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557964 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

557964: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: MAGNESIUM ALLOY ZK60A OVERALL, overall_diameter: 0.626 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND, material_document_and_classification: QQ-M-31,T5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-107-4167, 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
557964
NSN: 5310-01-107-4167
FSC: 5310 — Nuts and Washers
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialMAGNESIUM ALLOY ZK60A OVERALL
overall_diameter0.626 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
material_document_and_classificationQQ-M-31,T5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-107-4167
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 557964 · 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: 0.626 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-M-31,T5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: MAGNESIUM ALLOY ZK60A OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.626 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-M-31,T5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALMAGNESIUM ALLOY ZK60A OVERALL
CENTER HOLE SHAPE STYLEROUND
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 557964?
557964 is a WASHER,FLAT.
What is the NSN for 557964?
557964 is cataloged in the U.S. Government catalog under NSN 5310-01-107-4167. 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.