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Technical Data Sheet
PartsTable / COMPONENT / 3-1-3291
3-1-3291 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

FLANGE,COMPANION,VEHICULAR UNIVE. Key specifications include overall_length: 2.562 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-264-2390, 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
3-1-3291
NSN: 5305-00-264-2390
FSC: 5305
CAGE: 56232 — LOCKHEED MARTIN CORPORATION DIV RMS - MITCHEL FIELD (USA)
SPECIFICATIONS
overall_length2.562 INCHES NOMINAL IN
NSN5305-00-264-2390
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3-1-3291 · 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
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD LENGTH: 0.188 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.188 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 40
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
SCREW MATERIAL: STEEL COMP 302
•
SCREW SURFACE TREATMENT: PASSIVATE
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD LENGTH0.188 INCHES MAXIMUM IN
FASTENER LENGTH0.188 INCHES NOMINAL IN
THREAD QUANTITY PER INCH40
NOMINAL THREAD DIAMETER0.112 INCHES IN
SCREW MATERIALSTEEL COMP 302
SCREW SURFACE TREATMENTPASSIVATE
THREAD CLASS2A A
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
20Z665Interchangeable
interchangeable cross-reference
interchangeable
3AH3-201Interchangeable
interchangeable cross-reference
interchangeable
3-1-3291Interchangeable
interchangeable cross-reference
interchangeable
207-1036P16Interchangeable
Same NIIN cross-reference
interchangeable
0453-124Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3-1-3291?
3-1-3291 is a FLANGE,COMPANION,VEHICULAR UNIVE.
What parts can replace 3-1-3291?
There are 5 known substitutes for 3-1-3291: 20Z665, 3AH3-201, 3-1-3291 and 2 more. Substitute compatibility should be verified for your specific system.
Is 3-1-3291 still available?
3-1-3291 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026