BOLT (P/N ms9557-21) - New Surplus
P/N: ms9557-21
Category: Fasteners & Hardware
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 This fastener meets Military Standard MS9557 specifications (superseded by SAE AS9557) and provides reliable fastening in aircraft structural and systems assemblies.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 This fastener meets Military Standard MS9557 specifications (superseded by SAE AS9557) and provides reliable fastening in aircraft structural and systems assemblies.
Does the ms9557-21 meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The BOLT conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.
What material is the ms9557-21 manufactured from?
Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the ms9557-21.
Can I order the ms9557-21 in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The BOLT is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.
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