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6556818 — PIN,GROOVED,HEADED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6556818: PIN,GROOVED,HEADED.

The PIN,GROOVED,HEADED is a the manufacturer industrial component. Key specifications include HEIGHT: 0.094 INCHES NOMINAL0.094 INCHES NOMINAL IN, DIAMETER: 0.498 INCHES MINIMUM AND 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM0.499 INCHES MAXIMUM IN, HEAD STYLE: ROUND W/WRENCH FLATSROUND W/WRENCH FLATS, UNDERCUT WIDTH: 0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN, FIRST END STYLE: SLOTTEDSLOTTED, STYLE DESIGNATOR: GROOVEGROOVE. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-353-3703, 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
6556818
NSN: 5315-01-353-3703
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
HEIGHT0.094 INCHES NOMINAL0.094 INCHES NOMINAL IN
DIAMETER0.498 INCHES MINIMUM AND 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM0.499 INCHES MAXIMUM IN
HEAD STYLEROUND W/WRENCH FLATSROUND W/WRENCH FLATS
UNDERCUT WIDTH0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN
FIRST END STYLESLOTTEDSLOTTED
STYLE DESIGNATORGROOVEGROOVE
UNDER HEAD LENGTH3.562 INCHES NOMINAL3.562 INCHES NOMINAL IN
UNDERCUT DIAMETER0.469 INCHES NOMINAL0.469 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
FIRST HOLE DIAMETER0.188 INCHES MINIMUM AND 0.188 INCHES MINIMUM AND 0.189 INCHES MAXIMUM0.189 INCHES MAXIMUM IN
FIRST END SLOT DEPTH0.594 INCHES NOMINAL0.594 INCHES NOMINAL IN
FIRST END SLOT WIDTH0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM0.200 INCHES MAXIMUM IN
NSN5315-01-353-3703
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6556818 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
•
UNDERCUT WIDTH: 0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN
•
UNDERCUT DIAMETER: 0.469 INCHES NOMINAL0.469 INCHES NOMINAL IN
•
HOLE ARRANGEMENT STYLE: DRILLED SLOTTED ENDDRILLED SLOTTED END
•
UNDER HEAD LENGTH: 3.562 INCHES NOMINAL3.562 INCHES NOMINAL IN
•
FIRST END SLOT WIDTH: 0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM0.200 INCHES MAXIMUM IN
•
FIRST END STYLE: SLOTTEDSLOTTED
•
FIRST HOLE DIAMETER: 0.188 INCHES MINIMUM AND 0.188 INCHES MINIMUM AND 0.189 INCHES MAXIMUM0.189 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
UNDERCUT WIDTH0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN
UNDERCUT DIAMETER0.469 INCHES NOMINAL0.469 INCHES NOMINAL IN
HOLE ARRANGEMENT STYLEDRILLED SLOTTED ENDDRILLED SLOTTED END
UNDER HEAD LENGTH3.562 INCHES NOMINAL3.562 INCHES NOMINAL IN
FIRST END SLOT WIDTH0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM0.200 INCHES MAXIMUM IN
FIRST END STYLESLOTTEDSLOTTED
FIRST HOLE DIAMETER0.188 INCHES MINIMUM AND 0.188 INCHES MINIMUM AND 0.189 INCHES MAXIMUM0.189 INCHES MAXIMUM IN
STYLE DESIGNATORGROOVEGROOVE
DIAMETER0.498 INCHES MINIMUM AND 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM0.499 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
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 6556818?
6556818 is a PIN,GROOVED,HEADED.
What is the NSN for 6556818?
6556818 is cataloged in the U.S. Government catalog under NSN 5315-01-353-3703. 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.