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HT4020-6-20A — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT4020-6-20A: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN, head_height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-128-5124, 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
HT4020-6-20A
NSN: 5305-01-128-5124
FSC: 5305 — Screws
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
head_height0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
head_diameter0.756 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
thread_length0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES THREADS
fastener_length1.875 INCHES MINIMUM AND 1.922 INCHES MAXIMUM IN
special_featuresFURNISHED WITH ONE O-RING
thread_directionRIGHT-HAND
NSN5305-01-128-5124
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT4020-6-20A · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
HEAD HEIGHT: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.875 INCHES MINIMUM AND 1.922 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD HEIGHT0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
FASTENER LENGTH1.875 INCHES MINIMUM AND 1.922 INCHES MAXIMUM IN
THREAD LENGTH0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
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 5
10115172Reference document
Same NSN cross-reference
Reference document — Informative reference only
ST3M652C6-20ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
119256-20ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M6526-20AReference document
Same NSN cross-reference
Reference document — Secondary reference
11925C6-20ASame 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 HT4020-6-20A?
HT4020-6-20A is a SCREW,CLOSE TOLERANCE.
What parts can replace HT4020-6-20A?
There are 5 known substitutes for HT4020-6-20A: 10115172, ST3M652C6-20A, 119256-20A and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HT4020-6-20A?
HT4020-6-20A is cataloged in the U.S. Government catalog under NSN 5305-01-128-5124. 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.