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A51B11591-11 — PIN,FLANGE,PILOT SWING OUT STEP

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A51B11591-11: PIN,FLANGE,PILOT SWING OUT STEP.

PIN,FLANGE,PILOT SWING OUT STEP. This part is cataloged in the U.S. Government catalog under NSN 5315-00-520-1250, 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
A51B11591-11
NSN: 5315-00-520-1250
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
general_characteristics_item_descriptionSTEEL,CRES,AMS5659,RC38-C45,2.380 IN. LG,0.498 IN. MIN,0.499 IN. MAX DIA SHANK OVATE SHAPE FLANGE END,SHANK DRILLED FROM FLANGE END 0.250 IN. DIA,1.750 IN. D IN
NSN5315-00-520-1250
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51B11591-11 · 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
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GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL,CRES,AMS5659,RC38-C45,2.380 IN. LG,0.498 IN. MIN,0.499 IN. MAX DIA SHANK OVATE SHAPE FLANGE END,SHANK DRILLED FROM FLANGE END 0.250 IN. DIA,1.750 IN. D IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL,CRES,AMS5659,RC38-C45,2.380 IN. LG,0.498 IN. MIN,0.499 IN. MAX DIA SHANK OVATE SHAPE FLANGE END,SHANK DRILLED FROM FLANGE END 0.250 IN. DIA,1.750 IN. D 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 A51B11591-11?
A51B11591-11 is a PIN,FLANGE,PILOT SWING OUT STEP.
What is the NSN for A51B11591-11?
A51B11591-11 is cataloged in the U.S. Government catalog under NSN 5315-00-520-1250. 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.