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Technical Data Sheet
PartsTable / COMPONENT / ANSI 18.6.1
ANSI 18.6.1 ✓ 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 18.6.1 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-901-3127, 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 18.6.1
NSN: 5305-00-901-3127
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberANSI 18.6.1
NSN5305-00-901-3127
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ANSI 18.6.1 · 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
•
FASTENER LENGTH: 1.688 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
•
NONMACHINE THREAD STYLE: GIMLET POINT (TYPE A, AB OR BA)
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
HEAD DIAMETER: 0.340 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.688 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
HEAD DIAMETER0.340 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
SPECIAL FEATURESMATERIAL - BRASS ALLOY
NONMACHINE NOMINAL THREAD DIAMETER0.190 INCHES IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
ANSI B18.6.1Interchangeable
interchangeable cross-reference
interchangeable
FF-S-111 TY1ST2CInterchangeable
interchangeable cross-reference
interchangeable
MS35492-80Interchangeable
interchangeable cross-reference
interchangeable
149367Interchangeable
interchangeable cross-reference
interchangeable
FF-S-111Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-971Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ANSI 18.6.1?
ANSI 18.6.1 is a ANSI 18.6.1.
What parts can replace ANSI 18.6.1?
There are 20 known substitutes for ANSI 18.6.1: ANSI B18.6.1, FF-S-111 TY1ST2C, MS35492-80 and 17 more. Substitute compatibility should be verified for your specific system.
Is ANSI 18.6.1 still available?
ANSI 18.6.1 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