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90770A029 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

90770A029: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN, hole_diameter: 0.266 INCHES NOMINAL IN, overall_diameter: 0.625 INCHES NOMINAL IN, special_features: MATERIAL ALLOY 20 STAINLESS STEEL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-589-9639, 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
90770A029
NSN: 5310-01-589-9639
FSC: 5310 — Nuts and Washers
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
hole_diameter0.266 INCHES NOMINAL IN
overall_diameter0.625 INCHES NOMINAL IN
special_featuresMATERIAL ALLOY 20 STAINLESS STEEL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleBLANK RECTANGULAR
part_name_assigned_by_controlling_agencyALLOY 20 STAINLESS STEEL CORROSION RESISTANT WASHER
NSN5310-01-589-9639
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 90770A029 · 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
•
OVERALL DIAMETER: 0.625 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: BLANK RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.266 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.625 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEBLANK RECTANGULAR
SPECIAL FEATURESMATERIAL ALLOY 20 STAINLESS STEEL
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYALLOY 20 STAINLESS STEEL CORROSION RESISTANT WASHER
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.266 INCHES NOMINAL IN
THICKNESS0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 90770A029?
90770A029 is a WASHER,FLAT.
What is the NSN for 90770A029?
90770A029 is cataloged in the U.S. Government catalog under NSN 5310-01-589-9639. 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.