PartsTable
Technical Data Sheet
Download PDF

CHT4020-3-8AY — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

CHT4020-3-8AY: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, head_height: 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.3765 INCHES MINIMUM AND 0.3813 INCHES MAXIMUM IN, thread_length: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-285-7725, 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
CHT4020-3-8AY
NSN: 5305-01-285-7725
FSC: 5305 — Screws
CAGE: 17419 — DEUTSCH CO THE (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
head_height0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.3765 INCHES MINIMUM AND 0.3813 INCHES MAXIMUM IN
thread_length0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
shoulder_length0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
features_providedDRY FILM LUBRICANT AND O RING
NSN5305-01-285-7725
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: CHT4020-3-8AY · 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
•
HEAD HEIGHT: 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
FASTENER LENGTH0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
SHOULDER LENGTH0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
FEATURES PROVIDEDDRY FILM LUBRICANT AND O RING
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
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 2
HT4020-3-8AYSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3M902C3-8ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy CHT4020-3-8AY?
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 CHT4020-3-8AY?
CHT4020-3-8AY is a SCREW,SHOULDER.
What parts can replace CHT4020-3-8AY?
There are 2 known substitutes for CHT4020-3-8AY: HT4020-3-8AY, 3M902C3-8A. Substitute compatibility should be verified for your specific system.
What is the NSN for CHT4020-3-8AY?
CHT4020-3-8AY is cataloged in the U.S. Government catalog under NSN 5305-01-285-7725. 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 — CHT4020-3-8AY

✓ 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.