PartsTable
Technical Data Sheet
Download PDF

HT409A4-7 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT409A4-7: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-385-4741, 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
HT409A4-7
NSN: 5305-00-385-4741
FSC: 5305 — Screws
CAGE: 06950 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
shoulder_length0.327 INCHES MINIMUM AND 0.349 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresFURNISHED WITH ONE O-RING
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
shoulder_diameter0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-00-385-4741
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT409A4-7 · 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: 0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.327 INCHES MINIMUM AND 0.349 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
SHOULDER LENGTH0.327 INCHES MINIMUM AND 0.349 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SPECIAL FEATURESFURNISHED WITH ONE O-RING
INTERNAL DRIVE STYLEHIGH-TORQUE
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES 3
3M50-4-7Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
HT41UA7Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
54267-4-7Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
Ready to buy HT409A4-7?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is HT409A4-7?
HT409A4-7 is a SCREW,SHOULDER.
What parts can replace HT409A4-7?
There are 3 known substitutes for HT409A4-7: 3M50-4-7, HT41UA7, 54267-4-7. Substitute compatibility should be verified for your specific system.
What is the NSN for HT409A4-7?
HT409A4-7 is cataloged in the U.S. Government catalog under NSN 5305-00-385-4741. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — HT409A4-7

✓ 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.