Lap Joint Flanges

Lap Joint Flanges Manufacturers

Rishabh Steel Industries is one of eminent manufacturers and suppliers of high grade Lap Joint Flanges. Rishabh Steel Industries overseas offers a commendable range of Lap Joint Flanges, for the prestigious client with competitive price. Export packaging is grade towards the protection, handling and transport of Lap Joint Flanges by air or sea freight, as such shares many characteristics with export and transport Lap Joint Flanges packing. Backed by a diligent teen of professional, we are engaged in offering an excellent quality range of Lap Joint Flanges.

Lap Joint Flanges Specification

Type Lap Joint Flanges
Standards ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Outside Diameter ≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter ≤ 10 = ± 0.8 mm
> 12 = + 1.6 mm / - 0 mm
Diameter Contact Face 1.6 mm RF = ±0.8 mm
6.35 mm RF = ±0.4 mm
Tongue & Groove = ±0.4 mm
Male-Female = ±0.4 mm
Outside Diameter of Hub ≤12 = + 2.4 mm/ - 1.6 mm
≥ 14 = ± 3.2 mm
Diameter of Counterbore Same as for Inside Diameter
Drilling Bolt Circle = 1.6 mm
Bolt Hole Spacing = ±0.8 mm

Eccentricity Bolt Circle with Respect to Facing
≤2.1/2 = 0.8 mm max
≥3 = 1.6 mm max
Thickness ≤18 = +3.2 mm / -0
≥20 = +4.8 mm / -0
Length thru Hub ≤18 = 3.2 mm / - 0.8 mm
≥20 = + 4.8 mm / - 1.6 mm
Pressure Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.
Order Accept custom order
Quality Assurance

All fittings and flanges are subject to strict inspection at each stage of the production process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality conformity of products.

Marking & Packing

Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All buttweld fittings are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.#Protected by End Caps.

Value Added Services
  • Hot Dipped Galvanizing
  • CNC Machining
  • Customised Flanges
Test Certificates Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report

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". These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End. Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.

They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).

Lap Joint flanges have certain special advantages:

  • 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.

Carbon Steel Lap Joint Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8
Stainless Steel Lap Joint Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L
Alloy Steel Lap Joint Flanges: ASTM A182 F1, F5, F9, F11, F22, F91
Special Alloy Lap Joint Flanges: Duplex, Super Duplex, Nickel Alloys
Flange Face Type: Weld neck Flate Face (WNFF), Weld neck Raised Face (WNRF), Weld neck Ring Type Joint (WNRTJ)
Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized