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PartsTable / COMPONENT / ANSI B18.2.1
ANSI 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 ANSI B18.2.1 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-145-1064, 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
ANSI B18.2.1
NSN: 5305-00-145-1064
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberANSI B18.2.1
NSN5305-00-145-1064
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ANSI 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
•
SHOULDER DIAMETER: 0.360 INCHES MINIMUM AND 0.388 INCHES MAXIMUM FIRST SHOULDER IN
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
WIDTH BETWEEN FLATS: 0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.125 INCHES MINIMUM FIRST SHOULDER IN
•
FASTENER LENGTH: 3.000 INCHES NOMINAL IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HEAD STYLE: HEXAGON
•
HEAD HEIGHT: 0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER DIAMETER0.360 INCHES MINIMUM AND 0.388 INCHES MAXIMUM FIRST SHOULDER IN
NONMACHINE NOMINAL THREAD DIAMETER0.375 INCHES IN
WIDTH BETWEEN FLATS0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
SHOULDER LENGTH0.125 INCHES MINIMUM FIRST SHOULDER IN
FASTENER LENGTH3.000 INCHES NOMINAL IN
SHOULDER SHAPEROUND FIRST SHOULDER
HEAD STYLEHEXAGON
HEAD HEIGHT0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
HARDNESS RATING60.0 ROCKWELL B MINIMUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
FF-B-561 TY1ST1GRBInterchangeable
interchangeable cross-reference
interchangeable
1062Interchangeable
interchangeable cross-reference
interchangeable
ANSI B18.2.1Interchangeable
interchangeable cross-reference
interchangeable
FF-B-561Interchangeable
interchangeable cross-reference
interchangeable
1050Interchangeable
interchangeable cross-reference
interchangeable
1065Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ANSI B18.2.1?
ANSI B18.2.1 is a ANSI B18.2.1.
What parts can replace ANSI B18.2.1?
There are 22 known substitutes for ANSI B18.2.1: FF-B-561 TY1ST1GRB, 1062, ANSI B18.2.1 and 19 more. Substitute compatibility should be verified for your specific system.
Is ANSI B18.2.1 still available?
ANSI 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