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Technical Data Sheet
PartsTable / COMPONENT / 508859
508859 ✓ 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,TAPPING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: FLAT COUNTERSUNK, head_diameter: 9.5 MILLIMETERS NOMINAL MM, fastener_length: 12.0 MILLIMETERS NOMINAL MM, countersink_angle: 80.0 DEGREES NOMINAL, internal_drive_style: SLOT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-384-1723, 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
508859
NSN: 5305-01-384-1723
FSC: 5305
CAGE: 71871 — ALFA LAVAL INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleFLAT COUNTERSUNK
head_diameter9.5 MILLIMETERS NOMINAL MM
fastener_length12.0 MILLIMETERS NOMINAL MM
countersink_angle80.0 DEGREES NOMINAL
internal_drive_styleSLOT
nonmachine_thread_styleTHRU SLOT (TYPE 6)
nonmachine_nominal_thread_diameter0.250 INCHES IN
NSN5305-01-384-1723
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 508859 · 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
•
INTERNAL DRIVE STYLE: SLOT
•
HEAD DIAMETER: 9.5 MILLIMETERS NOMINAL MM
•
COUNTERSINK ANGLE: 80.0 DEGREES NOMINAL
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
FASTENER LENGTH: 12.0 MILLIMETERS NOMINAL MM
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
NONMACHINE THREAD STYLE: THRU SLOT (TYPE 6)
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL DRIVE STYLESLOT
HEAD DIAMETER9.5 MILLIMETERS NOMINAL MM
COUNTERSINK ANGLE80.0 DEGREES NOMINAL
NONMACHINE NOMINAL THREAD DIAMETER0.250 INCHES IN
FASTENER LENGTH12.0 MILLIMETERS NOMINAL MM
MATERIALSTEEL CORROSION RESISTING OVERALL
NONMACHINE THREAD STYLETHRU SLOT (TYPE 6)
HEAD STYLEFLAT COUNTERSUNK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
WC40333Interchangeable
interchangeable cross-reference
interchangeable
37231Interchangeable
interchangeable cross-reference
interchangeable
834-1FInterchangeable
interchangeable cross-reference
interchangeable
834-1Interchangeable
interchangeable cross-reference
interchangeable
795-1DInterchangeable
interchangeable cross-reference
interchangeable
81900SDInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 508859?
508859 is a SCREW,TAPPING.
What parts can replace 508859?
There are 19 known substitutes for 508859: WC40333, 37231, 834-1F and 16 more. Substitute compatibility should be verified for your specific system.
Is 508859 still available?
508859 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