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Technical Data Sheet
PartsTable / COMPONENT / ANSI B18.6.1
ANSI B18.6.1 ✓ 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 B18.6.1 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 5305-00-010-1944, 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 B18.6.1
NSN: 5305-00-010-1944
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberANSI B18.6.1
NSN5305-00-010-1944
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ANSI B18.6.1 · 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
•
HEAD STYLE: FLAT COUNTERSUNK
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2S STYLE
•
FASTENER LENGTH: 1.203 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
INTERNAL DRIVE STYLE: SLOT
•
HEAD DIAMETER: 0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
NONMACHINE THREAD STYLE: WOOD SCREW (TYPE WD)
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.216 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFLAT COUNTERSUNK
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2S STYLE
FASTENER LENGTH1.203 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
INTERNAL DRIVE STYLESLOT
HEAD DIAMETER0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
NONMACHINE THREAD STYLEWOOD SCREW (TYPE WD)
NONMACHINE NOMINAL THREAD DIAMETER0.216 INCHES IN
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
FF-S-111 TY1ST2SInterchangeable
interchangeable cross-reference
interchangeable
FF-S-111Interchangeable
interchangeable cross-reference
interchangeable
ANSI B18.6.1Interchangeable
interchangeable cross-reference
interchangeable
101909Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ANSI B18.6.1?
ANSI B18.6.1 is a ANSI B18.6.1.
What parts can replace ANSI B18.6.1?
There are 4 known substitutes for ANSI B18.6.1: FF-S-111 TY1ST2S, FF-S-111, ANSI B18.6.1 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ANSI B18.6.1?
ANSI B18.6.1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-010-1944. 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