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3C3578P11 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

3C3578P11: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OVERALL, head_style: FLAT CHAMFER, head_height: 0.306 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.457 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN, thread_length: 0.139 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-274-1263, 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
3C3578P11
NSN: 5305-01-274-1263
FSC: 5305 — Screws
CAGE: 07482 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OVERALL
head_styleFLAT CHAMFER
head_height0.306 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.457 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
thread_length0.139 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
fastener_length0.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentOXIDE OVERALL
width_across_flats0.250 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.312 INCHES IN
NSN5305-01-274-1263
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3C3578P11 · 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
•
WIDTH ACROSS FLATS: 0.250 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.306 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.139 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.250 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
HEAD HEIGHT0.306 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
FASTENER LENGTH0.250 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.139 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 ASSN STD ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
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 3C3578P11?
3C3578P11 is a SCREW,CAP,SOCKET HEAD.
What is the NSN for 3C3578P11?
3C3578P11 is cataloged in the U.S. Government catalog under NSN 5305-01-274-1263. 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.