PartsTable
Technical Data Sheet
Download PDF

5310-99-603 — WASHER,FLAT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5310-99-603: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include length: 2.650 INCHES NOMINAL IN, material: ALUMINUM OVERALL, nut_style: CASTELLATED, HEXAGON, thickness: 0.094 INCHES NOMINAL IN, nut_height: 0.677 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN, thread_class: 2B. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-452-2576, 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
5310-99-603
NSN: 5340-00-452-2576
NIINs: 004522576, 004522706, 004527894, 004688487, 004690013, 004690218, 004712938, 004717525, 004718006
FSC: 5340 — Hardware, Commercial
CAGE: 99995 — NATO STOCK NUMBER ASSIGNED BY ANOTHER NATION
SPECIFICATIONS
length2.650 INCHES NOMINAL IN
materialALUMINUM OVERALL
nut_styleCASTELLATED, HEXAGON
thickness0.094 INCHES NOMINAL IN
nut_height0.677 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
thread_class2B
hole_diameter0.719 INCHES NOMINAL IN
thread_seriesUNF
overall_height1.450 INCHES NOMINAL IN
shoulder_height0.100 INCHES NOMINAL IN
outside_diameter0.941 INCHES NOMINAL IN
overall_diameter1.219 INCHES NOMINAL IN
NSN5340-00-452-2576
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5310-99-603 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
•
LENGTH: 2.650 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
•
CROSS-SECTIONAL SHAPE: ROUND
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
LENGTH2.650 INCHES NOMINAL IN
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
CROSS-SECTIONAL SHAPEROUND
SUBSTITUTES & CROSS-REFERENCES 1
F269741Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
Ready to buy 5310-99-603?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 5310-99-603?
5310-99-603 is a WASHER,FLAT.
What parts can replace 5310-99-603?
There is 1 known substitute for 5310-99-603: F269741. Substitute compatibility should be verified for your specific system.
What is the NSN for 5310-99-603?
5310-99-603 is cataloged in the U.S. Government catalog under NSN 5340-00-452-2576. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 5310-99-603

✓ 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.