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HT8181F5-13 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT8181F5-13: 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: 0.802 INCHES MINIMUM AND 0.822 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.5449 INCHES MINIMUM AND 0.5451 INCHES MAXIMUM IN, head_diameter: 0.573 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-163-9294, 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
HT8181F5-13
NSN: 5305-01-163-9294
FSC: 5305 — Screws
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL COMP H11 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.802 INCHES MINIMUM AND 0.822 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.5449 INCHES MINIMUM AND 0.5451 INCHES MAXIMUM IN
head_diameter0.573 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
thread_length0.326 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length1.148 INCHES MINIMUM AND 1.195 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
NSN5305-01-163-9294
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT8181F5-13 · 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 GRIP
•
FASTENER LENGTH: 1.148 INCHES MINIMUM AND 1.195 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837 TYPE 2 CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.326 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES GRIP
FASTENER LENGTH1.148 INCHES MINIMUM AND 1.195 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837 TYPE 2 CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH0.326 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.802 INCHES MINIMUM AND 0.822 INCHES MAXIMUM IN
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 5
GB510N5A13Reference document
Same NSN cross-reference
Reference document — Secondary reference
HT326-5A13Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SFH22D5A13Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BM19045-513AReference document
Same NSN cross-reference
Reference document — Secondary reference
BG510CE5-13Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 HT8181F5-13?
HT8181F5-13 is a SCREW,CLOSE TOLERANCE.
What parts can replace HT8181F5-13?
There are 5 known substitutes for HT8181F5-13: GB510N5A13, HT326-5A13, SFH22D5A13 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HT8181F5-13?
HT8181F5-13 is cataloged in the U.S. Government catalog under NSN 5305-01-163-9294. 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.