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A51H20647-13 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A51H20647-13: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-12 OVERALL, flat_height: 0.093 INCHES NOMINAL IN, overall_width: 0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN, overall_height: 0.871 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN, overall_length: 0.875 INCHES NOMINAL IN, style_designator: STEPPED. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-135-3658, 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
A51H20647-13
NSN: 5315-01-135-3658
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP XM-12 OVERALL
flat_height0.093 INCHES NOMINAL IN
overall_width0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
overall_height0.871 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN
overall_length0.875 INCHES NOMINAL IN
style_designatorSTEPPED
countersink_angle120.0 DEGREES NOMINAL
first_flat_length0.250 INCHES NOMINAL IN
mounting_hole_depth0.188 INCHES MAXIMUM IN
starting_edge_shapeSTRAIGHT
mounting_hole_diameter0.044 INCHES MAXIMUM AND 0.215 INCHES MAXIMUM IN
mounting_hole_thread_class3B
NSN5315-01-135-3658
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51H20647-13 · 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: 0.250 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE AND QUANTITY: 2 PLAIN AND 1 THREADED-COUNTERSUNK
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: STEPPED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5659 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MOUNTING HOLE DIAMETER: 0.044 INCHES MAXIMUM AND 0.215 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.871 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN
FIRST FLAT LENGTH0.250 INCHES NOMINAL IN
MOUNTING HOLE TYPE AND QUANTITY2 PLAIN AND 1 THREADED-COUNTERSUNK
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORSTEPPED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5659 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.044 INCHES MAXIMUM AND 0.215 INCHES MAXIMUM IN
OVERALL LENGTH0.875 INCHES NOMINAL IN
OVERALL WIDTH0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
DISTANCE FROM MOUNTING HOLE CENTER TO END0.120 INCHES MAXIMUM AND 0.453 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: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A51H20647-13?
A51H20647-13 is a KEY,MACHINE.
What is the NSN for A51H20647-13?
A51H20647-13 is cataloged in the U.S. Government catalog under NSN 5315-01-135-3658. 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.