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74A410620-2003 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

74A410620-2003: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, hole_diameter: 1.770 INCHES NOMINAL IN, outside_diameter: 2.250 INCHES NOMINAL IN, special_features: TWO INTERNAL PREBENT KEYS, material_thickness: 0.060 INCHES NOMINAL IN, minimum_tensile_strength: 180000 POUNDS PER SQUARE INCH LBS. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-120-5129, 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
74A410620-2003
NSN: 5310-01-120-5129
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
hole_diameter1.770 INCHES NOMINAL IN
outside_diameter2.250 INCHES NOMINAL IN
special_featuresTWO INTERNAL PREBENT KEYS
material_thickness0.060 INCHES NOMINAL IN
minimum_tensile_strength180000 POUNDS PER SQUARE INCH LBS
external_prebent_key_angle25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM
external_prebent_key_width0.250 INCHES NOMINAL IN
external_prebent_key_length0.220 INCHES NOMINAL IN
internal_prebent_key_length0.250 INCHES NOMINAL IN
material_document_and_classificationMIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6758,COND E2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-120-5129
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 74A410620-2003 · 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
•
EXTERNAL PREBENT KEY LENGTH: 0.220 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6758,COND E2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.250 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.060 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY ANGLE: 25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM
•
INTERNAL PREBENT KEY LENGTH: 0.250 INCHES NOMINAL IN
•
MINIMUM TENSILE STRENGTH: 180000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
EXTERNAL PREBENT KEY LENGTH0.220 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6758,COND E2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.250 INCHES NOMINAL IN
MATERIAL THICKNESS0.060 INCHES NOMINAL IN
EXTERNAL PREBENT KEY ANGLE25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM
INTERNAL PREBENT KEY LENGTH0.250 INCHES NOMINAL IN
SPECIAL FEATURESTWO INTERNAL PREBENT KEYS
MINIMUM TENSILE STRENGTH180000 POUNDS PER SQUARE INCH LBS
EXTERNAL PREBENT KEY WIDTH0.250 INCHES NOMINAL IN
MATERIALSTEEL COMP 4130 OVERALL
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
10109366Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74A410620-2003?
74A410620-2003 is a WASHER,KEY.
What parts can replace 74A410620-2003?
There is 1 known substitute for 74A410620-2003: 10109366. Substitute compatibility should be verified for your specific system.
What is the NSN for 74A410620-2003?
74A410620-2003 is cataloged in the U.S. Government catalog under NSN 5310-01-120-5129. 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.