BOLT (P/N ms9557-21) - New Surplus
P/N: ms9557-21
Category: Bolts
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 | 2 Available |
Product Description
The MS9557-21 is a 1/4-28 UNJF-3A machine bolt with a 12-point extended-washer head, manufactured from A286 corrosion and heat-resistant steel per AMS 5731. This fastener meets Military Standard MS9557 specifications (superseded by SAE AS9557) and provides reliable fastening in aircraft structural and systems assemblies. The extended-washer head design distributes load across a wider bearing surface, reducing stress concentration in critical joints.
Installation follows standard aerospace fastener practices and aircraft maintenance manual torque requirements.
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 BOLT (P/N ms9557-21)?
The MS9557-21 is a 1/4-28 UNJF-3A machine bolt with a 12-point extended-washer head, manufactured from A286 corrosion and heat-resistant steel per AMS 5731. This fastener meets Military Standard MS9557 specifications (superseded by SAE AS9557) and provides reliable fastening in aircraft structural and systems assemblies.
What conditions is the ms9557-21 available in?
The ms9557-21 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 ms9557-21?
The ms9557-21 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 ms9557-21?
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.