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Technical Data Sheet
PartsTable / COMPONENT / 8117ITEM21
8117ITEM21 ✓ 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, head_height: 0.203 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.438 INCHES NOMINAL IN, thread_length: 0.375 INCHES MINIMUM IN, screw_material: COPPER ALLOY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-208-0042, 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
8117ITEM21
NSN: 5305-00-208-0042
FSC: 5305
CAGE: 33409 — A. O. SMITH CORPORATION DBA A O SMITH CORP (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.203 INCHES NOMINAL IN
thread_class3A A
head_diameter0.438 INCHES NOMINAL IN
thread_length0.375 INCHES MINIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.312 INCHES IN
thread_quantity_per_inch24
thread_series_designatorUNF
NSN5305-00-208-0042
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8117ITEM21 · 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
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD LENGTH: 0.375 INCHES MINIMUM IN
•
HEAD STYLE: FILLISTER
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 24
•
THREAD CLASS: 3A A
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
FASTENER LENGTH: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF
THREAD LENGTH0.375 INCHES MINIMUM IN
HEAD STYLEFILLISTER
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH24
THREAD CLASS3A A
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
FASTENER LENGTH0.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
SCREW MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
00606296002539Interchangeable
interchangeable cross-reference
interchangeable
A1439Interchangeable
interchangeable cross-reference
interchangeable
1439Interchangeable
interchangeable cross-reference
interchangeable
FF-B-187 REV BInterchangeable
interchangeable cross-reference
interchangeable
316-572B3-4Interchangeable
interchangeable cross-reference
interchangeable
11640528Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8117ITEM21?
8117ITEM21 is a SCREW,MACHINE.
What parts can replace 8117ITEM21?
There are 19 known substitutes for 8117ITEM21: 00606296002539, A1439, 1439 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8117ITEM21?
8117ITEM21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-208-0042. 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