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Technical Data Sheet
PartsTable / COMPONENT / B18.6.4
B18.6.4 ✓ 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 B18.6.4 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-879-7941, 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
B18.6.4
NSN: 5305-00-879-7941
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberB18.6.4
NSN5305-00-879-7941
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B18.6.4 · 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
•
HEAD STYLE: PAN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
HEAD HEIGHT: 0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
MATERIAL: STEEL OVERALL
•
NONDEFINITIVE SPEC/STD DATA: AB TYPE
•
SURFACE TREATMENT: ZINC OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633 ASSN STD ALL TREATMENT RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEPAN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
HEAD HEIGHT0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER0.190 INCHES IN
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATAAB TYPE
SURFACE TREATMENTZINC OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 ASSN STD ALL TREATMENT RESPONSES OVERALL
HEAD DIAMETER0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
FASTENER LENGTH0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
NASM51861Interchangeable
interchangeable cross-reference
interchangeable
80105Interchangeable
interchangeable cross-reference
interchangeable
MS24617-55Interchangeable
interchangeable cross-reference
interchangeable
92662Interchangeable
interchangeable cross-reference
interchangeable
92733Interchangeable
interchangeable cross-reference
interchangeable
FF-S-107 TYABInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B18.6.4?
B18.6.4 is a B18.6.4.
What parts can replace B18.6.4?
There are 32 known substitutes for B18.6.4: NASM51861, 80105, MS24617-55 and 29 more. Substitute compatibility should be verified for your specific system.
Is B18.6.4 still available?
B18.6.4 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