Direct Factory Lap Joint Flange with Type a Stub End Backing Flanges

• Customization: Available
• Standard: ANSI, DIN, JIS, En/BS
• Type: Welding Flange
• Model NO.: LAP JOINT FLANGE
• Material: Carbon Steel, Stainless Steel, Alloy Steel
• Structure: Flanges
• Connection: Welding
• Sealing Surface: FF RF FM,etc
• Manufacturing Way: Forging
• Price Term: EXW Factory,Fob,C&F,CIF
• Class Range: Class 150,Class 300,400,600,900,1500,2500
• Flange Standard: ASTM A182, ASTM A105, ASTM A234 Wpb, A860,A694,Aww
• Surface Treatment: Stainless Steel:Pickling and Passivation Polishing
• Transport Package: Wooden Box or Pallet or Carton
• Specification: 1/2''-60''NPS (DN15-DN3000), ect
• Trademark: HD-STEEL
• Origin: Cangzhou, Hebei, China
• HS Code: 73072900
• Production Capacity: 500000PCS/Year
• Package Size: 30.00cm * 30.00cm * 20.00cm
• Package Gross Weight: 5.000kg
• Lead Time: 10 days (1 - 100 Pieces) ; To be negotiated ( > 100 Pieces)

Product Description

Direct Factory Lap Joint Flange with Type A Stub End Backing Flanges 

LAP JOINT Flange Overview: 

Lap joint flanges, also known as backup flanges or loose ring flanges, are used in piping systems that require frequent disassembly or alignment flexibility. They consist of two components: a stub end welded to the pipe and a loose backing flange that slips over the stub and bolts to a mating flange. This design allows the backing flange to rotate, which makes it easier to align bolt holes during installation. Lap joint flanges do not seal by themselves; they rely on a gasket, which creates a secure seal between two surfaces.

These flanges work perfectly for low to moderate-pressure applications.They are commonly used where access is limited or regular maintenance is needed. They can accommodate different types of pipe and flange materials, which makes them suitable for systems carrying corrosive or high-temperature fluids. 

Common Applications:
Removable Connections:Used in systems that require frequent disassembly, such as for maintenance, inspection, or cleaning.

Low-Pressure Systems:Ideal for pipelines operating under moderate pressure, where heavy-duty sealing isn't required.

Corrosive Environments:Paired with corrosion-resistant stub ends to handle aggressive liquids while keeping material costs low.

Temporary Piping:Well-suited for installations that need to be assembled and dismantled quickly, like test setups or pilot systems.

Marine and Offshore Use:Widely used on ships and offshore structures due to easy bolt alignment and corrosion resistance.

Variable Process Industries:Used in oil, gas, chemical, and water systems that may need quick adjustments, expansions, or reconfiguration.

Specification

Feature	Details
Standard	ASME B16.5 , ASME B16.47, DIN, EN 1092-1.BS 4504,etc
Sizes	1/2'' to 24''
Material Type	Carbon Steel Blind Flange (ASTM A105);Stainless steel (F304, F316L); Alloy steels ASTM A182 (F5,F9,F11, F22).
Temperature Range	Carbon Steel (A105): -29°C to 425°C ;Stainless Steel (304/316): -196°C to 870°C;
Thickness	SCH 10, SCH 40, SCH 160
Pressure Classes	Ranging from Class 150 to 2500 (Class 300, 400, 600, 900, 1500, 2500).
Facing Options	Flat Face (FF): Used for low-pressure/brittle connections. Raised Face (RF): Most common; concentrates gasket pressure. Ring Type Joint (RTJ): Features a groove for high-pressure/temp seals.
Application	Industrial Applications:Water treatment systems;HVAC and ventilation lines;Low-pressure steam piping;Fire protection networks;Irrigation pipelines;Food processing plants;Marine piping systems;Chemical transfer lines
Test	Chemical Component Analysis, Mechanical Properties, Technical Properties, Exterior Size Inspection, hydraulic testing , X-ray Test.
Manufacturing Process	Generally has four types: Forging, Casting and forging, Medium plate cutting, Casting
Package	Wooden box or Pallet or carton

Packaging & Shipping

Company Profile

HD STEEL GROUP

We HD-STEEL-GROUP, consisit from Hebei Province Dianli Pipe Fitting Co., Ltd and Cangzhou Hongding Pipe Industry Co., Ltd(Hereafter abbreviated as HD-STEEL) is located along the famous "Elbow Capital"-Yanshan industrial zone, Cangzhou City, Hebei Province since 1997!

 

HD-STEEL is a professional manufacturer in Carbon steel/Alloy steel/ Stainless steel Pipe fittings & Flanges & ANTI-CORROSION STEEL PIPE in China. Our registered fund is 16.7 million, With strong economic strength & advanced production equipment. Certificated by CE, ISO, CCS, AMSE, etc.

 

Products could customized by ASME(ANSI),  EN,  DIN, JIS, GOST, GB/T, ISO and so on. We continuing commitment to the production of quality products has made us internationally recognized in the following industries: power generation, petroleum, natural gas, chemical, shipbuilding, heating, papermaking, metallurgy, among others.

 

We group specializes in the production of  pipe fittings, flanges and anti corrosion line pipes, steel inventory, domestic and foreign sales. We are committed to providing one-stop service for steel pipe products to customers around the world. And has leading technology of steel pipe fittings and flanges production and research  at home and abroad, advanced and complete testing facilities .We strictly in accordance with the International standard quality management system for on-site management,  our products have been inspected and approved by SGS, BV, MOODY, TUBOSCOPE and other international authoritative third-party organizations

 

Our company adheres to the principles of "customer first", "quality first" and "credibility first" and is willing to establish a long-term cooperative relationship with you with our strong economic strength, advanced management experience and high-quality service for mutual benefit and common success.

 

We are fully confident that we will bring you higher economic benefits with excellent quality and reasonable prices. Choosing us means you have chosen a sincere friend and reliable partner. HD GROUP sincerely welcomes your visit.

FAQ

Frequently Asked Questions

Q:Can I Get A Sample For Testing?
A:Yes, We Can Provide Samples.
Q:Is It Safe On The Payment For Me As We Are The First Cooperation?
A:We Can Do The Trade Assurance On Made-In-China, Which Will Guarantee Your Payment Safety, We Also Accept Other Safe Payment Way As You Want.
Q:Do You Accept Product Customization?
A:Yes, We Can Accept Material Customization, Specification Model Customization, Drawing Customization, Packaging Customization.
Q:Can I Put Our Logo On The Product?
A:Yes, We Can Provide You With Laser Engraving Logo And Sticker Logo For Free.
Q:What Is The MOQ?
A:For Trial Order, We Can Sell Even One Piece
Q:How Long Is The Product Warranty Period?
A:One Year, If The Product Is Non-Artificially Damaged During The Warranty Period, We Can Provide You With A New Product For Free.
Q:How Long Is The Delivery Time?
A:If We Have Stock, We Will Ship Within 5 Days, If There Is No Stock, We Will Ship Within 7-30 Days.
Q:Do You Accept OEM/ODM Service?
A:Yes, We Can Produce Products According To Your Requirements.