Part Number Ordering Information, example and explanation:   RWR78S1002FS where,

RWR	78	S	1002	F	S
Style (Fixed, Wirewound, (Power Type), Established Reliability Resistors Conforming to MIL-PRF-39007)	Shape, Dimensions, Power Rating of the Resistor	Terminal Characteristics	Resistance Value (Ohms)	Resistance Tolerance	Failure Rate Level

  Part number ordering options are developed using the following criteria:

Style	Detail Specification		Terminal Characteristics
RWR78	MIL-PRF-39007/7		W = Weldable, Inductively Wound
RWR80	MIL-PRF-39007/8		S = Solderable, Inductively Wound
RWR81	MIL-PRF-39007/9		N = Solderable, Noninductively Wound
RWR84	MIL-PRF-39007/10		Z = Weldable, Noniductively Wound
RWR89	MIL-PRF-39007/11

 

Resistance Tolerance		Failure Rate Level
B = ± 0.1 %		P = 0.1%/1000 hrs (Level 2)
D = ± 0.5 %		R = 0.01%/1000 hrs (Level 2)
F = ± 1%		S = 0.001%/1000 hrs (Level 1)
		T = Space Level (See Application Notes)

Resistance Values:
Resistance values in ohms are contained in the following listing. When ordering, the first three digits represent significant figures and the last digit specifies the number of zeroes to follow. For example 1001 indicates 1,000 ohms and 1002 indicates 10,000 ohms. For values less than or equal to 100 ohms the letter "R" is used to indicate a decimal point. For example 10R0 indicates 10.0 ohms.