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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Hex Socket Pressure Plugs

Dryseal NPTF & Flush PTF

Group codes represented: HSPPS, HSPPB, HSPPSS
Part# examples: 25HSPPS, 37HSPPSF, 100HSPPB, 50HSPPSS

Dryseal NPTF

These plugs, designed for tapered, threaded-hole pipe plug applications, or NPT tapped holes, are tapered 3/4" diameter per foot thread along entire length. Available in heat treated steel, brass, and austenitic stainless steel. Stocked in diameters from 1/16" to 1 1/4".

Nominal Size
D
Threads Per Inch
J
T
G
L
Tightening Torque (Inch-Lbs)
Tap Drill Size*
Nominal Outside Diameter
Hex Socket Size
Key Engage-ment
Wall Thick-ness
Overall Length
Min
Min
Max
Min
1/16
0.312
27
5/32
0.140
0.062
0.324
0.300
150
15/64
1/8
0.405
27
3/16
0.140
0.062
0.324
0.300
250
21/64
1/4
0.540
18
1/4
0.218
0.073
0.457
0.417
600
27/64
3/8
0.675
18
5/16
0.250
0.084
0.520
0.480
1200
7/16
1/2
0.840
14
3/8
0.312
0.095
0.582
0.542
1800
9/16
3/4
1.050
14
9/16
0.312
0.125
0.645
0.605
3000
57/64
1
1.315
11 1/2
5/8
0.375
0.125
0.770
0.730
4200
1 1/8
1 1/4
1.66
11 1/2
3/4
0.437
0.156
0.832
0.792
5400
37.5mm
1 1/2
1.900
11 1/2
1
0.437
0.156
0.843
0.780
6900
43.5mm
2
2.375
11 1/2
1
0.437
0.156
0.906
0.844
8500
2 3/16
* Taper reaming after drilling is recommended for tapping ease and to give fully formed, uniform threads.

Flush PTF

Designed for high pressure flush surface applications, these plugs are tapered 7/8" diameter per foot thread along the entire length to provide flush condition with a standard tapered hole. Available in heat treated steel, brass, and austenitic stainless steel. Stocked in diameters from 1/16" to 3/4".

Nominal Size
D
Threads Per Inch
J
T
G
L
Tightening Torque (Inch-Lbs)
Tap Drill Size*
Nominal Outside Diameter
Hex Socket Size
Key Engage-ment
Wall Thick-ness
Overall Length
Min
Min
Max
Min
1/16
0.307
27
5/32
0.140
0.052
0.250
0.235
150
15/64
1/8
0.401
27
3/16
0.140
0.049
0.250
0.235
250
21/64
1/4
0.529
18
1/4
0.218
0.045
0.406
0.391
600
27/64
3/8
0.667
18
5/16
0.250
0.040
0.406
0.391
1200
9/16
1/2
0.830
14
3/8
0.312
0.067
0.531
0.516
1800
9/16
3/4
1.041
14
9/16
0.312
0.054
0.531
0.516
3000
57/64
1
1.302
11 1/2
5/8
0.375
0.112
0.656
0.641
4200
1 1/8
1 1/4
1.647
11 1/2
3/4
0.437
0.102
0.656
0.641
5400
37.5mm
* Taper reaming after drilling is recommended for tapping ease and to give fully formed, uniform threads.
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