OEM Industrial So Flange Quotes – Forged Lap Joint Loose Flange – C. Z. IT

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OEM Industrial So Flange Quotes – Forged Lap Joint Loose Flange – C. Z. IT Detail:


Product Name Lap joint/Loose flange
Size 1/2″-24″
Pressure 150#-2500#,PN0.6-PN400,5K-40K
Standard ANSI B16.5,EN1092-1, JIS B2220 etc.
Stub end MSS SP 43, ASME B16.9
Material Stainless steel: A182F304/304L, A182 F316/316L, A182F321, A182F310S, A182F347H, A182F316Ti, 317/317L, 904L, 1.4301, 1.4307, 1.4401, 1.4571,1.4541, 254Mo and etc.
Carbon steel: A105, A350LF2, S235Jr, S275Jr, St37, St45.8, A42CP, A48CP, E24 , A515 Gr60, A515 Gr 70 etc.
Duplex stainless steel: UNS31803, SAF2205, UNS32205, UNS31500, UNS32750 , UNS32760, 1.4462,1.4410,1.4501 and etc.
Pipeline steel: A694 F42, A694F52, A694 F60, A694 F65, A694 F70, A694 F80 etc.
Nickel alloy: inconel600, inconel625, inconel690, incoloy800, incoloy 825, incoloy 800H,C22, C-276, Monel400, Alloy20 etc.
Cr-Mo alloy: A182F11, A182F5, A182F22, A182F91, A182F9, 16mo3,15Crmo, etc.
Application Petrochemical industry;aviation and aerospace industry;pharmaceutical industry;gas exhaust;power plant;ship building;water treatment,etc.
Advantages ready stock,faster delivery time;available in all sizes,customized;high quality



A lap-joint flange requires two piping components for each side of the flanged connection, a stub end and a loose backing flange. The loose backing flange fits over the outside diameter of the stub end, which is butt-welded to the pipe. The backing flange is not welded to the pipe, and it can be rotated, which is particularly useful when it is necessary to orientate flanges during erection.

Also, as the backing flange does not come in contact with the process fluid, it can made of a less corrosive-resistant material. For example, if the process is corrosive and requires the pipe to be of stainless steel, as in ASTM A312 TP316L, then the stub end must also be made of SS 316L; however, the backing flange can be made of the cheaper ASTM A105.

This method of jointing is not as robust as a weld neck flange but is superior to screwed, socket weld, and slip on connections; however, it is more expensive to execute, because it require a full-penetration butt weld and requires two components.

Lap joint Flange




A Stub End always will be used with a Lap Joint flange, as a backing flange.

This flange connections are applied, in low-pressure and non critical applications, and is a cheap method of flanging.
In a stainless steel pipe system, for example, a carbon steel flange can be applied, because they are not come in contact with the product in the pipe.

Stub Ends are available in almost all pipe diameters. Dimensions and dimensional tolerances are defined in the ASME B.16.9 standard. Light-weight corrosion resistant Stub Ends (fittings) are defined in MSS SP43.

Stub  End





  • Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
  • Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
  • In systems which erode or corrode quickly, the flanges may be salvaged for re-use.



1. Face

flat face, Radius is the most important

2. With hub or without hub

3.Face finish

The finish on the face of flange is measured as an Arithmetical Average Roughness Height(AARH). The finish is determined by the standard used. For example, ANSI B16.5 specifies face finishes within a range 125AARH-500AARH(3.2Ra to 12.5Ra). Other finishes are available on requst, for example 1.6 Ra max,1.6/3.2 Ra, 3.2/6.3Ra or 6.3/12.5Ra. The range 3.2/6.3Ra is most common.


• Each layer use plastic film to protect the surface

• For all stainless steel are packed by plywood case. For bigger size carbon flange are packed by plywood pallet. Or can be customized packing.

• Shipping mark can make on request

• Markings on products can be carved or printed. OEM is accepted.


• UT test

• PT test

• MT test

• Dimension test

Before delivery, our QC team will arrange NDT test and dimension inspection.Also accept TPI(third party inspection).


1. Choose Genuine raw material 2. Cut raw material 3. Pre-heating
4. Forging 5. Heat treatment 6. Rough Machining
7. Drilling 8. Fine maching 9. Marking
10. Inspection 11. Packing 12. Delivery

Product detail pictures:

OEM Industrial So Flange Quotes –  Forged Lap Joint Loose Flange – C. Z. IT detail pictures

OEM Industrial So Flange Quotes –  Forged Lap Joint Loose Flange – C. Z. IT detail pictures

OEM Industrial So Flange Quotes –  Forged Lap Joint Loose Flange – C. Z. IT detail pictures

Related Product Guide:
What are duplex stainless steel applications?

Our focus on should be to consolidate and enhance the quality and repair of present products, in the meantime constantly establish new products to meet unique customers' requires for OEM Industrial So Flange Quotes – Forged Lap Joint Loose Flange – C. Z. IT, The product will supply to all over the world, such as: Argentina, Israel, Benin, Our company is continuing to serve customers with high quality, competitive price and timely delivery. We sincerely welcome friends from all over the world to cooperate with us and enlarge our business. If you are interested in our products, please feel free to contact us. We would love to provide you with further information.
  • The factory can meet continuously developing economic and market needs, so that their products are widely recognized and trusted, and that's why we chose this company.
    5 Stars By Jessie from Italy - 2017.11.12 12:31
    The goods are very perfect and the company sales manager is warmful, we will come to this company to purchase next time.
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