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HT4020-5-19A — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT4020-5-19A: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 FASTENER, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 1.1775 INCHES MINIMUM AND 1.1975 INCHES MAXIMUM IN, head_height: 0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-477-5835, 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
HT4020-5-19A
NSN: 5305-01-477-5835
FSC: 5305 — Screws
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 FASTENER
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length1.1775 INCHES MINIMUM AND 1.1975 INCHES MAXIMUM IN
head_height0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN
head_diameter0.575 INCHES NOMINAL IN
thread_length0.531 INCHES NOMINAL IN
fastener_length1.7025 INCHES MINIMUM AND 1.7495 INCHES MAXIMUM IN
special_featuresO-RING PER ST7M251, NO FINISH, NO LUBRICANT; MINIMUM 40 PERCENT OF NON-BEARING HEAD SURFACE COAT WITH WHITE PAINT, COLOR 37875 PER FED-STD-595, REMOVABLE WITH SOLVENT
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN5305-01-477-5835
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT4020-5-19A · 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: 0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.7025 INCHES MINIMUM AND 1.7495 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE FASTENER
•
THREAD LENGTH: 0.531 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: AGAV
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629, PH13-8MO ASSN STD SINGLE MATERIAL RESPONSE FASTENER
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
FEATURES PROVIDED: O RING AND CETYL ALCOHOL LUBRICANT
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN
FASTENER LENGTH1.7025 INCHES MINIMUM AND 1.7495 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE FASTENER
THREAD LENGTH0.531 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONAGAV
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629, PH13-8MO ASSN STD SINGLE MATERIAL RESPONSE FASTENER
NOMINAL THREAD DIAMETER0.3125 INCHES IN
FEATURES PROVIDEDO RING AND CETYL ALCOHOL LUBRICANT
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
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 2
ST3M652C5-19ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
WC4020-5-19ASame 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 HT4020-5-19A?
HT4020-5-19A is a SCREW,CLOSE TOLERANCE.
What parts can replace HT4020-5-19A?
There are 2 known substitutes for HT4020-5-19A: ST3M652C5-19A, WC4020-5-19A. Substitute compatibility should be verified for your specific system.
What is the NSN for HT4020-5-19A?
HT4020-5-19A is cataloged in the U.S. Government catalog under NSN 5305-01-477-5835. 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.