MS21042L3
OEMActive ADNUT,SELF-LOCKING,EXTENDED WASHER
Where to Buy
Search this part number directly on major distributors
Documentation
General information based on part classification, not a certification determination. Your operator's quality manual governs.
What to ask the seller for
- FAA Form 8130-3 from the PAH or an authorized release traceable to the PAH
- Manufacturer's CofC if a Form 8130-3 was not issued
Governing reference: FAA Order 8130.21J
PMA Alternatives
No PMA alternatives found for this part. This does not mean none exist — only that none are currently in our database.
Supplemental Type Certificates
FAA-approved modifications that reference this part number
No current STCs reference this part number in their description.
Airworthiness Directives1 FAA Active
Synced 40 days ago (09/27/2026)AD 2025-03-04
Inspection of self-locking nuts for loss of locking feature
Manufacturing defect in a specific lot of MS21042L3 self-locking nuts may result in loss of locking feature. Inspect for lot code stamping and replace affected nuts.
Service Difficulty Reports1 report
New service difficulty report for MS21042L3 landing gear bolt application. Fatigue crack found at 8,200 FH on companion bolt; nut found below torque spec.
Suspect-Parts Alerts (SUP/UPN)
No Suspect-Parts Alerts
This manufacturer is not named in any active FAA Suspect Unapproved Parts (SUP/UPN) notification.
NSN Cross-References1 NSN — DLA WebFLIS
National Stock Numbers assigned to this part number by the U.S. Defense Logistics Agency
| NSN | Standardized Name | FSC | DLA List Price (gov't catalog) | CAGE / Manufacturer |
|---|---|---|---|---|
| 5310-00-807-1474 | NUT,SELF-LOCKING,EXTENDED WASHER | 5310 | $29.43/HD | 0PXV4THE BOEING COMPANY DIV SERVICES |
DLA PUBLOG published list price — government procurement catalog, not a commercial market price. Prices may differ from current commercial availability.
Government Award Prices
U.S. government contract award prices from FPDS — unit prices for NSN purchases by DoD/DLA agencies
No government contract award price data found for this part number.
Identifiers
Manufacturer
THE BOEING COMPANY DIV SERVICES
Source
DLA WebFLIS
ATA Chapter
20
Type
OEM