RUT Union Tee Stainless Steel SS316L Plumbing Fitting Pneumatic Air
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
Two different methods can be used to cut tubes :
1 . Tube Cuter
2 . Hacksaw
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
Some Recautions to be taken
1.Tubes must not be dragged on the floor .
2.Tubes must not be dragged out of a tubing rack , especially in
case of large OD tubes
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
Use : This is a “ No- Go ” Gauge and should be used as follows :
Make up to fitting according to the following instructions : 1/4
inch ( 6mm ) , 3/8 inch , 1/2 inch ( 12mm ) – make up 1-1/4 turns
from finger tight . Check gap between nut and body , using the
appropriate sized gauge . If the gauge slides easily into the gap ,
tighten the nut further until gauge can not enter the gap
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: Reliable quality assured and active after-sell service
2: One year quality guarantee
3: Various style for each products and completely series pneumatic
4: High quality with competitive price .
5: Sample order & small quantity order is acceptable .
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 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 .
Q: Do your company have specialized technical personnel ?
A: Design as your requirements,and have QC for make 100% inspection
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: How much is our minimum order quantity ?
A: Our minimun quantity is 1 Piece .
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