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SUPERLOK® Tube fittings > Technological information



Technological Information
Hardness Limitation

Generally, heat treated tubing shall be used in Metal tubing so that can be used properly with SUPERLOK tube fitting.
Hardness of stainless steel tubing is being limited below HRb90 but large majority of users are using the hardness of tube limited below HRb80. On the other hand, it is actually economical to use tubing by lowering the hardness of tubing because the assembly is easy and tubing can be bent easily. Therefore, SUPERLOK encourage customers to use tubing with the hardness below HRb 80. This is for customer's convenience and perfect leakage prevention in operation.

 
Compatibility

SUPERLOK is manufactured in order to be compatible with other firm's tube fitting from the beginning of design so that can warrant 100% confidence in case of being made under the mutual control of tolerance and hardness with other firm. But it is safe to operate with only SUPERLOK products if possible.

 
Application Gas System

SUPERLOK is appropriate as the standard for making use of gas system, but potential leakage can be prevented by the implenentation of the below standards.

Tubing standard in gas system
(Apply to the installation of general system)

1. The hardness of tubing shall be less than those of fitting.
2. Surface of tubing must be free from scar, defect, pollution and etc. Shall be flexible and expansion of tubing should be easy.
3. Refer to able 2, 3, 4, 5 for tubing choice of suitable gas system.
4. End part shape of tubing should not be deformed especially. (For example, the ending part of tubing should not be an oval.)
5. End of tubing must be perpendicular to the center line of tubing and be deburred. For these reason, tube cutting machine must have a sharp blade and deburring tools should be used.
6. Firm connection shall be performed. Insufficient connection is the main cause of leakage and failure of system.
7. Do not bend tubing after inserting tubing into the fitting.
8. Observe the procedure of operation which is suggested by our firm.
9. Use minimum wall thickness of below table in order to secure maximum safety in gas system.

 
Application to Cryogenic and High Temperature System

SUPERLOK Tube Fitting is suitable for vacuum system as well as the situation of high pressure and from cryogenic condition to high temperature. SUPERLOK Tube Fitting has been tested repeatedly under various conditions.

Maximum Temperature by Materials
Aluminum 400 °F 204 °C
Copper 400 °F 204 °C
Steel 375 °F 191 °C
SUS304 1000 °F 538 °C
SUS316 1200 °F 649 °C
MONEL 800 °F 427 °C

Please refer to ASME B31.3-1993 concerning the detailed information about the maximum & minimum temperature of various materials.

 
THREADS
1. NPT (National Pipe Thread)
Thread angle 60°
Tapered angle 1°47'
Manufactured by the standard of ANSI B2.1
2. ISO 7/1 Taperad Thread
Thread angle 55°
Tapered angle 1°47'
Equivalent to the standard of DIN2999 BS21(BSPT) and JIS B0203(PT).
3. ISO 228/1 Parallel Thread
Thread angle 55
Equivalent to the standard of BS 2779 (BSPP), JIS B0202 (PF). As the thread in accordance with ISO 228/1 cannot be sealed perfectly, the sealing shall be done by the following method. Use a gasket or O-Ring to seal.
1. Bonded Washer Seal
Be sealed by contacting the inclined surface of the hex body of male thread to the surface of the female thread. In case of sealing, a washer which composed of metal and elastic material is located at the center of tapered surface.
2. Metal Gasket Seal
A Metal gasket(generally copper) is sealed between the body of male thread and the surface of female thread.
3. Metal Gasket Seal
This is a method to insert a gasket into the flat surface of thread's inside. The sealing shall be completed with pushing the gasket by male thread surface.
4. UNF Thread
Thread angle 60
This is classified into UN, UNC and UNF. The standard is classified by the diameter of thread and the number of threads per inch.
 
ISO Internal parallel pipe Thread
SUPERLOK Designator ISO Female ParallelPipe Size(inch) Minimum Full Thread Depth B (inch) Thread Minor Diameter D(inch) Minimum Flat Diameter for (1) & (2) C(inch) Minimum Flat Diameter for Positionable Thread C(inch)
2G 1/8 0.31 0.337/0.348 0.59 0.68
4G 1/4 0.47 0.450/0.468 0.75 0.90
6G 3/8 0.47 0.586/0.606 0.91 1.04
8G 1/2 0.55 0.733/0.755 1.06 1.26
12G 3/4 0.63 0.949/0.971 1.30 1.62
16G 1 0.71 1.193/1.218 1.57 1.91
Note : ISO positionable elbows and tees are compatible with female ports having BS 2779 threads.
 
Technological Data
Table 2 Stainless Steel Tubing
Stainless Steel tubing which is high quality (such as 304, 316, 316L and so on), fully annealed and seamless or welding, ASTM A269, A213 or equivalent.
STAINLESS STEEL FRACTIONAL TUBE
Tube O.D. (inch) TUBE WALL THICKNESS (inch)
 0.010    0.012  0.014  0.016  0.020  0.028  0.035  0.049  0.065  0.083  0.095  0.109  0.120
 1/16    5600  6800  8100  9400  12000                
 1/8    8500  10900            
 3/16    5400  7000  10200          
 1/4    4000  5100  7500  10200        
 5/16    4000  5800  8000        
 3/8    3300  4800  6500        
 1/2    2600  3700  5100  6700      
 5/8    2900  4000  5200  6000    
 3/4    2400  3300  4200  4900  5800  
 7/8    2000  2800  3600  4200  4800  
 1    2400  3100  3600  4200  4700
  = Tubing working pressure(psi)
 
STAINLESS STEEL METRIC TUBE
Tube O.D. (inch) TUBE WALL THICKNESS (inch)
 0.71    0.89  1.00  1.25  1.50  1.65  2.00  2.11  2.41  2.50  2.77  3.00  3.05
 3    10800  13800  15300                    
 4    7900  10100  11500  14400                  
 6    5000  6500  7400  9400  11500  12700              
 8    4700  5800  6800  8400  9300              
 10    3700  4200  5300  6500  7300              
 12    3000  3400  4400  5300  5900  6800  7200          
 16      2500  3200  3900  4300  5300  5700  6600  6800      
 18        2800  3400  3800  4700  5000  5800  6000  6700    
 20        2500  3000  3400  4200  4400  5100  5300  6000    
 22        2300  2800  3000  3800  4000  4600  4800  5400    
 25        2000  2400  2700  3300  3500  4000  4200  4700  5100  5200
  = Tubing working pressure(psi)
 
Allowable stress value between -20°F and 100°F (-28.9°C ~ 37.8°C ) is 19,500 psi
Safety factor is 4 (Ultimate tensile strength is 75,000 psi)
The above data are based on the minimum wall thickness and the maximum O. D. allowed by and under the standard of ASTM A269. The dimensions are not considered to erosion or corrosion.