MIL-PRF-39015-1 Resistors, Variable, Wire-Wound \(Lead-Screw Actuated\), Nonestablished Reliability And Established Reliability Style Rtr12This specification covers the associated requirements for style RTR12, lead-screw actuated, wire-wound, variable resistors. The resistors are available in a ??5 percent resistance tolerance and terminal types L, P, and Y.