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16990L-6C-16 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

16990L-6C-16: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: COUNTERSUNK CYLINDRICAL CONVEX, thread_class: 3A A, thread_direction: RIGHT-HAND, width_across_flats: 0.218 INCHES NOMINAL IN, head_major_diameter: 0.720 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-330-4454, 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
16990L-6C-16
NSN: 5305-01-330-4454
FSC: 5305 — Screws
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleCOUNTERSUNK CYLINDRICAL CONVEX
thread_class3A A
thread_directionRIGHT-HAND
width_across_flats0.218 INCHES NOMINAL IN
head_major_diameter0.720 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.375 INCHES IN
thread_quantity_per_inch16
thread_series_designatorUNRC
NSN5305-01-330-4454
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 16990L-6C-16 · 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: 0.218 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: COUNTERSUNK CYLINDRICAL CONVEX
•
THREAD DIRECTION: RIGHT-HAND
•
INTERNAL DRIVE STYLE: HEXAGON
•
THREAD CLASS: 3A A
•
THREAD QUANTITY PER INCH: 16
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.218 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLECOUNTERSUNK CYLINDRICAL CONVEX
THREAD DIRECTIONRIGHT-HAND
INTERNAL DRIVE STYLEHEXAGON
THREAD CLASS3A A
THREAD QUANTITY PER INCH16
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNRC
HEAD MAJOR DIAMETER0.720 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
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 16990L-6C-16?
16990L-6C-16 is a SCREW,CAP,SOCKET HEAD.
What is the NSN for 16990L-6C-16?
16990L-6C-16 is cataloged in the U.S. Government catalog under NSN 5305-01-330-4454. 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.