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639975 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

639975: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.030 INCHES NOMINAL IN, hole_diameter: 1.141 INCHES NOMINAL IN, overall_diameter: 1.750 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-495-9591, 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
639975
NSN: 5310-00-495-9591
FSC: 5310 — Nuts and Washers
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.030 INCHES NOMINAL IN
hole_diameter1.141 INCHES NOMINAL IN
overall_diameter1.750 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-495-9591
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 639975 · 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: 1.750 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.141 INCHES NOMINAL IN
•
THICKNESS: 0.030 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.750 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.141 INCHES NOMINAL IN
THICKNESS0.030 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 5
GP4659DReference document
Same NSN cross-reference
Reference document — Secondary reference
S638-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
A0000806Reference document
Same NSN cross-reference
Reference document — Secondary reference
A806Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
R20979Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 639975?
639975 is a WASHER,FLAT.
What parts can replace 639975?
There are 5 known substitutes for 639975: GP4659D, S638-3, A0000806 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 639975?
639975 is cataloged in the U.S. Government catalog under NSN 5310-00-495-9591. 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.