PG gland thread sizes Listed below is the necessary information for drilling and tapping holes for Rose+Bopla’s PG or metric cable grips and the appropriate tap part number. Thick wall applications require that you tap holes for cable glands. Thin wall applications may be drilled through with a nut.
CROSS REFERENCE CHART
DRILL HOLE AND TAP INFORMATION
CABLE GRIP SELECTION GUIDE
Metric Cable Grip Size
Tap Size
Metric Tapped Hole Size
Inch Tapped Hole Size
Closest American Drill Size
Metric Through Hole
Inch Through Hole
M 12
M 12x1.5
10.5 mm
M 16
M 16x1.5
14.5mm
0.413
z(.413)
12.2mm
0.480
0.571
37/64"(.578)
16.2mm
M 20
M 20x1.5
0.638
18.5mm
0.728
47/64"(.734)
20.2mm
0.795
M 25 M 32
M 25x1.5
23.5mm
0.925
59/64"*(.922)
25.2mm
0.992
M 32x1.5
30.5mm
1.2
32.2mm
M 40
1.268
M 40x1.5
38.5mm
1.516
40.2mm
1.583
If you are going to use a polyamide grip with a nut and are not going to tap the hole, you will need to drill a larger hole to push the grip through. Use the chart below for the correct size hole.
Cable Grip Size
Rose PG Tap Part Number
PG 7 PG 9
Metric Tapped Hole Size
Inch Tapped Hole Size
Closest American Drill Size
Metric Through Hole
Inch Through Hole
08070000
11.5mm
0.453
29/64" ( .453)
12.3mm
0.484
08090000
14mm
0.551
35/64" ( .547)
15.1mm
0.594
PG 11
08110000
17.25mm
0.679
46/63"( .672)
19.6mm
0.772
PG 13.5
08130000
19mm
0.748
3/4"( .750)
20.2mm
0.795
PG 16
08160000
21.25mm
0.837
53/64"( .828)
22.3mm
0.878
PG 21
08210000
27mm
1.063
1 1/16"(1.063)
28.2mm
1.11
PG 29
08290000
35.5mm
1.398
1 25/64"(1.391)
36.9mm
1.453
PG 36
08360000
45.5mm
1.791
1 51/64"(1.797)
48.8mm
1.921
PG 42
08420000
52.8mm
2.079
2 5/64"(2.078)
PG 48
08480000
58mm
2.283
2 9/32"(2.281)
mm 36.5 48 610 612 712
Wire Size Inches .12.26 .18.32 .24.39 .24.47 .28.47
1014 1318 1418 2025 2432 3238 3744
Metric Size
PG Size
American Size
M12 M16 M16 M20
PG7 PG 9 PG 11 PG13.5
3/8" NPT 1/2" NPT
.39.55
M20
PG16
.51.71 .55.71 .79.98 .951.26 1.261.50 1.461.73
M25 M32 M40 M50 M63
PG21 PG29 PG36 PG42 PG48
3/4" NPT 1" NPT