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TAPERED SERIES
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POLY-CAPS AND POLY-PLUGS
The tapered style can either be used as a cap or plug,
depending on application. Excellent for protecting threads
and keeping unwanted contamination out of pipes, valves,
tubing and most other cylindrical openings. The most
economical solution for protecting standard size threads,
unified threads, N.P.T. and metric size fittings or ports.

Typical wall thickness .032

MATERIAL: LOW DENSITY POLYETHYLENE (RED) CONFORM TO MIL-C-5501/7
PART
NO.
COMMON APPLICATION
AS CAP
AS PLUG
DEPTH
FLANGE DIAM
STD. CTN. QTY.
A
B
C
D
E
F
AS CAP
AS PLUG
in.
mm.
in.
mm
in.
mm.
in.
mm.
in.
mm.
in.
mm.
1
-
-
0.057
1.45
0.122
3.1
0.115
2.92
0.176
4.47
0.403
10.24
0.311
7.9
50000
2
-
-
0.085
2.16
0.145
3.68
0.14
3.56
0.205
5.21
0.375
9.53
0.377
9.58
25000
3
-
-
0.113
2.87
0.183
4.65
0.172
4.37
0.233
5.92
0.379
9.63
0.375
9.53
25000
4
-
-
0.124
3.15
0.196
4.98
0.187
4.75
0.251
6.38
0.377
9.58
0.372
9.45
25,000
5
-
-
0.148
3.76
0.212
5.38
0.209
5.31
0.266
6.76
0.379
9.63
0.435
11.05
45,000
6
-
5/16 st. thrd.
0.177
4.5
0.24
6.1
0.237
6.02
0.293
7.44
0.381
9.68
0.473
12.01
35,000
7
-
0.21
5.33
0.275
6.99
0.265
6.73
0.33
8.38
0.375
9.53
0.47
11.94
30,000
8
15/64 st. thrd.
3/8 st. thrd.
0.24
6.1
0.301
7.65
0.296
7.52
0.368
9.35
0.385
9.78
0.533
13.54
25,000
9
-
1/8 N.P.T.
0.27
6.86
0.331
8.41
0.325
8.26
0.397
10.1
0.377
9.58
0.559
14.2
22,500
10
-
7/16 st. thrd.
0.303
7.7
0.362
9.19
0.357
9.07
0.427
10.9
0.38
9.65
0.579
14.71
20,000
11
3/8 st. thrd.
-
0.327
8.31
0.393
9.98
0.383
9.73
0.46
11.7
0.377
9.58
0.62
15.75
17,000
12
1/8 N.P.T.
1/4 N.P.T./
1/2 st. thrd.
0.362
9.19
0.425
10.8
0.423
10.74
0.488
12.4
0.38
9.65
0.596
15.14
17,000
13
7/16 st. thrd.
-
0.386
9.8
0.448
11.38
0.447
11.35
0.512
13
0.374
9.5
0.625
15.88
15,000
  
14
1/2 st. thrd.
9/16 st. thrd.
0.41
10.41
0.483
12.27
0.474
12.04
0.554
14.1
0.498
12.65
0.719
18.26
9,000
  
15
-
-
0.438
11.13
0.505
12.83
0.495
12.57
0.577
14.7
0.438
11.13
0.75
19.05
9,000
  
16
1/4 N.P.T.
5/8 st. thrd.
0.476
12.09
0.552
14.02
0.529
13.44
0.623
15.8
0.501
12.73
0.752
19.1
7,500
  
17
9/16 st. thrd.
3/8 N.P.T.
0.477
12.12
0.569
14.45
0.548
13.92
0.63
16
0.5
13
0.784
19.91
7,500
  
18
5/8 st. thrd.
-
0.525
13.34
0.606
15.39
0.588
14.94
0.676
17.2
0.529
13.44
0.877
22.28
5,000
  
19
-
-
0.549
13.94
0.634
16.1
0.603
15.32
0.694
17.6
0.495
12.57
0.839
21.31
6,000
  
20
-
3/4 st. thrd.
0.574
14.58
0.658
16.71
0.629
15.98
0.728
18.5
0.492
12.5
0.872
22.15
6,000
  
