Strain Relief Fittings

Strain Relief Fittings - Technical Information


View Strain Relief Section
 
Nylon

Pressure Rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68 / IP 69K

Materials:
Fittings: Nylon 6/6 -
• V0 Rated - Flame resistant, Halogen and Phosphorous Free, Self-extinguishing, Non-toxic, Fungus resistant
• Form Seal: Buna-N
• Clamping Insert: Nylon
• Optional O-Ring: Buna-N, FPM or Silicone
• Optional Seal Ring: Polyethylene or Fiber-Reinforced Plastic

Operating Temperature:
Nylon Fittings: -40 ºF to 212 ºF (-40 ºC to 100 ºC)
Nylon Fitting w/ Aluminum Clamp: -4 ºF to 158 ºF (-20 ºC to 70 ºC)

Available Colors:
• Black (RAL 9005)
• Gray (RAL 7035)
• Blue (RAL 5012) (upon request)

All Black Nylon Fittings use the new UL f1 (746C) material. These products are ideally used in Photovoltaic / Solar / Outdoor applications requiring more (UV / Ozone Stable) material.


PVDF

Pressure Rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68 / IP 69K

Materials:
• V0 Rated - Flame resistant, Halogen & Phosphorous Free, Self-extinguishing, Non-toxic, Fungus resistant
• Form Seal: FPM
• Clamping Insert: PVDF
• Optional O-Ring: FPM

Resistant to:
• Acid
• Salt solution
• Oxydant
• Halogens
• Alcohols
• Chlorinated solvent
• Aliphatic hydrocarbons
• Petrol

Operating Temperature:
-31 ºF to 302 ºF (-35 ºC to 150 ºC)


Stainless Steel

Pressure Rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68 / IP 69K

Materials:
• Fittings: 303 Stainless Steel or 316L Stainless Steel
• Form Seal: Buna-N (NBR) or FPM)
• Clamping Insert: PA (Nylon) or PVDF
• O-Ring: Buna-N (FPM), Viton® or Silicone

Operating Temperature:
Buna-N: -40ºF to 212ºF (-40ºC to 100ºC)
PVDF: -31ºF to 302ºF (-35ºC to 150ºC)

Nickel Plated Brass

Pressure Rating:
150 PSIG (10 BAR) NEMA 4x, 6 (Submersible) & 12 - IP 68 / IP 69K

Materials:
• Fittings: Nickel Plated Brass
• Spring (Flex Extension): 304 Stainless Steel
• Form Seal: Buna-N (NBR) or FPM)
• Clamping Insert: PA (Nylon) or PVDF
• O-Ring: Buna-N (NBR) FPM or Silicone optional)
• Optional Seal Ring: Polyethylene or Fiber-Reinforced Plastic

EMI Feed-Through
Clamping Insert: Metal Coated Nylon

Operating Temperature:
Buna-N: -40 ºF to 212 ºF (-40 ºC to 100 ºC)
PVDF: -31 ºF to 302 ºF (-35 ºC to 150 ºC)

Nylon Splines 6/6: V0 rated - Flame resistant, halogen and phosphorous free, self extinguishing, non-toxic, fungus resistant


Nickel Plated Brass - WADI
Mini WADI (Buna-N / TPE) -4ºF to 212ºF
(-20ºC to 100ºC)
Mini WADI FPM) -13ºF to 392ºF
(-25ºC to 200ºC)
WADI XL (Buna-N)

G": -4 ºF to 212 ºF (-20 ºC to 100 ºC)

Metric: -40 ºF to 212 ºF (-40 ºC to 100 ºC)


Adapter, Reducer, Enlarger
Nylon/Polypropylene -4 ºF to 176 ºF
(-20 ºC to 80 ºC)
Nickel Plated Brass
W/O-Ring
-4 ºF to 176 ºF
(-20 ºC to 80 ºC)
303/316L Stainless Steel w/ Buna-N O-Ring (-4º to 203ºF)
(-20ºF to 95ºC

Insert Materials
Buna-N/TPE
- 40 ºF to 212 ºF (- 20 ºC to 100 ºC)
Elastomer - 40 ºF to 212 ºF (- 40 ºC to 100 ºC)
FPM -13ºF to 392ºF (-25ºC to 200ºC)

Silicone

-76ºF to 482ºF (-60ºC to 250ºC)

O-Ring & Seal Ring Materials
Buna-N (NBR)
-22ºF to 248ºF
(-30ºC to 120ºC)
FPM -40ºF to 392ºF
(-40ºC to 200ºC)

Silicone (VMQ)

-76ºF to 482ºF
(-60ºC to 250ºC)
Polyethylene -22ºF to 158ºF
(-30ºC to 70ºC)

Fiber-reinforced Plastic

-40ºF to 572ºF
(-40ºC to 300ºC)


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)
.056"
(1.41)
.056"
(1.41)
.056"
(1.41)
.056"
(1.41)
.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)

BSPP (G) THREAD SPECIFICATIONS

THREAD SIZE

G 2-1/2"

G 3"

G 4"

Major Dia. Inches (mm)

2.96 (75.18) 3.46 (87.88) 4.45 (113.03)

Pitch (mm)

.09 (2.31) .09 (2.31) .09 (2.31)

Threads per Inch

11 11 11

 


. * 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

TORQUE RECOMMENDATIONS FOR STRAIN RELIEF FITTINGS
Torque in Inch Pounds - in lb (Newton Meters - Nm)

Sizes

PLASTIC STRAIN RELIEF FITTINGS

METAL STRAIN RELIEF FITTINGS

DOME NUTS THREAD AND LOCK NUTS DOME NUTS THREAD AND LOCK NUTS
M 6 17.7 (2)
M 8 17.7-26.6 (2-3)
PG 7, M12x1.5 14.4 (1.62) 22.1 (2.5) 36.9 (4.17) 55.3 (6.25)
PG 9, PG 11, M16, PG 13.5, 3/8" NPT, 1/2" NPT, M16x1.5, M20x1.5 22.1 (2.5) 33.2 (3.75) 36.9 (4.17) 55.3 (6.25)
PG 16, 1/2"NPT-E 29.5 (3.33) 44.2 (5) 44.2 (5) 66.4 (7.5)
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 44.2 (5) 66.4 (7.5) 59 (6.67) 88.5 (10)

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.

Custom Drilling Solutions!

  • Any special insert hole or profile configuration is available for a minimum order of 1,000 pieces.
  • No Charge Manufacturing Fee - In 12-14 weeks or a one time Expedite Fee reducing manufacturing to 6-8 weeks.
  • For small quantities we suggest drilling or machining the inserts yourself

    Drilling/Machining guidelines:
  • We suggest drilling the frozen solid insert.
  • Drill holes by using a standard high-speed steel drill bit of the proper size at approx. 2500 RPM.
  • Drill holes with insert installed in Strain Relief Fitting as a fixture.
  • Keep a minimum distance of 1 mm (.04 in) between holes.
  • The outside holes can be located right against the lip of the strain relief body, as sufficient insert material remains between the hole and the body wall due to the design of the cord grip.
Important: Design Parameters: Cable diameter should not be less than 80% of hole diameter and the difference between hole and cable diameter should never exceed .04" (1 mm). The Multi Cable fittings will meet NEMA 4x = IP65 if the design parameters are complied with.

To verify a submersible NEMA 6= IP68 application, the final assembly of cables and fittings must be tested by the customer or submitted at the customer's expense to an independent test lab.

View Strain Relief Section

Nema Ratings IP Ratings