SUPPRESSOR / SHIELDING |
Letter |
Description |
E |
Shielded 5/8" - 24 |
H |
Shielded 3/4" - 20 |
K |
Resistor (Special Application |
M |
Shielded 5/8" - 24 Ordnance |
R |
Resistor |
T |
13/16" - 20 thread Above Hexagon |
U |
Auxiliary Gap |
X |
Resistor (Special application) |
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|
SHELL DESIGN |
Letter |
Thread Size |
Reach |
Hex |
B |
18mm |
13/16" |
7/8" |
C |
14mm |
3/4" |
5/8" |
D |
18mm |
1/2" |
7/8" |
GC* |
7/8" - 18 |
All |
7/8 |
GM* |
18mm |
All |
7/8" |
H |
14mm |
7/16" |
13/16" |
J |
14mm |
3/8' |
13/16" |
L |
14mm |
1/2" or .472"
|
13/16" |
M |
18 |
1/2" |
7/8" |
N |
14mm |
3/4" |
13/16" |
S |
1-1/8" |
5/8" |
1" |
W |
7/8" - 18 |
All |
15/16" or 1 |
X |
14mm |
1/2" or .500" |
5/8" |
|
|
HEAT RANGE / APPLICATION |
Ref.# |
Description |
1-25 |
Automotive, small engine or ordnace |
75-99 |
Industrial & Special Application |
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|
FIRING END DESIGN |
Letter |
Description |
B |
Two Ground Electrodes |
C |
Copper Plus Design |
D |
Protruding Nose, Round Ground Electrode |
F |
Three Ground Electrode |
G |
Fine Wire-Semi Precious Electrode |
J |
Cutback Ground Electrode, Includes Modified Gap |
N |
Four Ground Electrode |
P |
Platinum Electrode |
R |
Push Wire |
Y |
Standard Projected |
*PP |
Double Platinum |
*PYP |
Projected Double Platinum |
*WP |
Iridium/Platinum |
WPC |
Iridium/Platinum/Copper |
WPCC |
Iridium/Platinum/Double Copper |
|
|
SPECIAL GAP DESIGNATION |
No. |
Description |
15 |
Gapped at .015" |
17 |
Gapped at .017" |
21 |
Gapped at .021" |
25 |
Gapped at .025" |
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