21
3/8 N.P.T.
-
0.616
15.65
0.695
17.65
0.672
17.07
0.755
19.2
0.5
12.7
0.875
22.23
5,000
  
22
-
1/2 N.P.T.
0.634
16.1
0.722
18.34
0.69
17.53
0.779
19.8
0.62
15.75
0.938
23.83
4,000
  
23
3/4 st. thrd.
-
0.659
16.74
0.758
19.25
0.73
18.54
0.827
21
0.502
12.75
1.004
25.5
4,500
  
24
-
7/8 st. thrd.
0.687
17.45
0.783
19.89
0.752
19.1
0.849
21.6
0.621
15.77
1.032
26.21
6,000
  
25
1/2 N.P.T.
-
0.736
18.69
0.838
21.29
0.8
20.32
0.914
23.2
0.747
18.97
1.024
26.01
5,000
  
26
7/8 st. thrd.
-
0.75
19.05
0.871
22.12
0.812
20.62
0.933
23.7
0.62
15.75
1.123
28.52
5,000
  
27
-
3/4 N.P.T.
0.807
20.5
0.91
23.11
0.867
22.02
0.971
24.7
0.747
18.97
1.13
28.7
4,500
  
27x
-
3/4 N.P.T.
0.809
20.55
0.907
23.04
0.869
22.07
0.974
24.7
0.629
15.98
1.127
28.63
5,000
  
28
-
1-1/16 st. thrd.
0.829
21.06
0.967
24.56
0.893
22.68
1.038
26.4
0.62
15.75
1.153
29.29
5,000
  
29
-
-
0.913
23.19
0.988
25.1
0.984
24.99
1.054
26.8
0.5
12.7
1.253
31.83
2,500
  
30
3/4 N.P.T.
-
0.838
21.29
1.021
25.93
0.955
24.26
1.092
27.7
0.747
18.97
1.243
31.57
1,500
  
31
1-1/16 st. thrd.
-
0.872
22.15
1.08
27.43
0.993
25.22
1.137
28.9
0.749
19.02
1.306
33.17
3,500
  
32
-
1 N.P.T.
1.036
26.31
1.151
29.24
1.098
27.89
1.217
30.9
0.74
18.8
1.497
38.02
2,500
  
33
-
1.063
27
1.217
30.91
1.166
29.62
1.279
32.5
0.743
18.87
1.431
36.35
2,500
  
34
-
1-5/16 st. thrd.
1.16
29.46
1.29
32.77
1.219
30.96
1.351
34.3
0.746
18.95
1.497
38.02
2,500
  
35
1 N.P.T./
1-5/16 st. thrd.
-
1.176
29.87
1.298
32.97
1.236
31.39
1.359
34.5
0.749
19.02
1.497
38.02
1,625
  
36
-
-
1.227
31.17
1.292
32.82
1.289
32.74
1.352
34.3
0.377
9.58
1.504
38.2
2,000
  
37
-
-
1.25
31.75
1.402
35.61
1.312
33.32
1.465
37.2
0.75
19.05
1.625
41.28
1,800
  
38
-
-
1.277
32.44
1.451
36.86
1.346
34.19
1.513
38.4
0.995
25.27
1.751
44.48
1,500
  
39
-
1-1/4 N.P.T.
1.386
35.2
1.531
38.89
1.452
36.88
1.593
40.5
0.741
18.82
1.748
44.4
1,800
  
40
-
1-5/8 st. thrd.
1.451
36.86
1.538
39.07
1.519
38.58
1.596
40.5
0.496
12.6
1.749
44.42
2,500
  
40x
-
-
1.456
36.98
1.541
39.14
1.516
38.51
1.601
40.7
0.748
19
1.753
44.53
1,700
  
41
1-1/4 N.P.T./
1-5/8 st. thrd.
1-3/4 st. thrd.
1.491
37.87
1.616
41.05
1.559
39.6
1.683
42.8
0.739
18.77
1.874
47.6
1,500
  
42
-
-
1.559
39.6
1.694
43.03
1.627
41.33
1.757
44.6
0.743
18.87
2.004
50.9
1,200
  
42x
-
-
1.725
43.82
1.76
44.7
1.79
45.47
1.815
46.1
0.405
10.29
1.995
50.67
2,000
  
