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6556605 PIECE 40 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6556605 PIECE 40: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include overall_width: 0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN, overall_height: 0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN, overall_length: 1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN, style_designator: PLAINPLAIN, starting_edge_shape: ROUNDROUND, starting_edge_radius: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-381-1380, 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
6556605 PIECE 40
NSN: 5315-01-381-1380
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
overall_width0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
overall_height0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
overall_length1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN
style_designatorPLAINPLAIN
starting_edge_shapeROUNDROUND
starting_edge_radius0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
NSN5315-01-381-1380
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6556605 PIECE 40 · 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: ROUNDROUND
•
STYLE DESIGNATOR: PLAINPLAIN
•
STARTING EDGE RADIUS: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
STARTING EDGE SHAPEROUNDROUND
STYLE DESIGNATORPLAINPLAIN
OVERALL LENGTH1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN
OVERALL WIDTH0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
STARTING EDGE RADIUS0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
845-6556605PC40Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
D20147-40Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 6556605 PIECE 40?
6556605 PIECE 40 is a KEY,MACHINE.
What parts can replace 6556605 PIECE 40?
There are 2 known substitutes for 6556605 PIECE 40: 845-6556605PC40, D20147-40. Substitute compatibility should be verified for your specific system.
What is the NSN for 6556605 PIECE 40?
6556605 PIECE 40 is cataloged in the U.S. Government catalog under NSN 5315-01-381-1380. 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.