Part Number Ordering Information, example and explanation:
 
RER60F1001R where,
RER
60
F
1001
R
Style (Fixed, Wirewound, (Power Type, Chassis-Mounted), Established Reliability Resistors Conforming to MIL-PRF-39009)
Shape, Dimensions, Power Rating of the Resistor
Resistance Tolerance
Resistance Value (Ohms)
Failure Rate Level
 
Part number ordering options are developed using the following criteria:
Style
Detail Specification
Description
RER60
MIL-PRF-39009/1
5 Watt, Inductively Wound
RER65
MIL-PRF-39009/1
10 Watt, Inductively Wound
RER70
MIL-PRF-39009/1
20 Watt, Inductively Wound
RER75
MIL-PRF-39009/1
30 Watt, Inductively Wound
RER40
MIL-PRF-39009/2
5 Watt, Non-Inductively Wound
RER45
MIL-PRF-39009/2
10 Watt, Non-Inductively Wound
RER50
MIL-PRF-39009/2
20 Watt, Non-Inductively Wound
RER55
MIL-PRF-39009/2
30 Watt, Non-Inductively Wound
 
Resistance Tolerance
Failure Rate Level
F = ± 1%
P = 0.1%/1000 hrs (Level 2)
R = 0.01%/1000 hrs (Level 2)
Resistance Values:
The nominal resistance is expressed in ohms and is identified by four digits; the first three digits represent significant figures and the last digit specifies the number of zeros to follow. When fractional values of an ohm, and values of less than 100 ohms are required, the letter "R" is substituted for one of the significant digits to represent the decimal point. When the letter "R" is used, succeeding digits become significant. The following are examples of symbols for resistance values:

R100 = 0.10 ohm
1R00 = 1.0 ohm
38R3 = 38.3 ohms
1000 = 100 ohms
1001 = 1,000 ohms
3162 = 31,600 ohms