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72346-4-20 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

72346-4-20: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: DOUBLE HEXAGON W/HOLE, grip_length: 1.250 INCHES NOMINAL IN, head_height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN, fastener_length: 1.720 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-243-7130, 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
72346-4-20
NSN: 5306-00-243-7130
FSC: 5306 — Bolts
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleDOUBLE HEXAGON W/HOLE
grip_length1.250 INCHES NOMINAL IN
head_height0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
fastener_length1.720 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.306 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
extended_washer_diameter0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
minimum_tensile_strength150000 POUNDS PER SQUARE INCH LBS
extended_washer_thickness0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN
material_document_and_classificationWASPALOY FSCM 71321 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5306-00-243-7130
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 72346-4-20 · 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
•
EXTENDED WASHER THICKNESS: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.720 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: WASPALOY FSCM 71321 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
HEAD STYLE: DOUBLE HEXAGON W/HOLE
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN
HEAD HEIGHT0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
FASTENER LENGTH1.720 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONWASPALOY FSCM 71321 MFR REF SINGLE MATERIAL RESPONSE OVERALL
HEAD STYLEDOUBLE HEXAGON W/HOLE
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.250 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.306 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM 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

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 72346-4-20?
72346-4-20 is a BOLT,CLOSE TOLERANCE.
What is the NSN for 72346-4-20?
72346-4-20 is cataloged in the U.S. Government catalog under NSN 5306-00-243-7130. 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.