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243-6408950 FIND 18 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

243-6408950 FIND 18: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include overall_width: 3.363 INCHES MINIMUM AND 3.363 INCHES MINIMUM AND 3.364 INCHES MAXIMUM3.364 INCHES MAXIMUM IN, overall_height: 3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN, overall_length: 23.000 INCHES NOMINAL23.000 INCHES NOMINAL IN, style_designator: OCTAGON SHAPEOCTAGON SHAPE, counterbore_depth: 1.870 INCHES NOMINAL1.870 INCHES NOMINAL IN, key_chamfer_angle: 90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-376-1031, 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
243-6408950 FIND 18
NSN: 5315-01-376-1031
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
overall_width3.363 INCHES MINIMUM AND 3.363 INCHES MINIMUM AND 3.364 INCHES MAXIMUM3.364 INCHES MAXIMUM IN
overall_height3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN
overall_length23.000 INCHES NOMINAL23.000 INCHES NOMINAL IN
style_designatorOCTAGON SHAPEOCTAGON SHAPE
counterbore_depth1.870 INCHES NOMINAL1.870 INCHES NOMINAL IN
key_chamfer_angle90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
key_chamfer_length3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN
mounting_hole_depth1.870 INCHES NOMINAL1.870 INCHES NOMINAL IN
starting_edge_shapeCHAMFEREDCHAMFERED
counterbore_diameter1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
mounting_hole_diameter0.533 INCHES MINIMUM AND 0.533 INCHES MINIMUM AND 0.539 INCHES MAXIMUM0.539 INCHES MAXIMUM IN
mounting_hole_thread_class2B2B
NSN5315-01-376-1031
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 243-6408950 FIND 18 · 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
•
KEY CHAMFER ANGLE: 90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
•
MOUNTING HOLE TYPE AND QUANTITY: 1 THREADED-COUNTERBORED1 THREADED-COUNTERBORED
•
STARTING EDGE SHAPE: CHAMFEREDCHAMFERED
•
STYLE DESIGNATOR: OCTAGON SHAPEOCTAGON SHAPE
•
MOUNTING HOLE DIAMETER: 0.533 INCHES MINIMUM AND 0.533 INCHES MINIMUM AND 0.539 INCHES MAXIMUM0.539 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN
KEY CHAMFER ANGLE90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
MOUNTING HOLE TYPE AND QUANTITY1 THREADED-COUNTERBORED1 THREADED-COUNTERBORED
STARTING EDGE SHAPECHAMFEREDCHAMFERED
STYLE DESIGNATOROCTAGON SHAPEOCTAGON SHAPE
MOUNTING HOLE DIAMETER0.533 INCHES MINIMUM AND 0.533 INCHES MINIMUM AND 0.539 INCHES MAXIMUM0.539 INCHES MAXIMUM IN
OVERALL LENGTH23.000 INCHES NOMINAL23.000 INCHES NOMINAL IN
OVERALL WIDTH3.363 INCHES MINIMUM AND 3.363 INCHES MINIMUM AND 3.364 INCHES MAXIMUM3.364 INCHES MAXIMUM IN
DISTANCE FROM MOUNTING HOLE CENTER TO END1.680 INCHES NOMINAL1.680 INCHES NOMINAL IN
COUNTERBORE DEPTH1.870 INCHES NOMINAL1.870 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 1
211055245Reference 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 243-6408950 FIND 18?
243-6408950 FIND 18 is a KEY,MACHINE.
What parts can replace 243-6408950 FIND 18?
There is 1 known substitute for 243-6408950 FIND 18: 211055245. Substitute compatibility should be verified for your specific system.
What is the NSN for 243-6408950 FIND 18?
243-6408950 FIND 18 is cataloged in the U.S. Government catalog under NSN 5315-01-376-1031. 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.