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Tube Cap

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  • Dimensions
  • How To Order
  • Tubing & Pipe end Thread Information
  • Features

Dimensions


 

Connects Fractional Tube
Part No.Tube OD
T
Dimensions (mm)
hHFIL
inchmminchmminchmm
UC-021/83.177/1611.117/1611.1112.713.520.1
UC-033/164.767/1611.111/212.7013.714.721.3
UC-041/46.351/212.709/1614.2815.216.023.3
UC-055/167.939/1614.285/815.8716.317.024.4
UC-063/89.525/815.8711/1617.4616.818.325.7
UC-081/212.7013/1620.637/822.2222.919.129.2
UC-105/815.8715/1623.81125.4024.419.830.0
UC-123/419.051-1/1626.981-1/828.5724.421.331.5
UC-147/822.221-3/1630.161-1/431.7525.923.934.0
UC-16125.401-3/834.921-1/238.1031.226.238.4
UC-201-1/431.751-3/444.451-7/847.6241.131.253.3
UC-241-1/238.102-1/853.972-1/457.1550.037.364.5
UC-32250.802-3/469.85376.2067.649.386.6


Connects Metric Tube
Part No.Tube OD
T
Dimensions (mm)
hHFIL
mmmmmm
UC-M03311.1111.1112.913.520.1
UC-M04411.1112.7013.714.721.3
UC-M06614.2814.2815.315.723.1
UC-M08815.8715.8716.217.024.5
UC-M101017.4619.0517.219.026.6
UC-M121222.2222.2222.819.029.1
UC-M151523.8125.4024.419.829.9
UC-M161623.8125.4024.419.829.9
UC-M181826.9830.1624.421.331.4
UC-M202030.1631.7526.023.934.0
UC-M222230.1631.7526.023.934.0
UC-M252534.9238.1031.326.238.5
UC-M282841.2747.6336.627.748.5
UC-M303047.6350.8039.631.853.4
UC-M323247.6350.8042.032.855.8
UC-M383855.5657.1549.437.865.4
Dimensions are for reference only and are subject to change without prior notice. E is minimum opening. F and L are typical finger tight.


Installation Instruction 


1. Insert tube end into the cap to bottom on the shoulder of the cap. 

2. Finger-tighten the nut 

3. Wrench-tighten the nut 1-1/4 turns, holding the body with a backup wrench, or vice. 


Note 

Tighten 3/4 turn for 1/16, 1/8, and 3/16 inch and 2, 3, and 4 mm size cap. 

How To Order

Fractional(Inch)Tube fittings 

UNILOK fractional(inch) size tube fittings are ordered by part number as shown below. 

Example: The following part number, UMC-0804N-SS, is designated for Male Connector, 1/2"OD x 1/4" Male NPT, 316SS.


U

C

-

08

04

N

-

SS

UNILOK
Tube Fittings

Fitting Type

Tube O.D.

Pipe Size

Thread Type

Material

NACE

Plating
Only for Brass &
Carbon Steel

 Fractional(inch) Tube Designation
Tube O.D.inch1/161/83/161/45/163/81/25/83/47/811-1/81-1/41-1/22
mm1.503.174.766.357.939.5212.7015.8819.0522.2225.4028.5731.7538.1050.80
Designator010203040506081012141618202432
Pipe Size DesignationMaterial Designation
Pipe Size1/81/43/81/23/411-1/41-1/22DesignatorMaterials
Designator020406081216202432SS316SS
BSBrass
Thread Type DesignationCSCarbon Steel
DesignatorThread TypeMOAlloy 400
NNPTNational Standard Pipe ThreadIN60Alloy 600
RISO 7/1Taper Pipe ThreadIN65Alloy 625
GISO 228/1Parallel Pipe ThreadIN85Alloy 825
USAE J1926Straight Thread BossHCAlloy C-276
SSAE J51437° FlaredTFPTFE
T Tube EndDPDuplex
None UNILOK PortSDSuper Duplex
6MO6MO/SMO254
NACE Application Plating Designation
None- NPNickel
NNACE Application BPBlack Phosporized



Metric Tube Fittings 

UNILOK metric size tube fittings are ordered by part number as shown below. 

Example: The following part number, UMC-M1204R-SS is designated for Male Connector, 12mmOD x 1/4" Male BSPT, 316SS. 


UC-M1204R-SS  
UNILOK
Tube Fittings
Fitting TypeTube O.D.Pipe SizeThread TypeMaterialNACE

Plating
Only for Brass &
Carbon Steel

Metric Tube O.D Designation
Tube O.D.mm23468101214151618202225283238
DesignatorM02M03M04M06M08M10M12M14M15M16M18M20M22M25M28M32M38

Tubing & Pipe end Thread Information

Tubing Information  

The proper selection of tubing is essential to assure maximum fitting reliability and performance. When choosing tubing material, size and wall thickness, consider system’s pressure, flow rate, temperature, environment and compatibility with great care. 


Maximum Allowable Working Pressure 

Stainless Steel Tubing 

Fully annealed and seamless stainless steel tubing to comply with ASTM A269 or equivalent. Hardness should not exceed Rb 80. Tubing should be free from scratched and suitable for bending and flaring. 


