HCG Hex Coupling Stainless Steel 316L Tube Fitting Plumbing Fitting
High Quality Sanmin
Tube Fittings Description
The tube fitting is a mechanism used both to seal and to grip
tubing . The mechanical advantage and geometry of this kind of
fitting produces a leak – tight assembly .
To assemble , simply insert the tube into the complete assembly
until the tube bottoms – out against the shoulder of the fitting
body . The two ferrules are driven forward between the nut and
fitting body using the mechanical force created by rotating the nut
clockwise . The Back ferrule is driven against the tapered rear of
the front ferrule is driven by force into the tapered mouth of the
The rear ferrule is swaged radially inwards on the tube while
lifting the front ferrule out to form a full – faced seal on the
tapered surface of the body .
The 1-1/4 Turn of the nut from the hand tight position assures
consistent drive of the sealing members . This ensures an effective
seal against high pressure as well as ultra high vacuum conditions
Fittings are supplied assembled and finger tight . Disassembly
before use can allow the entry of dirt or other particles
1 . Insert the tubing into the fitting
Check That the tube rests firmly on the fitting shoulder and that
the nut is finger tight , At this point it is recommended that a
scribe mark be drawn on the hex of the extending onto the fitting
body . This mark will serve as an indicator for the starting point
and proper pull – up .
2 Tighten the nut
1-1/4 Turns of the nut are required for 1/4” (6mm) and higher ( See
Fig . A )
3/4 Turn of the nut is required for 3/16” (4mm) and lower ( See
Connections may be disconnected and remade repeatedly , without
loss of leak tight seal .
1. Before disconnecting , Mark the position of the nut inrelation to
the fitting body .
2. To reassemble , use a wrench to tighten nut to original position
3. Tighten slightly with wrench until a slight rise in torque is
To attain a leak free connection , the tubing must be cut squarely
. A good quality tube cutter with the appropriate blade for the
tubing material is recommended .
Do not try to reduce the time of cutting by taking deep cuts with
each turn the cutter . This will work harden the tube .
The end of the tube must be deburred to avoid damage to the fitting
and to ensure that the rube reaches the bottom of the fitting .
Do not hold the tube in a vise in the place where it will be
inserted into the fitting ( the vise will leave a mark on the tube
that may cause leaks , and might cause ovality ).
Scratches on the tube might cause leaks . it is , therefore ,
important to handle the tube carefully to reduce the risk of leaks
If using copper tubing from a roll , hold the end of the tube and
roll the roll outwards allowing the tubing to lie on a flat surface
In applications where severe conditions and high pressure exist ,
we recommend the following installation procedures :
1. Check that the nut is finger tight
2. Insert the tube ( Up to the shoulder )
3. Rotate the nut with a wrench until the tube does not rotate freely
4. Mark position of the nut .
5. Rotate the nut 1-1/4 turns .
This method ensures that even if the tube O.D. is at the minimum
tolerance , the ferrules will be in contact with the tube for the
full 1-1/4 rotation.
In order to assure maximum fitting reliability and performance ,
great care should be given when selecting the tubing for each
Four variables must be considered when ordering tube for use with
2. Tube wall thickness
3. Tube surface finish
4. Tube hardness
Tubing should comply with standard ASTM A213 or ASTM A269 , be
seamless , and fully annealed .
The tube must be red of scratches and suitable for bending and
Why choose us
1: Various style for each products and completely series pneumatic
2: Large stock for fast shipping .
3: Customize according to your special request .
4: Provide free products information .
5: High quality with competitive price .
Q: How much is our minimum order quantity ?
A: Our minimun quantity is 1 Piece .
Q: Can the product be made with our logo and brand ?
A: Yes , of course , we can make . we are OEM supplier for years
and professional to make . But you need give us the authorization
Q: What ' s your delivery date ?
A: It depends on the number of orders . Delivery date is 7 - 30
days .if small order,pls buy from our aliexpress shop, If you need
emergency products , we can speed up the production of the first
Q: What is the price of the product ?
A: Our prices are based on the size and type of material , if you
can give me the information ,
then we can give you an estimated price is for reference only . We
can do any size and any desgin .
Q: what types of products you can make ?
A: We can make many kinds of stainless steel materials and
brass,aluminum . Valve / solenoid valve / electric valve /
pneumatic valve and air cylinder products and so on .
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