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999657-01 — WASHER,SPRING TENSION

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

999657-01: WASHER,SPRING TENSION.

The WASHER,SPRING TENSION is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5310-00-093-6621, 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
999657-01
NSN: 5310-00-093-6621
FSC: 5310 — Nuts and Washers
CAGE: 17472 — EATON AEROSPACE LLC DBA EATON INOAC DIV FUEL & MOTION CONTROL SYSTEMS DIVISION (USA)
SPECIFICATIONS
Part Number999657-01
NSN5310-00-093-6621
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 999657-01 · 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
SUBSTITUTES & CROSS-REFERENCES 8
B1000-050SReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
D6-27Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
679223Reference document
Same NSN cross-reference
Reference document — Secondary reference
10116551Reference document
Same NSN cross-reference
Reference document — Informative reference only
172B5316P1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
6701636-3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 999657-01?
999657-01 is a WASHER,SPRING TENSION.
What parts can replace 999657-01?
There are 8 known substitutes for 999657-01: B1000-050S, D6-27, 679223 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 999657-01?
999657-01 is cataloged in the U.S. Government catalog under NSN 5310-00-093-6621. 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.