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HS2623-4Z-11Y — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HS2623-4Z-11Y: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP H11 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM IN, head_diameter: 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-891-1730, 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
HS2623-4Z-11Y
NSN: 5305-00-891-1730
FSC: 5305 — Screws
CAGE: 97928 — HUCK INTL INC (USA)
SPECIFICATIONS
materialSTEEL COMP H11 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM IN
head_diameter0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
fastener_length1.069 INCHES MINIMUM AND 1.116 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-00-891-1730
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HS2623-4Z-11Y · 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: 1.069 INCHES MINIMUM AND 1.116 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MAC PS13145 FSCM 76301 MFR REF ALL TREATMENT RESPONSES OVERALL
•
THREAD LENGTH: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.069 INCHES MINIMUM AND 1.116 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMAC PS13145 FSCM 76301 MFR REF ALL TREATMENT RESPONSES OVERALL
THREAD LENGTH0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
GRIP DIAMETER0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
HT308-4-11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M547-4-11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
66904H4-11Reference document
Same NSN cross-reference
Reference document — Secondary reference
HT8115-4-11YSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
66117H4-11Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HS2623-4Z-11Y?
HS2623-4Z-11Y is a SCREW,CLOSE TOLERANCE.
What parts can replace HS2623-4Z-11Y?
There are 5 known substitutes for HS2623-4Z-11Y: HT308-4-11, ST3M547-4-11, 66904H4-11 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HS2623-4Z-11Y?
HS2623-4Z-11Y is cataloged in the U.S. Government catalog under NSN 5305-00-891-1730. 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.