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321351R1 — BOLT,SQUARE NECK

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

321351R1: BOLT,SQUARE NECK.

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNKFLAT COUNTERSUNK, neck_width: 1.000 INCHES MINIMUM AND 1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM1.031 INCHES MAXIMUM IN, thread_class: 2A2A, head_diameter: 1.594 INCHES MINIMUM AND 1.594 INCHES MINIMUM AND 1.700 INCHES MAXIMUM1.700 INCHES MAXIMUM IN, thread_length: 2.000 INCHES MINIMUM2.000 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-038-4762, 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
321351R1
NSN: 5306-01-038-4762
FSC: 5306 — Bolts
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNKFLAT COUNTERSUNK
neck_width1.000 INCHES MINIMUM AND 1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM1.031 INCHES MAXIMUM IN
thread_class2A2A
head_diameter1.594 INCHES MINIMUM AND 1.594 INCHES MINIMUM AND 1.700 INCHES MAXIMUM1.700 INCHES MAXIMUM IN
thread_length2.000 INCHES MINIMUM2.000 INCHES MINIMUM IN
fastener_length3.250 INCHES NOMINAL3.250 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
countersink_angle81.0 DEGREES NOMINAL81.0 DEGREES NOMINAL
nominal_thread_diameter1.000 INCHES1.000 INCHES IN
thread_quantity_per_inch88
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5306-01-038-4762
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 321351R1 · 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: 3.250 INCHES NOMINAL3.250 INCHES NOMINAL IN
•
THREAD LENGTH: 2.000 INCHES MINIMUM2.000 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 1.000 INCHES1.000 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNKFLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NECK WIDTH: 1.000 INCHES MINIMUM AND 1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM1.031 INCHES MAXIMUM IN
•
COUNTERSINK ANGLE: 81.0 DEGREES NOMINAL81.0 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
FASTENER LENGTH3.250 INCHES NOMINAL3.250 INCHES NOMINAL IN
THREAD LENGTH2.000 INCHES MINIMUM2.000 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER1.000 INCHES1.000 INCHES IN
HEAD STYLEFLAT COUNTERSUNKFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NECK WIDTH1.000 INCHES MINIMUM AND 1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM1.031 INCHES MAXIMUM IN
COUNTERSINK ANGLE81.0 DEGREES NOMINAL81.0 DEGREES NOMINAL
THREAD CLASS2A2A
THREAD QUANTITY PER INCH88
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

No substitute or cross-reference records for this part.

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 321351R1?
321351R1 is a BOLT,SQUARE NECK.
What is the NSN for 321351R1?
321351R1 is cataloged in the U.S. Government catalog under NSN 5306-01-038-4762. 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.