MIL-DTL-81381/21 wire-tin plated conductor
These wires have two layers of polyimide/FEP tape insulation with a polyimide hard coat (or polyamide braid for AWG 8 and larger sizes of M81381/22 types) for increased cut-through and abrasion resistance.
　

Specifications

Voltage rating - volts 600 　 Temperature rating °C -55 to 150 　 Insulation Two layers of FEP/polyimide/FEP tape with modified aromatic polyimide coating. 　 Conductor Tin-Plated Copper 　 Conductor Size (AWG) 22 　 Conductor Dia. Minimum - inches (mm) .029 (.74) 　 Conductor Dia. Maximum - inches (mm) .033 (.84) 　 Stranding 19/34 　 Insulation Diameter Minimum - inches (mm) .041 (1.04) 　 Insulation Diameter Maximum - inches (mm) .045 (1.14) 　 Weight - pounds/1000 feet (Kg/1000m) 3.0 (4.4) 　 Maximum Resistance Ohm/1,000 feet (ohm/Km), @ 20°C 16.2 (53.14)

Item # Conductor Size (AWG) Conductor Dia. Minimum - inches (mm) Conductor Dia. Maximum - inches (mm) Stranding Insulation Diameter Minimum - inches (mm) Insulation Diameter Maximum - inches (mm) Maximum Resistance Ohm/1,000 feet (ohm/Km), @ 20°C M81381/21-10 10 .106 (2.69) .114 (2.90) 37/26 .120 (3.05) .125 (3.18) 1.26 (4.13) M81381/21-12 12 .084 (2.13) .090 (2.29) 37/28 .097 (2.46) .102 (2.59) 2.02 (6.63) M81381/21-14 14 .065 (1.65) .073 (1.85) 19/27 .077 (1.96) .083 (2.11) 3.06 (10.04) M81381/21-16 16 .052 (1.32) .058 (1.47) 19/29 .064 (1.63) .069 (1.75) 4.81 (15.78) M81381/21-18 18 .046 (1.17) .051 (1.30) 19/30 .058 (1.47) .063 (1.60) 6.23 (20.43) M81381/21-20 20 .037 (.94) .041 (1.04) 19/32 .048 (1.22) .053 (1.35) 9.88 (32.41) M81381/21-22 22 .029 (.74) .033 (.84) 19/34 .041 (1.04) .045 (1.14) 16.2 (53.14) M81381/21-24 24 .023 (.58) .026 (.66) 19/36 .034 (.86) .038 (.97) 26.2 (85.94) M81381/21-26 26 .018 (.46) .021 (.53) 19/38 .030 (.76) .034 (.86) 41.3 (135.46)