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4180521 — SETSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4180521: SETSCREW.

The SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEADLESS (SETSCREW), key_length: 0.188 INCHES MINIMUM IN, point_style: CUP, thread_class: 3A A, point_diameter: 0.194 INCHES MINIMUM AND 0.212 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-658-9700, 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
4180521
NSN: 5305-01-658-9700
FSC: 5305 — Screws
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEADLESS (SETSCREW)
key_length0.188 INCHES MINIMUM IN
point_styleCUP
thread_class3A A
point_diameter0.194 INCHES MINIMUM AND 0.212 INCHES MAXIMUM IN
fastener_length1.00 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE ZINC OVERALL
width_across_flats0.1875 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN
point_chamfer_angle118.0 DEGREES NOMINAL
internal_drive_styleHEXAGON
NSN5305-01-658-9700
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4180521 · 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
•
POINT DIAMETER: 0.194 INCHES MINIMUM AND 0.212 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.1875 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.00 INCHES NOMINAL IN
•
POINT CHAMFER ANGLE: 118.0 DEGREES NOMINAL
•
NOMINAL THREAD DIAMETER: 0.38 INCHES IN
•
HEAD STYLE: HEADLESS (SETSCREW)
•
THREAD DIRECTION: RIGHT-HAND
•
POINT STYLE: CUP
TECHNICAL CHARACTERISTICS
POINT DIAMETER0.194 INCHES MINIMUM AND 0.212 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.1875 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN
FASTENER LENGTH1.00 INCHES NOMINAL IN
POINT CHAMFER ANGLE118.0 DEGREES NOMINAL
NOMINAL THREAD DIAMETER0.38 INCHES IN
HEAD STYLEHEADLESS (SETSCREW)
THREAD DIRECTIONRIGHT-HAND
POINT STYLECUP
KEY LENGTH0.188 INCHES MINIMUM IN
COLORBLACK OVERALL
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4180521?
4180521 is a SETSCREW.
What is the NSN for 4180521?
4180521 is cataloged in the U.S. Government catalog under NSN 5305-01-658-9700. 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.