BOLT (P/N ms9557-17) - New Surplus

The MS9557-17 is a 1/4-28 UNJF machine bolt with a 12-point extended-washer head, manufactured from A-286 heat- and corrosion-resistant alloy steel per AMS 5731. This aerospace-grade fastener provides high strength for accessory bracket installations where 12-point drive access is required. The UNJF thread form ensures precise fit with matching hardware in aircraft systems.

Installation requires torque per the applicable aircraft maintenance manual, with length confirmed to MS9557 standard specifications.

What is the BOLT (P/N ms9557-17)?

The MS9557-17 is a 1/4-28 UNJF machine bolt with a 12-point extended-washer head, manufactured from A-286 heat- and corrosion-resistant alloy steel per AMS 5731. This aerospace-grade fastener provides high strength for accessory bracket installations where 12-point drive access is required.

Does the ms9557-17 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 ms9557-17 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 ms9557-17.

Can I order the ms9557-17 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.