WASHER, 4-40 UNC SINGLE COIL (P/N sp58a) - New Surplus
P/N: sp58a
Category: Washers
This product requires a custom quote. Please contact our sales team for pricing information or submit an RFQ (Request for Quote).
Available Inventory
| Condition | Stock |
|---|---|
| New Surplus | 425 Available |
Product Description
The sp58a is a steel single-coil lock washer sized for #4-40 UNC fasteners. This helical spring washer sits beneath screw heads or nuts to prevent loosening caused by vibration and thermal cycling. Commonly installed in avionics equipment mounts, instrument panel assemblies, and other vibration-sensitive aircraft structures.
The washer conforms to MS35338 specifications and ASME B18.21.1 standards. Install per aircraft maintenance manual torque guidance, placing the washer between the fastener and component surface to maintain secure connections during flight operations.
Please note: Product descriptions are provided for informational purposes. Always refer to your aircraft's Illustrated Parts Catalog (IPC) to verify part compatibility and specifications.
Frequently Asked Questions
What is the WASHER, 4-40 UNC SINGLE COIL (P/N sp58a)?
The sp58a is a steel single-coil lock washer sized for #4-40 UNC fasteners. This helical spring washer sits beneath screw heads or nuts to prevent loosening caused by vibration and thermal cycling.
What conditions is the sp58a available in?
The sp58a is currently available in the following conditions: New Surplus. Each condition reflects the part's maintenance history and certification status per FAA standards.
How do I get pricing for the sp58a?
The sp58a requires a custom quote. Submit a Request for Quote (RFQ) through our website or call our sales team at (904) 998-9101 for immediate pricing assistance.
Do you offer expedited shipping for the sp58a?
Yes, we offer same-day processing on in-stock items and provide 24/7 AOG (Aircraft on Ground) support for urgent needs. Standard, expedited, and overnight shipping options are available.