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6665643 ITEM 5 — PIN,GROOVED,HEADED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6665643 ITEM 5: PIN,GROOVED,HEADED.

The PIN,GROOVED,HEADED is a the manufacturer industrial component. Key specifications include height: 0.688 INCHES NOMINAL IN, diameter: 0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, material: STEEL COMP 630 OVERALL, head_style: HEXAGON, grip_length: 2.750 INCHES NOMINAL IN, first_end_style: SQUARE. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-424-1888, 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
6665643 ITEM 5
NSN: 5315-01-424-1888
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
height0.688 INCHES NOMINAL IN
diameter0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
materialSTEEL COMP 630 OVERALL
head_styleHEXAGON
grip_length2.750 INCHES NOMINAL IN
first_end_styleSQUARE
undercut_radius0.062 INCHES NOMINAL IN
effective_length2.750 INCHES NOMINAL IN
special_featuresITEM IS THREADED ON ONE END
style_designatorGROOVE
under_head_length3.688 INCHES NOMINAL IN
undercut_diameter0.312 INCHES NOMINAL IN
NSN5315-01-424-1888
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6665643 ITEM 5 · 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: 1.125 INCHES NOMINAL IN
•
UNDERCUT DIAMETER: 0.312 INCHES NOMINAL IN
•
UNDER HEAD LENGTH: 3.688 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
•
STYLE DESIGNATOR: GROOVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A564 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
EFFECTIVE LENGTH: 2.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.125 INCHES NOMINAL IN
UNDERCUT DIAMETER0.312 INCHES NOMINAL IN
UNDER HEAD LENGTH3.688 INCHES NOMINAL IN
FIRST END STYLESQUARE
STYLE DESIGNATORGROOVE
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A564 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
EFFECTIVE LENGTH2.750 INCHES NOMINAL IN
HEAD STYLEHEXAGON
GRIP LENGTH2.750 INCHES NOMINAL 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6665643 ITEM 5?
6665643 ITEM 5 is a PIN,GROOVED,HEADED.
What is the NSN for 6665643 ITEM 5?
6665643 ITEM 5 is cataloged in the U.S. Government catalog under NSN 5315-01-424-1888. 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.