Part Number Ordering Information, example and explanation:   RBR54L10001BR where,

RBR	54	L	10001	B	R
Style (Fixed, Wirewound, (Accurate), Established Reliability Resistors Conforming to MIL-PRF-39005)	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
RBR52	MIL-PRF-39005/1		L = Solderable
RBR54	MIL-PRF-39005/3		U = Weldable
RBR56	MIL-PRF-39005/5
RBR57	MIL-PRF-39005/7
RBR71	MIL-PRF-39005/6
RBR74	MIL-PRF-39005/8
RBR75	MIL-PRF-39005/9

 

Resistance Tolerance		Failure Rate Level
T = ± 0.01 %		P = 0.1%/1000 hrs (Level 2)
Q = ± 0.02 %		R = 0.01%/1000 hrs (Level 1)
A = ± 0.05 %
B = ± 0.1%

Resistance Values:
Resistance values in ohms are contained in the following listing. When ordering, the first four digits represent significant figures and the last digit specifies the number of zeroes to follow. For example 10001 indicates 10,000 ohms and 10002 indicates 100,000 ohms. For values less than or equal to 1000 ohms the letter "R" is used to indicate a decimal point. For example 10R00 indicates 10.00 ohms.