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Part No.
Plug Size.
Rec Bore Measurement.
5/16
.313
3/8
.375
13/32
.406
27/64
.422
7/16
.438
29/64
.453
1/2
.500
33/64
.516
17/32
.531
9/16
.563
37/64
.578
19/32
.593
39/64
.609
5/8
.625
41/64
.640
21/32
.656
11/16
.688
3/4
.750
13/16
.813
7/8
.875
29/32
.906
15/16
.938
1
1.0000
1 1/16
1.0625
1 1/8
1.1250
1 3/16
1.1875
1 7/32
1.2188
1 1/4
1.2500
1 5/16
1.3125
1 21/64
1.328
1 3/8
1.375
1 7/16
1.4375
1 31/64
1.4843
1 1/2
1.500
1 9/16
1.5625
1 5/8
1.625
1 41/64
1.6406
1 11/16
1.6875
1 45/64
1.703
1 3/4
1.750
1 49/64
1.766
1 25/32
1.781
1 51/64
1.796
1 13/16
1.813
1 7/8
1.875
1 29/32
1.906
1 59/64
1.922
1 15/16
1.938
1 61/64
1.953
1 31/32
1.969
1 63/64
1.984
2
2.000
2 1/64
2.016
2 3/64
2.047
2 1/16
2.063
2 3/32
2.094
2 7/64
2.109
2 1/8
2.125
2 9/64
2.141
2 5/32
2.156
2 3/16
2.188
2 13/64
2.203
2 7/32
2.219
2 1/4
2.250
2 3/8
2.375
2 1/2
2.500
2 9/16
2.563
2 3/4
2.750