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Technical Data Sheet
PartsTable / COMPONENT / ASME B18.2.1
ASME B18.2.1 ✓ 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 ASME B18.2.1 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-022-3843, 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
ASME B18.2.1
NSN: 5305-00-022-3843
FSC: 5305
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
Part NumberASME B18.2.1
NSN5305-00-022-3843
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ASME B18.2.1 · 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
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD DIAMETER: 0.875 INCHES IN
•
MINIMUM TENSILE STRENGTH: 150000 POUNDS PER SQUARE INCH LBS
•
THREAD QUANTITY PER INCH: 14
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD LENGTH: 2.000 INCHES MINIMUM AND 2.188 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
NOMINAL THREAD DIAMETER0.875 INCHES IN
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
MINIMUM TENSILE STRENGTH150000 POUNDS PER SQUARE INCH LBS
THREAD QUANTITY PER INCH14
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE J429 GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD LENGTH2.000 INCHES MINIMUM AND 2.188 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 TY 2 SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTZINC AND CHROMATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
8438865Interchangeable
Same NIIN cross-reference
interchangeable
B1821BH088F250NInterchangeable
Same NIIN cross-reference
interchangeable
5305000223843Interchangeable
Same NIIN cross-reference
interchangeable
MS90726-211Interchangeable
Same NIIN cross-reference
interchangeable
MS90727-211Interchangeable
Same NIIN cross-reference
interchangeable
FF-S-85Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ASME B18.2.1?
ASME B18.2.1 is a ASME B18.2.1.
What parts can replace ASME B18.2.1?
There are 6 known substitutes for ASME B18.2.1: 8438865, B1821BH088F250N, 5305000223843 and 3 more. Substitute compatibility should be verified for your specific system.
Is ASME B18.2.1 still available?
ASME B18.2.1 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