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Strain Relief Index
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TECHNICAL INFORMATION - PRODUCT SPECIFICATIONS
 
Part Number Index sorted By Thread Types & Sizes:
Metric Threads NPT Threads PG Threads BSPP Threads
(coming soon)
 

NYLON

Pressure rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68 / IP 69 K
Materials:
Fittings: Nylon 6/6, V0: Flame resistant, halogen - and phosphor free, self extinguishing, non-toxic
O-Ring & Seal Ring:
Buna-N/Polyethylene (Viton® optional)

[Applies to pages: 5, 6, 7, 8, 9, 10 & 11]

OPERATING TEMPERATURE

EXPOSURE STATIC DYNAMIC
CONTINUOUS
(NYLON & NICKEL PLATED BRASS)

-40°F to 212°F

(-40°C to 100°C)

-4°F to 176°F

(-20°C to 80°C)

SHORT TERM 248°F (120°C) 212°F (100°C)

NICKEL PLATED BRASS

Pressure rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68
Materials:
Body, Dome Nut: Nickel Plated Brass
Spring (Flex extension): Stainless Steel
Splined Bushing & Form Seal: Nylon 6/6, V0: Flame resistant, halogen - and phosphor free, self extinguishing, non-toxic
O-Ring & Seal Ring: Buna-N/Polyethylene (Viton® optional)

[Applies to pages: 10, 11, 14, 15 & 16]

Selection Criteria For Strain Relief Fittings:

  1. Cable OD (Outside Diameter)

  2. Threads type & size

  3. Nylon, Brass, PVDF, or Stainless Steel

  4. Nut and/or O-Ring/Seal Ring

All approvals


Viton® is a federally registered trademark of DuPont Dow Elastomer.



THREAD SPECIFICATIONS (PITCH & MAJOR DIA.)

NPT THREAD SPECIFICATIONS

THREAD SIZE

1/4" NPT 3/8" NPT 1/2" NPT 3/4" NPT 1" NPT 1-1/4" NPT 1-1/2" NPT 2" NPT

Major Dia. Inches (mm)

.54
(13.72)
.69
(17.15)
.84
(21.34)
1.05
(26.67)
1.32
(33.40)
1.66
(42.16)
1.90
(48.26)
2.38
(60.33)
Pitch (mm) .056"
(1.41)
.056"
(1.41)
.071"
(1.81)
.071"
(1.81)
.087"
(2.21)
.087"
(2.21)
.087"
(2.21)
.087"
(2.21)

Threads per Inch

18 18 14 14 11.5 11.5 11.5 11.5


PG THREAD SPECIFICATIONS

THREAD SIZE

PG 7* PG 9 PG 11 PG 13.5** PG 16 PG 21 PG 29 PG36 PG 42 PG48

Major Dia. Inches (mm)

.49"
(12.5)
.60"
(15.2)
.73"
(18.6)
.80"
(20.4)
.89"
(22.5)
1.11"
(28.3)
1.46"
(37.0)
1.85"
(47.0)
2.13"
(54.0)
2.39"
(59.3)

Pitch (mm)

.05"
(1.27)
.055"
(1.41)
.055"
(1.51)
.055"
(1.51)
.055"
(1.51)
.062"
(1.59)
.062"
(1.59)
.062"
(1.59)
.062"
(1.59)
.062"
(1.59)

 

METRIC THREAD SPECIFICATIONS

THREAD SIZE

M6

M8

M12

M16

M20

M25

M32

M40

M50

M63

Major Dia. Inches (mm)

.24"
(6)
.31"
(8)
.47"
(12)
.63"
(16)
.79"
(20)
.98"
(25)
1.26"
(32)
1.57"
(40)
1.97"
(50)
2.48"
(63)

Pitch (mm)

.04"
(1.0)
.05"
(1.25)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)
.06"
(1.5)

. * PG 7 thread fits 1/4" NPT or 1/2"-20 UNF.

. ** PG 13.5 is also known as PG 13.

.  Taps are readily available. Call for sources and more detailed PG thread specifications.


Metric Thread NPT Thread
• World-wide most commonly used type thread
• Characterized by its major diameter and its pitch
• Designated by the letter M followed by the value of the nominal diameter and the pitch, both expressed in millimetres and separated by the multiplication sign '×' (i.e. M12 x 1.5)
• NPT Thread = National Pipe Thread
• Taper rate for all NPT threads is 1/16
• 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
PG Thread PG Thread
• PG Thread = Panzer-Gewinde
  (also Panzer-Rohr-Gewinde)
• German thread type
• Depth of thread smaller than NPT or Metric, but   larger flank angle
• BSPP Thread = British Standard Pipe Parallel   Thread
• Parallel (straight) thread with a constant   diameter, denoted by the letter G
• Symmetrical V-thread in which the angle between   the flanks is 55° (measured in an axial plane)
• One-sixth of this sharp V is truncated at the top   and the bottom
• Threads are rounded equally at crests and roots   by circular arcs ending tangentially with the   flanks
• The theoretical depth of the thread is therefore   0.64 times the nominal pitch

Part Number Index sorted By Thread Types & Sizes:
Metric Threads NPT Threads PG Threads BSPP Threads
(coming soon)

TORQUE RECOMMENDATIONS FOR STRAIN RELIEF FITTINGS
Torque in inlb (Nm)

METAL STRAIN RELIEF FITTINGS

PLASTIC STRAIN RELIEF FITTINGS

DOME NUTS THREAD AND LOCK NUTS DOME NUTS THREAD AND LOCK NUTS
PG 7, M12x1.5 36.9 (4.17) 55.3 (6.25) 14.4 (1.62) 22.1 (2.50)
PG 9, PG 11, M16, PG 13.5, 3/8" NPT, 1/2" NPT, M16x1.5, M20x1.5 36.9 (4.17) 55.3 (6.25) 22.1 (2.50) 33.2 (3.75)
PG 16, 1/2"NPT-E 44.2 (5.00) 66.4 (7.50) 29.5 (3.33) 44.2 (5.00)
PG 21, PG 29, PG 36, PG 42, PG 48, 3/4"NPT, 1"NPT, 1-1/4"NPT, 1-1/2"NPT, M25x1.5, M32x1.5, M40x1.5, M50x1.5, M63x1.5 59.0 (6.67) 88.5 (10.00) 44.2 (5.00) 66.4 (7.50)

Note: Torque for dome nuts was determined using a metal rod. It may vary for cable, depending on the crush resistance of the cable. We recommend to determine the actual torque empirically, testing the actual cable used. The values shown above are for reference only.  Note: Nylon strain relief fittings installed in a threaded connection and exposed to elevated temperature should be retained with a sealant such as Locktite® to avoid a loose connection when temperature fluctuates.

Nema Ratings IP Ratings

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