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663998-12 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

663998-12: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, overall_width: 0.1250 INCHES MINIMUM AND 0.1255 INCHES MAXIMUM IN, overall_height: 0.1250 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN, overall_length: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN, style_designator: PLAIN, starting_edge_shape: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-320-3624, 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
663998-12
NSN: 5315-01-320-3624
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width0.1250 INCHES MINIMUM AND 0.1255 INCHES MAXIMUM IN
overall_height0.1250 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN
overall_length0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
style_designatorPLAIN
starting_edge_shapeROUND
starting_edge_radius0.062 INCHES NOMINAL IN
NSN5315-01-320-3624
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 663998-12 · 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
•
STARTING EDGE SHAPE: ROUND
•
STYLE DESIGNATOR: PLAIN
•
STARTING EDGE RADIUS: 0.062 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.1250 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN
STARTING EDGE SHAPEROUND
STYLE DESIGNATORPLAIN
OVERALL LENGTH0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
OVERALL WIDTH0.1250 INCHES MINIMUM AND 0.1255 INCHES MAXIMUM IN
STARTING EDGE RADIUS0.062 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
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 1
T8382675-12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 663998-12?
663998-12 is a KEY,MACHINE.
What parts can replace 663998-12?
There is 1 known substitute for 663998-12: T8382675-12. Substitute compatibility should be verified for your specific system.
What is the NSN for 663998-12?
663998-12 is cataloged in the U.S. Government catalog under NSN 5315-01-320-3624. 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.