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3N-371 PIECE 146 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

3N-371 PIECE 146: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, head_style: HEXAGON, head_height: 0.370 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.386 INCHES MINIMUM AND 1.540 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-113-4808, 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
3N-371 PIECE 146
NSN: 5306-01-113-4808
FSC: 5306 — Bolts
CAGE: 54370 — ALFA LAVAL INC. (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
head_styleHEXAGON
head_height0.370 INCHES NOMINAL IN
thread_class2A A
thread_length1.386 INCHES MINIMUM AND 1.540 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
fastener_length1.540 INCHES NOMINAL IN
style_designatorCONCENTRIC HOLE THREADED
thread_directionRIGHT-HAND
threads_per_inch18 CONCENTRIC HOLE
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.312 INCHES CONCENTRIC HOLE IN
NSN5306-01-113-4808
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3N-371 PIECE 146 · 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
•
HEAD HEIGHT: 0.370 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.540 INCHES NOMINAL IN
•
INTERNAL THREAD LENGTH: 0.750 INCHES NOMINAL CONCENTRIC HOLE IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
•
INTERNAL THREAD DIRECTION: RIGHT-HAND CONCENTRIC HOLE
•
THREAD LENGTH: 1.386 INCHES MINIMUM AND 1.540 INCHES MAXIMUM IN
•
THREADS PER INCH: 18 CONCENTRIC HOLE
•
STYLE DESIGNATOR: CONCENTRIC HOLE THREADED
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.370 INCHES NOMINAL IN
FASTENER LENGTH1.540 INCHES NOMINAL IN
INTERNAL THREAD LENGTH0.750 INCHES NOMINAL CONCENTRIC HOLE IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
INTERNAL THREAD DIRECTIONRIGHT-HAND CONCENTRIC HOLE
THREAD LENGTH1.386 INCHES MINIMUM AND 1.540 INCHES MAXIMUM IN
THREADS PER INCH18 CONCENTRIC HOLE
STYLE DESIGNATORCONCENTRIC HOLE THREADED
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 1
A-C9402-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3N-371 PIECE 146?
3N-371 PIECE 146 is a BOLT,INTERNALLY RELIEVED BODY.
What parts can replace 3N-371 PIECE 146?
There is 1 known substitute for 3N-371 PIECE 146: A-C9402-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 3N-371 PIECE 146?
3N-371 PIECE 146 is cataloged in the U.S. Government catalog under NSN 5306-01-113-4808. 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.