PartsTable
Technical Data Sheet
15X521 ✓ 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: 0.134 INCHES MINIMUM AND 0.148 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.334 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN, thread_length: 0.667 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, fastener_length: 0.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-579-5808, 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
15X521
NSN: 5305-00-579-5808
FSC: 5305
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.134 INCHES MINIMUM AND 0.148 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.334 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
thread_length0.667 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
fastener_length0.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.216 INCHES IN
minimum_tensile_strength60000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch24
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-579-5808
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 15X521 · 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
THREAD CLASS: 2A A
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
THREAD LENGTH: 0.667 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER: 0.216 INCHES IN
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 4S STYLE
THREAD QUANTITY PER INCH: 24
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFILLISTER
THREAD CLASS2A A
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD LENGTH0.667 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.216 INCHES IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 4S STYLE
THREAD QUANTITY PER INCH24
MINIMUM TENSILE STRENGTH60000 POUNDS PER SQUARE INCH LBS
HEAD DIAMETER0.334 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
100673Interchangeable
interchangeable cross-reference
interchangeable
S1207Interchangeable
interchangeable cross-reference
interchangeable
MILS933TYPEDInterchangeable
interchangeable cross-reference
interchangeable
FFS92TYPE1STYLE4SInterchangeable
interchangeable cross-reference
interchangeable
117585Interchangeable
interchangeable cross-reference
interchangeable
A106-8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 15X521?
15X521 is a SCREW,MACHINE.
What parts can replace 15X521?
There are 18 known substitutes for 15X521: 100673, S1207, MILS933TYPED and 15 more. Substitute compatibility should be verified for your specific system.
Is 15X521 still available?
15X521 is currently cancelled.
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