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HR239-6-66 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HR239-6-66: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 4.115 INCHES MINIMUM AND 4.135 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN, head_diameter: 0.704 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-362-7262, 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
HR239-6-66
NSN: 5305-01-362-7262
FSC: 5305 — Screws
CAGE: 73197 — HI-SHEAR CORPORATION (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleFLAT COUNTERSUNK
grip_length4.115 INCHES MINIMUM AND 4.135 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN
head_diameter0.704 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN
thread_length0.578 INCHES NOMINAL IN
fastener_length4.476 INCHES MINIMUM AND 4.506 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatmentPASSIVATE OVERALL
internal_drive_styleOFFSET CRUCIFORM (TORQUE SET)
NSN5305-01-362-7262
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HR239-6-66 · 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: 4.476 INCHES MINIMUM AND 4.506 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.578 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 4.115 INCHES MINIMUM AND 4.135 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH4.476 INCHES MINIMUM AND 4.506 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.578 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5737 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH4.115 INCHES MINIMUM AND 4.135 INCHES MAXIMUM IN
GRIP DIAMETER0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
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
SC3103-6-66Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
123742-6-66Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AIC1651-6-66Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
PBF1416-6-66Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
E008-6-66Reference 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 HR239-6-66?
HR239-6-66 is a SCREW,CLOSE TOLERANCE.
What parts can replace HR239-6-66?
There are 5 known substitutes for HR239-6-66: SC3103-6-66, 123742-6-66, AIC1651-6-66 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HR239-6-66?
HR239-6-66 is cataloged in the U.S. Government catalog under NSN 5305-01-362-7262. 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.