Used on aircraft; engine f110. 2a 1st end thread class unique to GE129 engine; differentiated by added radius for equipment revision, otherwise same as MS51525B5s passivate surface treated unf 1st end thread series
Used on pacerdawn. 2a 2nd end thread class simular to p/n 367599, heat treat to RC38-42 per mil-h-6875, surface roughness 125 microinches unf 2nd end thread series