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Iridium Power® Spark Plug Specifications

Jan 16, 2023

NUMBER
STOCK NO.
THREAD DIAMETER (mm)
THREAD REACH (mm)
HEX SIZE (in)
GAP (mm)
INSULATOR PROJECTION (mm)
IK16#4
5303
14
19
5/8
1.1
1.5
IK20#4
5304
14
19
5/8
1.1
1.5
IK22#4
5310
14
19
5/8
0.8
1.5
IK22G#4
5348
14
19
5/8
0.8
1.5
IK24#4
5311
14
19
5/8
0.8
1.5
IK27#4
5312
14
19
5/8
0.8
0.5
IK31#4
5321
14
19
5/8
0.8
-0.5
IK34#4
5322
14
19
5/8
0.8
-0.5
IKH16#4
5343
14
26.5
5/8
1.1
1.5
IKH20#4
5344
14
26.5
5/8
1.1
1.5
IKH22#4
5345
14
26.5
5/8
0.8
1.5
IKH24#4
5346
14
26.5
5/8
0.8
1.5
IKH27#4
5347
14
26.5
5/8
0.8
1.5
IQ16#4
5301
14
19
5/8
1.1
1.5
IQ20#4
5302
14
19
5/8
1.1
1.5
IQ22#4
5313
14
19
5/8
0.8
1.5
IQ24#4
5314
14
19
5/8
0.8
1.5
IQ27#4
5315
14
19
5/8
0.8
0.5
IQ31#4
5323
14
19
5/8
0.8
-0.5
IQ34#4
5324
14
19
5/8
0.8
-0.5
IT16#4
5325
14
.708”
5/8
1.1
1.5
IT20#4
5326
14
.708”
5/8
1.1
1.5
IT22#4
5327
14
.708”
5/8
1.1
1.5
IT24#4
5328
14
.708”
5/8
0.8
-0.5
IT27#4
5329
14
.708”
5/8
0.8
-0.5
ITF16#4
5330
14
.460”
5/8
1.1
1.5
ITF20#4
5331
14
.460”
5/8
1.1
1.5
ITF22#4
5332
14
.460”
5/8
1.1
1.5
ITF24#4
5333
14
.460”
5/8
0.8
-0.5
ITF27#4
5334
14
.460”
5/8
0.8
-0.5
ITL16#4
5349
14
25
5/8
1.1
1.5
ITL20#4
5350
14
25
5/8
1.1
1.5
ITV16#4
5338
14
25
5/8
1.1
1.5
ITV20#4
5339
14
25
5/8
1.1
1.5
ITV22#4
5340
14
25
5/8
0.8
-0.5
ITV24#4
5341
14
25
5/8
0.8
-0.5
ITV27#4
5342
14
25
5/8
0.8
-0.5
IU20#4
5360
10
19
5/8
0.9
-0.5
IU22#4
5361
10
19
5/8
0.9
-0.5
IU24#4
5362
10
19
5/8
0.9
-0.5
IU24A#4
5365
10
19
5/8
0.9
-0.5
IU27#4
5363
10
19
5/8
0.9
-0.5
IU27A#4
5366
10
19
5/8
0.9
-0.5
IU31#4
5364
10
19
5/8
0.9
-0.5
IU31A#4
5367
10
19
5/8
0.9
-0.5
IUF22#4
5383
10
12.7
5/8
0.8
0.6
IUF24#4
5384
10
12.7
5/8
0.8
0.6
IUF27A#4
5385
10
12.7
5/8
0.8
0.6
IUF31A#4
5386
10
12.7
5/8
0.8
0.6
IUH24#4
5368
10
19
5/8
0.9
0.6
IUH27#4
5369
10
19
5/8
0.9
0.6
IW16#4
5305
14
19
13/16
1.1
1.5
IW20#4
5306
14
19
13/16
1.1
1.5
IW22#4
5307
14
19
13/16
0.8
1.5
IW24#4
5316
14
19
13/16
0.7
-0.5
IW27#4
5317
14
19
13/16
0.7
-0.5
IW29#4
5318
14
19
13/16
0.7
-0.5
IW31#4
5319
14
19
13/16
0.7
-0.5
IW34#4
5320
14
19
13/16
0.7
-0.5
IWM24#4
5391
14
19
13/16
0.8
-1.5
IWM27#4
5392
14
19
13/16
0.8
-1.5
IWM31#4
5393
14
19
13/16
0.8
-1.5
IWF16#4
5359
14
12.7
13/16
0.8
1.5
IWF20#4
5378
14
12.7
13/16
0.8
1.5
IWF22#4
5379
14
12.7
13/16
0.8
-0.5
IWF24#4
5380
14
12.7
13/16
0.8
-0.5
IWF27#4
5381
14
12.7
13/16
0.8
-0.5
IX22#4
5371
12
19
18mm
0.8
0.6
IX22B#4
5375
12
19
18mm
0.9
1.5
IX24#4
5372
12
19
18mm
0.8
0.6
IX24B#4
5376
12
19
18mm
0.9
1.5
IX27#4
5373
12
19
18mm
0.8
0.6
IX27B#4
5377
12
19
18mm
0.9
1.5
IXU22#4
5308
12
19
5/8
0.9
1.3
IXU24#4
5309
12
19
5/8
0.9
1.3
IXU27#4
5337
12
19
5/8
0.9
1.3