1/8" Staggered
.125 Diameter

1/4" Centers
14 Holes Per Sq. Inch
23% Open

1/8" Staggered
.125 Diameter

3/16" Centers
33 Holes Per Sq. Inch
40% Open

3/16" Staggered

1/4" Centers
51% Open

3/16" Staggered

3/8" Centers
23% Open

---

IPA Perforation Patterns

IPA Numbers

100
106
107
108
109
110
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

Perforations

.020"
1/16"
5/64"
5/64"
3/32"
3/32"
1/10"
1/8"
1/8"
1/8"
5/32"
5/32"
3/16"
3/16"
1/4"
1/4"
1/4"
1/4"
3/8"
3/8"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"

Centers

---
1/8"
7/64"
1/8"
5/32"
3/16"
5/32"
3/16"
7/32"
1/4"
7/32"
1/4"
1/4"
5/16"
5/16"
3/8"
7/16"
1/2"
1/2"
9/16"
5/8"
5/8"
11/16"
3/4"
13/16"
1"

Holes Per Sq. In.

625
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---

Open Area

20%
23%
46%
36%
32%
23%
36%
40%
29%
23%
46%
36%
51%
33%
58%
40%
30%
23%
51%
40%
33%
45%
47%
51%
53%
51%

Width Direction

.530
.500
.286
.375
.400
.500
.360
.333
.428
.500
.288
.375
.250
.400
.200
.333
.428
.500
.250
.333
.400
.300
.273
.250
.231
.250

Length Direction

.465
.435
.225
.310
.334
.435
.296
.270
.363
.435
.225
.310
.192
.334
.147
.270
.363
.435
.192
.270
.334
.239
.214
.192
.175
.192