Cable GlandThreads Comparison - Mencom Corporation
[Pages:1]THREAD types COMPARISON for CAble Glands
NPT vs metric vs PG
GENDER
Male
External Thread
Female
Internal Thread
HANDEDNESS
Right-hand Left-hand
PITCH/TPI
Pitch
1" Threads per Inch
Basics of Thread
ANGLE
Taper Angle
Thread Angle
Flank
DESIGN
Parallel
Tapered
DIAMETER
Depth Minor diameter
Pitch diameter
CREST/ROOT
Pitch
Major diameter Pitch diameter Minor diameter
Crest Root
Major diameter
National Pipe Tapered
NPT Threads
"- NPT Nominal
Pipe Size
TPI
Thread size
1/16"-27 NPT 1/8"-27 NPT 1/4"-18 NPT 3/8"-18 NPT 1/2"-14 NPT 3/4"-14 NPT 1"-11 / NPT 1.25"-11 / NPT 1.5"-11 / NPT 2"-11 / NPT
A major diameter in inches [mm]
0.313 [7.938] 0.405 [10.287] 0.54 [13.716] 0.675 [17.145] 0.84 [21.336] 1.05 [26.67] 1.315 [33.401] 1.66 [42.164]
1.9 [48.26] 2.375 [60.325]
B Pitch in inches [mm]
0.037 [0.947] 0.037 [0.947] 0.056 [1.41] 0.056 [1.41] 0.071 [1.814] 0.071 [1.814] 0.087 [2.208] 0.087 [2.208] 0.087 [2.208] 0.087 [2.208]
C TPI [Thread per inch]
27 27 18 18 14 14 11 / 11 / 11 / 11 /
- Taper rate for all NPT threads is 1/16
- The flank angle is 60?
- The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to straight thread fittings
B A
C 60?
1? 47'
International Organization for Standardization (ISO)
Metric Threads
M x Major Diameter
Pitch
fine Thread size
M6 x 1.0 M8 x 1.25 M12 x 1.5 M16 X 1.5 M20 X 1.5 M25 X 1.5 M32 X 1.5 M40 X 1.5 M50 X 1.5 M63 X 1.5
A major diameter in inches [mm]
0.24 [6] 0.31 [8] 0.47 [12] 0.63 [16] 0.79 [20] 0.98 [25] 1.26 [32] 1.57 [40] 1.97 [50] 2.48 [63]
B Pitch in inches [mm]
0.04 [1.0] 0.05 [1.25] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5] 0.059 [1.5]
C Through Hole in inches [mm]
0.251 [6.4] 0.33 [8.4] 0.492 [12.5] 0.63 [16] 0.79 [20] 0.98 [25] 1.26 [32] 1.57 [40] 1.97 [50] 2.48 [63]
B
60?
- The most commonly used thread type in the world
- The flank angle is 60?
A
C
- Female and Male thread are both
parallel
Thread size
PG 7 PG 9 PG 11 PG 13/13.5 PG 16 PG 21 PG 29 PG 36 PG 42 PG 48
Panzer-Gewinde (also Panzer-Rohr-Gewinde)
PG Threads
PG Nominal Thread Size
A major diameter in inches [mm]
0.49 [12.5] 0.60 [15.2] 0.73 [18.6] 0.80 [20.4] 0.89 [22.5] 1.11 [28.3] 1.46 [37] 1.85 [47] 2.13 [54] 2.39 [59.3]
B Pitch in inches [mm]
0.05 [1.27] 0.056 [1.41] 0.056 [1.41] 0.056 [1.41] 0.056 [1.41] 0.062 [1.59] 0.062 [1.59] 0.062 [1.59] 0.062 [1.59] 0.062 [1.59]
- German thread type
- Depth of thread smaller than NPT or Metric, but larger flank angle (80?)
- Female and Male thread are both parallel
B
80?
A
C Through Hole in inches [mm]
0.50 [12.7] 0.606 [15.4] 0.74 [18.8] 0.8149 [20.7] 0.897 [22.8] 1.12 [28.6] 1.47 [37.4] 1.87 [47.5] 2.14 [54.5] 2.35 [59.8]
C
SOURCES
For more information, visit
Mencom, the industry leader in Panel Interface Connectors, has well over 3,000 designs in producon that provide safety, convenience and flexibility for programmers and trouble-shooters. Also we have a team of engineers with decades of experience. Combined with a progressive manufacturing facility, we are not only ready to provide a soluon but also able to assist challenging connecvity issues from small changes to custom terminaons & assemblies with affordable costs and fast turnaround.
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