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R8321664-139 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

R8321664-139: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, head_height: 0.234 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.720 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN, thread_length: 1.016 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-734-1874, 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
R8321664-139
NSN: 5305-01-734-1874
FSC: 5305 — Screws
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK
head_height0.234 INCHES NOMINAL IN
thread_class3A A
head_diameter0.720 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
thread_length1.016 INCHES NOMINAL IN
fastener_length1.210 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
locking_featureSELF-LOCKING LOCKING FEATURE
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
surface_treatmentOXIDE OVERALL
width_across_flats0.219 INCHES NOMINAL IN
NSN5305-01-734-1874
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: R8321664-139 · 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
•
WIDTH ACROSS FLATS: 0.219 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.234 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.210 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-DTL-13294,CLASS 1 OR MIL-DTL-16232,TYPE M, CLASS 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 1.016 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: FF-S-86 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.3750 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.219 INCHES NOMINAL IN
HEAD HEIGHT0.234 INCHES NOMINAL IN
FASTENER LENGTH1.210 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-DTL-13294,CLASS 1 OR MIL-DTL-16232,TYPE M, CLASS 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH1.016 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONFF-S-86 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.3750 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SPECIFICATION/STANDARD DATA80205-NAS-24667 NATIONAL STD/SPEC
SUBSTITUTES & CROSS-REFERENCES 5
752-8840871-139Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
68-17-3125AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LOA049060-139Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS24667-53BLReference document
Same NSN cross-reference
Reference document — Secondary reference
NASM24667Reference document
Same NSN cross-reference
Reference document — Design control — primary 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 R8321664-139?
R8321664-139 is a SCREW,CAP,SOCKET HEAD.
What parts can replace R8321664-139?
There are 5 known substitutes for R8321664-139: 752-8840871-139, 68-17-3125A, LOA049060-139 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R8321664-139?
R8321664-139 is cataloged in the U.S. Government catalog under NSN 5305-01-734-1874. 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.