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5545999 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

5545999: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include flat_height: 0.445 INCHES MINIMUM AND 0.445 INCHES MINIMUM AND 0.451 INCHES MAXIMUM0.451 INCHES MAXIMUM IN, overall_width: 0.373 INCHES NOMINAL0.373 INCHES NOMINAL IN, overall_height: 0.740 INCHES MINIMUM AND 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN, overall_length: 1.083 INCHES MINIMUM AND 1.083 INCHES MINIMUM AND 1.088 INCHES MAXIMUM1.088 INCHES MAXIMUM IN, style_designator: STEPPEDSTEPPED, first_flat_length: 0.901 INCHES NOMINAL0.901 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-351-1955, 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
5545999
NSN: 5315-01-351-1955
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
flat_height0.445 INCHES MINIMUM AND 0.445 INCHES MINIMUM AND 0.451 INCHES MAXIMUM0.451 INCHES MAXIMUM IN
overall_width0.373 INCHES NOMINAL0.373 INCHES NOMINAL IN
overall_height0.740 INCHES MINIMUM AND 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN
overall_length1.083 INCHES MINIMUM AND 1.083 INCHES MINIMUM AND 1.088 INCHES MAXIMUM1.088 INCHES MAXIMUM IN
style_designatorSTEPPEDSTEPPED
first_flat_length0.901 INCHES NOMINAL0.901 INCHES NOMINAL IN
NSN5315-01-351-1955
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5545999 · 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
•
FIRST FLAT LENGTH: 0.901 INCHES NOMINAL0.901 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STEPPEDSTEPPED
•
FLAT HEIGHT: 0.445 INCHES MINIMUM AND 0.445 INCHES MINIMUM AND 0.451 INCHES MAXIMUM0.451 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.740 INCHES MINIMUM AND 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN
FIRST FLAT LENGTH0.901 INCHES NOMINAL0.901 INCHES NOMINAL IN
STYLE DESIGNATORSTEPPEDSTEPPED
OVERALL LENGTH1.083 INCHES MINIMUM AND 1.083 INCHES MINIMUM AND 1.088 INCHES MAXIMUM1.088 INCHES MAXIMUM IN
OVERALL WIDTH0.373 INCHES NOMINAL0.373 INCHES NOMINAL IN
FLAT HEIGHT0.445 INCHES MINIMUM AND 0.445 INCHES MINIMUM AND 0.451 INCHES MAXIMUM0.451 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 5545999?
5545999 is a KEY,MACHINE.
What is the NSN for 5545999?
5545999 is cataloged in the U.S. Government catalog under NSN 5315-01-351-1955. 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.