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25021 51 — WASHER,SADDLE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

25021 51: WASHER,SADDLE.

The WASHER,SADDLE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.328 INCHES NOMINAL IN, overall_width: 0.625 INCHES NOMINAL IN, overall_length: 0.625 INCHES NOMINAL IN, special_features: TWO KEYS ON THE CONVEX SIDE;OVERALL HEIGHT O.375 IN. IN, style_designator: SADDLE.

This part is cataloged in the U.S. Government catalog under NSN 5310-00-804-5017, 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
25021 51
NSN: 5310-00-804-5017
NIINs: 008045017, 011962290
FSC: 5310 — Nuts and Washers
CAGE: 76823 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN IS DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.328 INCHES NOMINAL IN
overall_width0.625 INCHES NOMINAL IN
overall_length0.625 INCHES NOMINAL IN
special_featuresTWO KEYS ON THE CONVEX SIDE;OVERALL HEIGHT O.375 IN. IN
style_designatorSADDLE
material_thickness0.246 INCHES NOMINAL IN
NSN5310-00-804-5017
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 25021 51 · 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
•
STYLE DESIGNATOR: SADDLE
•
MATERIAL THICKNESS: 0.246 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.328 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSADDLE
OVERALL LENGTH0.625 INCHES NOMINAL IN
OVERALL WIDTH0.625 INCHES NOMINAL IN
MATERIAL THICKNESS0.246 INCHES NOMINAL IN
SPECIAL FEATURESTWO KEYS ON THE CONVEX SIDE;OVERALL HEIGHT O.375 IN. IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.328 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 25021 51?
25021 51 is a WASHER,SADDLE.
What is the NSN for 25021 51?
25021 51 is cataloged in the U.S. Government catalog under NSN 5310-00-804-5017. 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.