Fractional(Inch) Tubing
Tube O.D.
(inch)
Tube Wall Thickness (inch)
0.0280.0350.0490.0650.0830.0950.1090.1200.1340.1560.188
1/8855010950         
3/165500710010300        
1/441005200760010300   Working pressure in psig
5/16 410059008100       
3/8 335048506550       
1/2 2650375051506750      
5/8  2950405052506050     
3/4  24503350425049505850    
4/8  20502850365042504850    
1   24003100360042004700   
1-1/4    240028003300360041004900 
1-1/2     230027003000340040004900
2      20002200250029003600
Metric Tubing
Tube O.D.
(inch)
Tube Wall Thickness (inch)
0.81.01.21.52.02.22.53.03.54.04.5
39700          
4790011500         
645006100785010300   Working pressure in psig
8 450056507500       
10 3500435058008400      
12 2900360048006800      
14 23002900400055006250     
15 2002750365052005800     
16  24503350480053505800    
18  21502950420046505350    
20  20302600375042004800    
22  17502300335037504350    
25    2900335037504650   
38     203023002900350039004500
For gas service application, use only tubing with wall thickness on outside of gray areas.
Allowable stress of 20000 psig between -29°C(-20°F) and 37°C(100°F) based on ultimate tensile strength to be 74000 psig.


Copper Tubing 

Fully annealed and seamless stainless steel tubing to comply with ASTM B75 or equivalent. Hardness should not exceed Rb 60. 


Fractional(Inch) Tubing 

Tube O.D.
(inch)
Tube Wall Thickness (inch)
0.0280.0350.0490.0650.0830.0950.1090.120
1/41300160025003500    
3/8 100016002200    
1/2 800110016002200   
5/8  900120016001900  
3/4  7001000130015001800 
1  500700900110013001500


Metric Tubing 

Tube O.D.
(inch)
Tube Wall Thickness (inch)
1.01.52.02.53.0
623503670   
817102680Working pressure in psig 
1013502090   
12110017102350  
20 99013501710 
25 780106013501640

For gas service application, use only tubing with wall thickness on outside of gray areas. Allowable stress of 6000 psig between -29℃(-20℉) and 37℃ (100℉) based on ultim ate tensile strength to be 30000 psig. 


Monel Tubing 

Fully annealed and seamless stainless steel tubing to comply with ASTM B165 or equivalent. Hardness should not exceed Rockwell Rb 75. 


Fractional(Inch) Tubing 

Tube O.D.
(inch)
Tube Wall Thickness (inch)
0.0350.0490.0650.0830.0950.1090.120
1/4480070009500    
3/8310044006100 Working pressure in psig
1/2230032004400    
3/4 2200300040004600  
1  22002900340039004300

For gas service application, use only tubing with wall thickness on outside of gray areas. Allowable stress of 6000 psig between -29℃(-20℉) and 37℃ (100℉) based on ultimate tensile strength to be 30000 psig. 


Determination Factors of MAWP at High Temperature Application 

To determine allowable working pressure at elevated temperature, multiply allowable working pressure and factors which are shown in the table. 

TemperatureMaterials
316SSCopperMonel
901941.00.80.88
2003920.960.50.79
3105900.85-0.79
4808020.79-0.75
5369960.76--
64412270.37--

Example: 316SS Tubing, 1/2"ODx0.049"WT at 310℃ AWP: 3750 x 0.85 = 3187 psig.  

* MAWP: Maximum Allowable Working Pressure 

* AWP: Allowable Working Pressure  


Pipe End Thread Information 

The end connections with the lower pressure rating is the determining factor of pressure rating for the fittings with both UNILOK tube ends and pipe thread ends . 


Pressure Rating for Pipe End Thread 


Tapered Pipe Threads - NPT or ISO 7/1(BSPT)
Allowable pressure ratings for male and female threads are based on ASME B31.3 at ambient temperature.
ISO 228/1 Parallel Thread (BSPP)
The pressure ratings are at ambient temperature.
Pipe Size316SS316SSUNILOK
Desig nator
Male
Pipe Size
316SSUNILOK
Designator
MaleFemaleMaleFemalebarpsig
inchbarpsigbarpsigpsigbarpsig1/83154568-02G
1/1676011000460670055002303300-01N/R1/43154568-04G
1/869010000440650050002203200-02N/R3/83154568-06G
1/45508000450660040002203300-04N/R1/21602320-08G
3/85407800360530039001802600-06N/R
1/25307700330490038001602400-08N/R
3/45007300320460036001602300-12N/R
13705300300440026001502200-16N/R
1-1/44106000350500030001702500-20N/R
1-1/23405000310460025001502300-24N/R
22703900270390019001301900-32N/R


O-Seal Fittings 

Rated to 206 bar (3000 psig) for 316SS fittings up to 1 inch and 25mm 


Kinds of Pipe End Thread

NPT Pipe Thread
NPT (National Pipe Thread) is based on ANSI B1.20.1.

ISO 7/1 Tapered Pipe Thread
International Organization for Standard (ISO 7/1) Tapered (PT) Equivalent to BSPT (British Standard Pipe Taper Thread), DIN 2999, JIS B0203

    

ISO 228/1 Parallel Pipe Thread
International Organization for Standard (ISO 228/1) Parallel(PF) Equivalent to BSPP (British Standard Pipe Parallel Thread), DIN ISO228/1, JIS B0202 Gasket or O-ring is normally used to seal into the parallel female threaded components.

  

Features

Gaugeability

UNILOK tube fittings are produced with exact and tight tolerances. Without such close tolerances, proper interaction among the nut, ferrules, and body would not occur.


Corrosion Resistance

UNILOK ferrules have the strongest corrosion resistance due to our own special hardening process. 

This has been proven in various industrial areas over several decades.


Interchangeability

UNILOK tube fittings can be interchanged with tube fittings manufactured to international standards.


Less Torque and Anti-Distortion

When the nut is tightened, both ferrules are driven forward between the nut and the body. 

This axial movement doesn't transfer any torque from the fitting to the tubing when the original tubing's mechanical properties are maintained.




UNILOK Tube Fittings Installation Instruction 

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