Organization Standard Alpha Nominal
Resistance(ohms)
At 0°C
American Scientific
Apparatus Makers
Association (SAMA)
RC21-4-1966 0.003923 98.129
British Standards
Association
b.S. 1904-1964 0.003850 100
Normenstelle
Elektrotechnik
DIN 43760 0.003850 100
International Electrotechnical
Commission (Supersedes
BS&DIN)
IEC 751: 1983 0.003850 100
US Department
of Defense
MIL-T-24388 0.00392 100

Tolerance Classes for Wound Resistors

Tolerance Class Tolerance Value (°C) Temperature Range of
Validity of Tolerances
W 0.1 ±(0.1° + 0.0017[t]) -50° to 250°
W 0.15 ±(0.15° + 0.002[t]) -100° to 450°
W 0.3 ±(0.3° + 0.005[t]) -196° to 661°
W 0.6 ±(0.6° + 0.01[t]) -196° to 661°

Tolerance Classes for Film Resistors

Tolerance Class Tolerance Value (°C) Temperature Range of
Validity of Tolerances
F 0.1 ±(0.1° + 0.0017[t]) -50° to 250°
F 0.15 ±(0.15° + 0.002[t]) -50° to 450°
F 0.3 ±(0.3° + 0.005[t]) -50° to 661°
F 0.6 ±(0.6° + 0.01[t]) -50° to 661°

Tolerance Classes for Thermometers (Finished Probes)

Tolerance Class Tolerance Value (°C) Temperature Range of
Validity of Tolerances
AA ±(0.1° + 0.0017[t]) -50° to 250°
A ±(0.13° + 0.0017[t]) -100° to 450°
B ±(0.25° + 0.0042[t]) -196° to 600°
C ±(0.6° + 0.01[t]) -196° to 600°

Cut Sheet

Save PDF file       Open in new tab