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989C639H11 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

989C639H11: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYHEXAMETHYLENE AMIDE OVERALL, thickness: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN, hole_diameter: 0.168 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN, overall_diameter: 0.373 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-879-2575, 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
989C639H11
NSN: 5310-00-879-2575
FSC: 5310 — Nuts and Washers
CAGE: 18323 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA ELECTRONIC SYSTEMS (USA)
SPECIFICATIONS
materialPLASTIC POLYHEXAMETHYLENE AMIDE OVERALL
thickness0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
hole_diameter0.168 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN
overall_diameter0.373 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationASTM D4066 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-879-2575
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 989C639H11 · 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: 0.373 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM D4066 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
COLOR: BLACK OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: PLASTIC POLYHEXAMETHYLENE AMIDE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.168 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.373 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM D4066 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
COLORBLACK OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALPLASTIC POLYHEXAMETHYLENE AMIDE OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.168 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN
THICKNESS0.018 INCHES MINIMUM AND 0.022 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 5
AS7709-02Reference document
Same NSN cross-reference
Reference document — Secondary reference
NW-170-375-02-NReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
7000167-11Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LWNY-011NASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NW8-3752Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 989C639H11?
989C639H11 is a WASHER,FLAT.
What parts can replace 989C639H11?
There are 5 known substitutes for 989C639H11: AS7709-02, NW-170-375-02-N, 7000167-11 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 989C639H11?
989C639H11 is cataloged in the U.S. Government catalog under NSN 5310-00-879-2575. 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.