GPG® Part Numbering System
 

1

1

77

0

12

SHELL TYPE

# Thread Reach Hex
1  18mm  13/16"    7/8"
2  14mm  3/4"        5/8"
3  18mm  1/2"        7/8"
6  14mm  1/2" or 13/16"
             .472
7  18mm  1/2"        7/8" or
                           11/16"
8  14mm    3/4"    13/16"
9  7/8"-18 all      15/16" or
                             1"

RESISTOR

0 = non resistor
1 = standard resistor
2 = inductive resistor

HEAT RANGE

GROUND TYPE

0 =“J” gap
1 =4 Ground
2 =Precious Metal
3 =Double platinum
4 =Iridium
5 =Iridium/Rhodium
 or Round Ground
6 =Parallel Bars
7= Three Ground

GAP