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8S-4728 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

8S-4728: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, grip_length: 2.87 INCHES NOMINAL IN, head_height: 0.34 INCHES NOMINAL IN, fastener_length: 4.0 INCHES NOMINAL IN, special_features: NEXT HIGHER ASSEMBLY IS 204-0293 MOUNTING GP-MARINE XMSN. END ITEM IS 3054 AND 3054B MARINE ENGINE, CATERPILLAR., surface_treatment: OIL AND PHOSPHATE OVERALL.

This part is cataloged in the U.S. Government catalog under NSN 5306-01-661-2193, 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
8S-4728
NSN: 5306-01-661-2193
FSC: 5306 — Bolts
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
head_styleHEXAGON
grip_length2.87 INCHES NOMINAL IN
head_height0.34 INCHES NOMINAL IN
fastener_length4.0 INCHES NOMINAL IN
special_featuresNEXT HIGHER ASSEMBLY IS 204-0293 MOUNTING GP-MARINE XMSN. END ITEM IS 3054 AND 3054B MARINE ENGINE, CATERPILLAR.
surface_treatmentOIL AND PHOSPHATE OVERALL
width_between_flats0.69 INCHES NOMINAL IN
thread_quantity_per_inch20
thread_series_designatorUNF
NSN5306-01-661-2193
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8S-4728 · 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: 0.34 INCHES NOMINAL IN
•
FASTENER LENGTH: 4.0 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
•
GRIP LENGTH: 2.87 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 0.69 INCHES NOMINAL IN
•
SURFACE TREATMENT: OIL AND PHOSPHATE OVERALL
•
THREAD QUANTITY PER INCH: 20
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.34 INCHES NOMINAL IN
FASTENER LENGTH4.0 INCHES NOMINAL IN
HEAD STYLEHEXAGON
GRIP LENGTH2.87 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.69 INCHES NOMINAL IN
SPECIAL FEATURESNEXT HIGHER ASSEMBLY IS 204-0293 MOUNTING GP-MARINE XMSN. END ITEM IS 3054 AND 3054B MARINE ENGINE, CATERPILLAR.
SURFACE TREATMENTOIL AND PHOSPHATE OVERALL
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNF
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8S-4728?
8S-4728 is a BOLT,MACHINE.
What is the NSN for 8S-4728?
8S-4728 is cataloged in the U.S. Government catalog under NSN 5306-01-661-2193. 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.