Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1S20B25A4-27 found under Link Pitch Restrain by Pacific Scientific Company. The National Stock Number assigned to this part is 1615014213376, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1S20B25A4-27.