Lap Joint Flange

Item No.: FL1006
Dimension: NPS 1/2"~24" (15NB-600NB)
Material: Carbon Steel, Stainless Steel, Duplex Steel, Alloy Steel etc.
Flange face type: RF (Raised Face), RTJ (Ring Type Joint)
Certificates: CE-PED 2014/68/EU / ISO 9001 / MTC EN10204 3.1/3.2
Supply Ability: 100 Tons per Month
Non-Standard type: As per the drawing
Payment Term: L/C, T/T
Packing: Export standard Plywood Pallets/ free fumigation wooden case
Place of Origin: Shanghai, China

 ASME B16.5 Lapped Flange     Lap Joint Flange     Loose Plate Flange     EN 1092-1 Type 02 Loose plate flange with weld ring neck   
EN 1092-1 Type 04 Loose plate flange with weld-neck collar    Gost 12822-80 Loose Flange with Welded Ring


Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End".

A Stub End always will be used with a Lap Joint flange, as a backing flange in ASME B16.5 NORM. 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.

In EN1092-1 Series, there are 6 different collars connecting with the loose plate flange:

Type 32 b Weld-on plate collar 
Type 33 a, b Lapped pipe end 
Type 34 b Weld-neck collar 

Type 35 b Weldring neck 
Type 36 b Pressed collar with long neck 
Type 37 b Pressed collar
a This is an integral part of a pressure equipment or a component.
b Type numbers 32, 33, 35, 36 and 37 are for use with type 02 flanges and type number 34 for use with type 04 flanges. 

Lap Joint Flange Specification


NPS 1/2"~24" (15NB-600NB)


ASME/ANSI Series: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500
EN Series: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400
BS Series: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40
DIN Series: PN 6, PN 10, PN 16, PN 25, PN 40
GOST Series: PN 6, PN 10, PN 16, PN 25, PN 40

Flange Face Type

ASME/ANSI Series: Flat Face(FF), Raised Face(RF), Tongue(T), Groove(G), Female(F), Male(M), Ring type Joint Face(RTJ)
GOST Series: Type 1, 2, 3, 4, 5, 6, 7, 8, 9
EN Series: Type A(Flat Face), Type B(Raised Face), Type C(Tongue), Type D(Groove), Type E(Spigot), Type F(Recess), Type G(O-Ring Spigot), Type H (O-Ring Groove)


ASME B16.5 Flanges
EN 1092-1 Flanges
GB/T 9112-2010, GB/T 9115-2010, GB/T 13402-2010
HG/T 20592-2009, HG/T 20615-2009, HG/T 20623-2009
ISO 7005-1 Flanges

Coating/Surface Treatment

Anti-rust oil, Transparent / Black Anti-rust Painting, Hot Dip Galvanized

Value-Added Services

CNC Machining, Customised Flanges

Lap Joint Flange  Flange Material Type & Grade

Stainless Steel Lap Joint Flange Flanges: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Carbon Steel Lap Joint Flange Flanges: ASTM / ASME A/SA 105, ASTM / ASME A 350, ASTM A 181 LF 2 / A516 Gr.70, A36, A694 F42, F46, F52, F60, F65, F70
Alloy Steel Lap Joint Flange Flanges: ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Duplex & Super Duplex Steel Lap Joint Flange Flanges: ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Low Temperature Carbon Steel Lap Joint Flange Flanges: ASTM A350, LF2, LF3
Copper Alloy Steel Lap Joint Flange Flanges: UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
Nickel Alloy Long Lap Joint Flange Flanges: Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium Gr I/II



Available Certificates
Manufacturer Test Certificate as per EN 10204 3.1, Third-Party Inspection Report as per EN 10204 3.2, Non-destructive Testing / NDT Report 

1. Oil and gas industry
2. Petrochemical industry
3. Power generation industry
4. Pharmaceutical industry
5. Shipbuilding industry
6. Papermaking industry
7. Metallurgy industry


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