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Large cones are the original Pyrometric Cones. Widely used as a witness cone on the kiln shelf to visually monitor the firing progress and the heatwork developed throughout the kiln.

Large Cones need to be supported by a cone plaque, a clay pat or a wire cone holder. Cones are mounted at an 8° angle and so either 1 ¾ or 2” of the cone is exposed above the pat. The 1 ¾” mounting height matches that used by Self-Supporting Cones.  2" mounting height temperatures are listed in the description of each cone.

Uniform mounting height and angle are very important. 

Thermocouples measure temperature at one point inside the kiln.  Pyrometric cones can be placed throughout the ware setting so you can easily monitor the heatwork produced by the kiln.

Please Note:  For Cone numbers between 010 and 3, Orton manufactures 2 different series of cones in this range; LRB and IFB.  The standard series of cones between 010-3 are "red" and designated "LRB".  The "Iron-Free" series of cones between 010-3 are color coded and are designated "IFB".

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Cone Template Centigrade
Pocket Size Measuring Template for Orton Large and Self- Supporting Cones. Temperature equivalents are on the back in Celsius. Great for measuring the bending angle af a fired cone!
K600 C
$1.00
Cone Template Fahrenheit
Pocket Size Measuring Template for Orton Large and Self-Supporting Cones. Temperature equivalents are on the back in Fahrenheit. Great for measuring the bending angle af a fired cone!
K600 F
$1.00
LG CONE PLAQUE, 4 HOLE, CONES 022-34
Large cone plaques can be used for Large cones 022 through 34 (each box contains 50 - 4 hole plaques).
P9000 L-4 50
$27.60
42 LARGE REGULAR 50/BOX
P9780 LRB-42
$45.00
41 LARGE REGULAR 50/BOX
P9770 LRB-41
$45.00
40 LARGE REGULAR 50/BOX
P9760 LRB-40
$45.00
39 LARGE REGULAR 50/BOX
P9750 LRB-39
$45.00
38 LARGE REGULAR 50/BOX
P9740 LRB-38
$45.00
37 LARGE REGULAR 50/BOX
P9730 LRB-37
$45.00
36 LARGE REGULAR 50/BOX
P9720 LRB-36
$45.00
35 LARGE REGULAR 50/BOX
P9710 LRB-35
$11.80
34 LARGE REGULAR 50/BOX
P9700 LRB-34
$11.80
33 LARGE REGULAR 50/BOX
P9690 LRB-33
$11.80
32 1/2 LARGE REGULAR 50/BOX
P9680 LRB-32H
$11.80
32 LARGE REGULAR 50/BOX
P9670 LRB-32
$11.80
31 1/2 LARGE REGULAR 50/BOX
P9660 LRB-31H
$11.80
31 LARGE REGULAR 50/BOX
P9650 LRB-31
$11.80
30 LARGE REGULAR 50/BOX
P9640 LRB-30
$11.80
29 LARGE REGULAR 50/BOX
P9630 LRB-29
$11.80
28 LARGE REGULAR 50/BOX
P9620 LRB-28
$11.80
27 LARGE REGULAR 50/BOX
P9610 LRB-27
$11.80
26 LARGE REGULAR 50/BOX
P9600 LRB-26
$11.80
23 LARGE REGULAR 50/BOX
P9590 LRB-23
$11.80
21 LARGE REGULAR 50/BOX
P9580 LRB-21
$11.80
20 LARGE REGULAR 50/BOX
P9570 LRB-20
$11.80
19 LARGE REGULAR 50/BOX
P9560 LRB-19
$11.80
18 LARGE REGULAR 50/BOX
P9550 LRB-18
$11.80
17 LARGE REGULAR 50/BOX
P9540 LRB-17
$11.80
16 LARGE REGULAR 50/BOX
P9530 LRB-16
$11.80
15 LARGE REGULAR 50/BOX
P9500 LRB-15
$11.80
14 LARGE REGULAR 50/BOX
P9480 LRB-14
$11.80
13 LARGE REGULAR 50/BOX
P9450 LRB-13
$11.80
12 LARGE REGULAR 50/BOX
P9440 LRB-12
$11.80
11 LARGE REGULAR 50/BOX
P9430 LRB-11
$11.80
10 LARGE REGULAR 50/BOX
P9420 LRB-10
$11.80
9 LARGE REGULAR 50/BOX
P9410 LRB-9
$11.80
8 LARGE REGULAR 50/BOX
P9400 LRB-8
$11.80
7 1/2 LARGE REGULAR 50/BOX
P9385 LRB-7H
$11.80
7 LARGE REGULAR 50/BOX
P9380 LRB-7
$11.80
6 LARGE REGULAR 50/BOX
P9360 LRB-6
$11.80
5 LARGE REGULAR 50/BOX
P9340 LRB-5
$11.80
4 LARGE REGULAR 50/BOX
P9320 LRB-4
$11.80
3 LARGE IRON FREE 50/BOX
P9301 IFB-3
$11.80
3 LARGE REGULAR -Red 50/BOX
P9300 LRB-3
$11.80
2 LARGE REGULAR -Red 50/BOX
P9290 LRB-2
$11.80
1 LARGE IRON FREE 50/BOX
P9281 IFB-1
$11.80
1 LARGE REGULAR -Red 50/BOX
P9280 LRB-1
$11.80
01 LARGE IRON FREE 50/BOX
P9271 IFB-01
$11.80
01 LARGE REGULAR -Red 50/BOX
P9270 LRB-01
$11.80
02 LARGE IRON FREE 50/BOX
P9261 IFB-02
$11.80
Large pyrometric cones