This is a kind of Flat Washers. It is a specification for flat washers used in aerospace applications. The specification outlines the requirements for the physical characteristics, materials, dimensions, and performance of these washers. Specifically, NAS1149 washers are designed to provide a load distribution surface between the head of a fastener and the material being fastened, such as a structural panel or other component.
Function: Washers Aircraft ( NAS-1149 Series, Replaces AN960 Series )
Manufacturer: Genuine Aircraft Hardware
In addition to the NAS1149 specification, there are other specifications and standards that govern the use of washers in aerospace applications, such as MIL-STD-3003 and NAS3350. These standards ensure that the washers used in aerospace applications meet the highest quality and performance standards to ensure the safety and reliability of the aircraft or spacecraft.
1. Remove all burrs and sharp edges.
2. Dimensions in inches and apply after finish unless otherwise specified.
3. Surface roughness shall be 125 microinches Ra per asme B46.1
The function of this semiconductor is Head Solid Rivet.
The MS20470 Rivet is the most common fastener used in the aircraft structuralassembly. The two initial letter in the part number identifies the standard, is military-Military Standard. The number 20470 identifies the geometry of the rivet, in this case: universal head. The head is like mushroom head.The identification part number presents one or two additional letters after the standard and geometry.
This letters identifies the material of the rivet. Hard 2117 aluminum alloy. Heat treated with a minimum tensile strength of 38,000 PSI. Rivet, solid universal head, aluminum alloy and titanium columbium alloy , Military Specification.