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138521-15 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

138521-15: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: PAN, thread_class: 2A A, thread_length: 0.375 INCHES NOMINAL IN, fastener_length: 0.375 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, internal_drive_style: CROSS RECESS TYPE II. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-075-9459, 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
138521-15
NSN: 5305-01-075-9459
FSC: 5305 — Screws
CAGE: 06481 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
head_stylePAN
thread_class2A A
thread_length0.375 INCHES NOMINAL IN
fastener_length0.375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE II
head_surface_treatmentCHROMATE ZINC AND ENAMEL LUSTERLESS
nominal_thread_diameter0.112 INCHES IN
thread_quantity_per_inch40
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-075-9459
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 138521-15 · 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
•
FASTENER LENGTH: 0.375 INCHES NOMINAL IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD SURFACE TREATMENT: CHROMATE ZINC AND ENAMEL LUSTERLESS
•
HEAD STYLE: PAN
•
THREAD DIRECTION: RIGHT-HAND
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE II
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.375 INCHES NOMINAL IN
THREAD LENGTH0.375 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD SURFACE TREATMENTCHROMATE ZINC AND ENAMEL LUSTERLESS
HEAD STYLEPAN
THREAD DIRECTIONRIGHT-HAND
INTERNAL DRIVE STYLECROSS RECESS TYPE II
THREAD CLASS2A A
THREAD QUANTITY PER INCH40
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 138521-15?
138521-15 is a SCREW,MACHINE.
What is the NSN for 138521-15?
138521-15 is cataloged in the U.S. Government catalog under NSN 5305-01-075-9459. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.