MIL-PRF-26H, PERFORMANCE SPECIFICATION, RESISTORS, FIXED, WIRE WOUND (POWER TYPE) GENERAL SPECIFICATION FOR (15 SEP 2006)., This specification covers the general requirements for power type, wire-wound, fixed resistors for use in electrical, communications, and associated equipment. Included are general purpose styles of 5 percent initial resistance tolerance, with power ratings ranging from 3 watts to 240 watts at 25OC, derated to 0 power at 350OC (characteristics N and V) and precision axial lead types of .1(B) percent, .5 (D) percent, and 1 (F) percent initial resistance tolerances with power ratings ranging from 1 watt to 10 watts at 25OC, derated to 0 power at 250OC (characteristic U).