 INCHES MINIMUM AND 2.938 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE J429 GR8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
THREAD QUANTITY PER INCH12
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE AND 8 GRADE
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.749 INCHES MINIMUM AND 0.813 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
FF-S-85Interchangeable
Same NIIN cross-reference
interchangeable
5305000668173Interchangeable
Same NIIN cross-reference
interchangeable
MS90727-281Interchangeable
Same NIIN cross-reference
interchangeable
B1821BH125F500NInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B18.24?
B18.24 is a B18.24.
What parts can replace B18.24?
There are 4 known substitutes for B18.24: FF-S-85, 5305000668173, MS90727-281 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B18.24?
B18.24 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-066-8173. 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