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HT4020-6-23 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT4020-6-23: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 1.4275 INCHES MINIMUM AND 1.4475 INCHES MAXIMUM IN, head_height: 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN, head_diameter: 0.7556 INCHES MINIMUM AND 0.7604 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-494-8586, 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
HT4020-6-23
NSN: 5305-01-494-8586
FSC: 5305 — Screws
CAGE: 17446 — HUCK INTERNATIONAL, INC (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length1.4275 INCHES MINIMUM AND 1.4475 INCHES MAXIMUM IN
head_height0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
head_diameter0.7556 INCHES MINIMUM AND 0.7604 INCHES MAXIMUM IN
thread_length0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
fastener_length1.2970 INCHES MINIMUM AND 2.1195 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleHIGH-TORQUE
nominal_thread_diameter0.3750 INCHES IN
thread_quantity_per_inch24
NSN5305-01-494-8586
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT4020-6-23 · 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: 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.2970 INCHES MINIMUM AND 2.1195 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.3750 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 1.4275 INCHES MINIMUM AND 1.4475 INCHES MAXIMUM IN
•
GRIP DIAMETER: 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN
FASTENER LENGTH1.2970 INCHES MINIMUM AND 2.1195 INCHES MAXIMUM IN
THREAD LENGTH0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.3750 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.4275 INCHES MINIMUM AND 1.4475 INCHES MAXIMUM IN
GRIP DIAMETER0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
INTERNAL DRIVE STYLEHIGH-TORQUE
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
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 1
ST3M652C6-23DSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 HT4020-6-23?
HT4020-6-23 is a SCREW,CLOSE TOLERANCE.
What parts can replace HT4020-6-23?
There is 1 known substitute for HT4020-6-23: ST3M652C6-23D. Substitute compatibility should be verified for your specific system.
What is the NSN for HT4020-6-23?
HT4020-6-23 is cataloged in the U.S. Government catalog under NSN 5305-01-494-8586. 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.