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



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