PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 709-8500409 ITEM 40-2
709-8500409 ITEM 40-2 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-649-8198, 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
709-8500409 ITEM 40-2
NSN: 5310-01-649-8198
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number709-8500409 ITEM 40-2
NSN5310-01-649-8198
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 709-8500409 ITEM 40-2 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
MIL-DTL-1222 TYPE 1 GR 500Interchangeable
interchangeable cross-reference
interchangeable
709-8500408 ITEM 41-2Interchangeable
interchangeable cross-reference
interchangeable
709-8500409 ITEM 1-11Interchangeable
interchangeable cross-reference
interchangeable
709-8500409Interchangeable
interchangeable cross-reference
interchangeable
0.734ODX0.406IDX0.063 CRES 316Interchangeable
interchangeable cross-reference
interchangeable
709-8500409 ITEM 1-16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy 709-8500409 ITEM 40-2?
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 709-8500409 ITEM 40-2?
709-8500409 ITEM 40-2 is a WASHER,FLAT.
What parts can replace 709-8500409 ITEM 40-2?
There are 24 known substitutes for 709-8500409 ITEM 40-2: MIL-DTL-1222 TYPE 1 GR 500, 709-8500408 ITEM 41-2, 709-8500409 ITEM 1-11 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 709-8500409 ITEM 40-2?
709-8500409 ITEM 40-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-649-8198. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 709-8500409 ITEM 40-2

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026