BOLT, MACH 12 PT HD .250-28 X .625 (P/N ms9557-08) - New Surplus
P/N: ms9557-08
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 | 214 Available |
Product Description
The MS9557-08 is a 12-point machine bolt with 1/4-28 UNJF thread and 0.625-inch length. Manufactured from A-286 alloy per AMS5731, this fastener provides superior corrosion and heat resistance for high-stress applications. The double-hex extended-washer head enables compact wrenching in confined spaces while distributing load across a wider bearing surface.
Commonly used to secure airframe and engine components requiring both strength and minimal installation envelope. Installation requires 3A thread engagement per MS9557 specification and torque per applicable aircraft maintenance manual.
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, MACH 12 PT HD .250-28 X .625 (P/N ms9557-08)?
The MS9557-08 is a 12-point machine bolt with 1/4-28 UNJF thread and 0. 625-inch length.
Does the ms9557-08 meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The BOLT, MACH 12 PT HD .250-28 X .625 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 ms9557-08 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 ms9557-08.
Can I order the ms9557-08 in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The BOLT, MACH 12 PT HD .250-28 X .625 is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.