MIL-R-26-5 Resistor, Fixed, Wirewound Power Type, Styles Rw70, Rw74, Rw78, And Rw79This specification covers the associated requirements for styles RW70, RW74, RW78, and RW79, wirewound inductive resistors.

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MIL-R-26/5D

	RW70	RW74	RW78	RW79
A	.406 ±.031	.875 ±.062	1.780 ±.062	.560 ±.062
B	.094 ±.031	.312 ±.031	.375 ±.031	.187 ±.031
D	.020 ±.0015	.040 ±.002	.040 ±.002	.032 ±.002

Inch	mm	Inch	mm	Inch	mm	Inch	mm
.0015	.04	.032	.81	.187	4.75	.560	14.22
.002	.05	.040	1.02	.312	7.92	.875	22.23
.020	.51	.062	1.57	.375	9.53	1.750	44.45
.031	.79	.094	2.39	.406	10.31	1.780	45.21

NOTES:

1. Dimensions are in inches.

2. Metric equivalents are given for general information only.

3. These styles shall be untapped.

4. The end of the resistor body is the point where the diameter reduces to 0.06 inch.

FIGURE 1. Styles RW70, RW74, RW78, and RW79.

4. VERIFICATION

4.1 Sampling and inspection. Sampling and inspection shall be in accordance with MIL-PRF-26 .

4.2 Short-time overload. The short time overload shall be 5 times rated wattage for 5 seconds for style RW70 and RW79, and 10 times rated wattage for 5 seconds for styles RW74, and RW78; however, in no case shall the voltage exceed the values specified in table V.

TABLE V. Maximum voltages for short-time overload.

Resistor style

RW70

RW74

RW78

RW79

Voltage

(volts maximum)

300

700

1,500

300