43
-
1-1/2 N.P.T./
1-7/8 st. thrd.
1.672
42.47
1.803
45.8
1.741
44.22
1.873
47.6
0.739
18.77
2.05
52.07
1,200
  
44
1-1/2 N.P.T./
1-7/8 st. thrd.
-
1.726
43.84
1.871
47.52
1.806
45.87
1.933
49.1
0.995
25.27
2.109
53.57
900
  
45
-
-
1.745
44.32
1.934
49.12
1.815
46.1
2.01
51.1
0.984
24.99
2.123
53.92
900
  
46
-
-
1.831
46.51
2.011
51.08
1.903
48.34
2.076
52.7
0.995
25.27
2.244
57
850
  
47
-
-
1.899
48.23
2.024
51.41
1.982
50.34
2.115
53.7
0.995
25.27
2.21
56.13
800
  
48
-
-
1.924
48.87
2.067
52.5
1.998
50.75
2.14
54.4
0.742
18.85
2.32
58.93
1,000
  
49
-
2-1/4 st. thrd.
2.001
50.83
2.097
53.26
2.069
52.55
2.184
55.5
0.994
25.25
2.5
63.5
700
  
50
-
2 N.P.T.
2.145
54.48
2.174
55.22
2.215
56.26
2.26
57.4
0.491
12.47
2.473
62.81
1,200
  
51
2-1/4 st. thrd.
-
2.086
52.98
2.275
57.79
2.162
54.91
2.343
59.51
1.000
25.4
2.64
67.06
600
  
52
-
-
2.054
52.17
2.3
58.42
2.134
54.2
2.38
60.45
0.994
25.25
2.481
63.02
700
  
53
2 N.P.T.
-
2.22
56.39
2.376
60.35
2.301
58.45
2.457
62.41
0.995
25.27
2.621
66.57
600
  
54
2-1/2 st. thrd.
-
2.235
56.77
2.54
64.52
2.4
60.96
2.6
66.04
1.000
25.4
2.812
71.42
600
  
55
-
-
2.412
61.26
2.569
65.25
2.486
63.14
2.632
66.85
0.745
18.92
2.738
69.55
700
  
56
-
-
2.239
56.87
2.587
65.71
2.306
58.57
2.654
67.41
0.997
25.32
2.747
69.77
750
  
57
-
-
2.395
60.83
2.69
68.33
2.475
62.87
2.75
69.85
1.000
25.4
2.875
73.03
600
  
58
-
-
2.499
63.47
2.63
66.8
2.567
65.2
2.679
68.05
0.997
25.32
2.874
73.00
650
  
59
-
2-1/2 N.P.T.
2.55
64.77
2.75
69.85
2.648
67.26
2.796
71.02
0.746
18.95
3.008
76.4
600
  
60
-
3 st. thrd.
2.802
71.77
2.93
74.42
2.862
72.69
2.983
75.77
0.749
19.02
3.265
82.93
500
  
61
2-1/2 N.P.T.
-
2.69
68.33
2.931
74.45
2.759
70.08
3.003
76.28
1.000
25.4
3.115
79.12
500
  
62
-
-
2.885
73.28
3.13
79.5
3.002
76.25
3.145
79.88
0.743
18.87
3.363
85.42
500
  
63
-
-
2.929
74.4
3.171
80.54
3.004
76.3
3.251
82.58
0.999
25.37
3.394
86.21
400
  
64
-
-
3.023
76.78
3.302
83.87
3.099
78.71
3.377
85.78
0.993
25.22
3.496
88.8
400
  
65
-
3 N.P.T.
3.256
82.7
3.383
85.93
3.334
84.68
3.461
87.91
0.752
19.1
3.633
92.28
400
  
66
3 N.P.T.
-
3.214
81.64
3.49
88.65
3.291
83.59
3.6
91.44
0.999
25.37
4.009
101.83
300
  
67
-
-
3.403
86.44
3.548
90.12
3.468
88.09
3.62
91.95
0.746
18.95
3.991
101.37
350
  
68
-
-
3.608
91.64
3.73
94.74
3.68
93.47
3.8
96.52
0.75
19.05
4.000
101.6
300
  
69
3-1/2 N.P.T.
3-1/2 N.P.T.
3.717
94.41
3.855
97.92
3.806
96.67
3.938
100.03
0.745
18.92
4.15
105.41
300
  
70
-