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PC Tolerances
PC
Tolerances

Magnetic
Tolerance

Material
(Mix No.)

-2

-8

-14

-18

-19

-26

-28

-30

-33

-34

-35

-38

-40

-45

-52

-267

-275

AL Tolerance

±5%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

±10%

+35%

-25%

+35%

-25%

The cores are
manufactured to the AL values listed;
the permeability for each material is for reference
only. In all cases, the AL values are
based on a peak AC flux density of 10 guass (1mT)
at a frequency of 10kHz. Measurements made under
other conditions will produce results in accordance
with the magnetic curves shown in the Percent
Initial Permeability vs. Peak AC Flux Density Graph.

The toroidal cores
are tested with an evenly-spaced full single-layer
winding in order to minimize leakage effects. Iron
powder cores tested with a small number of turns
which are not evenly distributed will produce
higher inductance readings than expected. The E
cores are tested with 100 turns.

The Magnetic
Characteristic curves shown are have a typical
tolerance of ±10%. The curves on Core Loss
characteristics have a typical tolerance of
±15%.

Dimensional
Tolerances (inches)

TOROIDS*

OD

ID

Ht

TOROIDS*

OD

ID

Ht

T16-T20

±.010

±.010

±.010

T150-T225

±.025

±.025

±.030

T25-T38

±.015

±.015

±.020

T249-T400

±.030

±.030

±.030

T40-T72**

±.020

±.020

±.020

T520-T650

±.050

±.050

±.050

T44-T72**

±.020

±.020

±.020

T80-T141

±.020

±.020

±.025

-

COMPOSITE*

OD

ID

Ht

COMPOSITE*

OD

ID

Ht

ST50

±.015

±.015

±.020

ST150

±.040

±.030

±.030

ST83-ST102

±.030

±.020

±.025

ST200

±.050

±.040

±.040

-

BUS
BAR*

A

B

D

E

L

HS300-HS400

±.015

±.020

±.005

±.005

±.020

-

U
CORES

A

B

C

E

F

G

U61-U80

±.010

±.010

±.010

±.010

±.010

±.010

U350

±.020

±.020

±.015

±.020

±.015

±.030

-

E
CORES

A

B

C

D

F

G

MAX
GAP***

E49-E118

±.010

±.010

±.005

±.007

±.005

±.007

.0015

E125-E162

±.015

±.015

±.007

±.010

±.007

±.010

.0015

E168-E225

±.015

±.015

±.010

±.010

±.007

±.010

.0020

E305-E450

±.030

±.030

±.015

±.020

±.015

±.020

.0030

E610

±.040

±.040

±.025

±.030

±.025

±.030

.0050

-

EF
CORES

A

B

C

D

E/F

G

MAX
GAP***

EF60-EF80

±.010

±.010

±.005

±.010

±.005

±.007

.0030

-

EM
CORES

A

B

C

D

G

H

MAX
GAP***

EM145

±.015

±.015

±.010

±.020

±.010

±.015

.0020

EM168-EM220

±.015

±.015

±.010

±.020

±.010

±.015

.0030

-

PLAIN
CORES

OD

L

Pxx24-Pxx40

+.000/-.005

±.015

Pxx48-Pxx76

+.000/-.005

±.020

-

HOLLOW
CORES

OD

ID

L

Hx10-Hx12

+.000/-.005

+.005/-.000

±.010

Hxx14-Hxx20

+.000/-.005

+.005/-.000

±.015

Hxx21-Hxx25

+.000/-.005

+.005/-.000

±.020

-

DISCS

OD

CB

ID

T

D45-D80

+.000/-.010

+.005/-.000

+.005/-.000

±.007

-

*Tolerance includes
coating
**Gap per piece

** OD for T50-8/90
and T50-8B/90 is + 025/-
.015

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