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PartsTable / COMPONENT / BB17973
BB17973 ✓ 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 SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FILLISTER EXTENDED WASHER, head_height: 0.437 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.300 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN, thread_length: 0.219 INCHES MINIMUM IN, screw_material: STEEL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-206-4559, 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
BB17973
NSN: 5305-00-206-4559
FSC: 5305
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
head_styleFILLISTER EXTENDED WASHER
head_height0.437 INCHES NOMINAL IN
thread_class2A A
head_diameter0.300 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN
thread_length0.219 INCHES MINIMUM IN
screw_materialSTEEL
fastener_length0.297 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter0.190 INCHES IN
thread_quantity_per_inch24
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-206-4559
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BB17973 · 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: FILLISTER EXTENDED WASHER
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD DIAMETER: 0.300 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
•
THREAD CLASS: 2A A
•
FASTENER LENGTH: 0.297 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFILLISTER EXTENDED WASHER
NOMINAL THREAD DIAMETER0.190 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD DIAMETER0.300 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
THREAD CLASS2A A
FASTENER LENGTH0.297 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.219 INCHES MINIMUM IN
THREAD QUANTITY PER INCH24
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
BACN10JB3Interchangeable
interchangeable cross-reference
interchangeable
F171-3Interchangeable
interchangeable cross-reference
interchangeable
4942Interchangeable
interchangeable cross-reference
interchangeable
6550FInterchangeable
interchangeable cross-reference
interchangeable
J1250Interchangeable
interchangeable cross-reference
interchangeable
55452Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BB17973?
BB17973 is a SCREW,MACHINE.
What parts can replace BB17973?
There are 21 known substitutes for BB17973: BACN10JB3, F171-3, 4942 and 18 more. Substitute compatibility should be verified for your specific system.
Is BB17973 still available?
BB17973 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