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Lap Joint Flange
JS FITTINGS provides high-performance Lap Joint Flanges (LJF) designed for piping systems requiring frequent dismantling and limited space. Our lap joint flanges are manufactured to the highest industry standards, ensuring a perfect fit with Stub Ends for cost-effective and easy-to-align piping solutions. Whether you are a global stockist or an industrial contractor, we offer bulk supply with mill-direct pricing and certified quality.
Product Features:
Standards: ASME B16.5, ASME B16.47 Series A & B, DIN, JIS B2220, EN1092-1
Size Range: 1/2″ (DN15) – 48″ (DN1200) or customed
Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500; PN6 to PN100
Face Types: Flat Face (FF), Raised Face (RF)
Product
INFORMATION
A lap joint flange (LJ flange) consists of two parts: a stub end and a lap joint ring flange. To be technically correct, the stub end is not part of a lap joint flange. A stub end always uses a lap joint flange. They often call it a “lap joint flange.” Because of their design, lap joint flanges always have a flat smooth surface. But when you combine it with the stub end, the sealing face rises. This occurs because the sealing face of the stub end is above the flange’s bolting plane. The forged steel lap joint flange has no sealing face; only the stub end has the sealing face. To meet diverse industrial requirements, our flanges are available in a wide range of sizes and pressure ratings: Carbon Steel: ASTM A105, A350 LF2, A694 F42-F70 Alloy Steel: ASTM A182 F5, F9, F11, F22 At JS FITTINGS, quality is not a slogan—it’s our standard. Every lap joint flange undergoes rigorous testing before shipment: Our Lap Joint flanges are trusted in critical environments worldwide, including: Material Standards and Dimensions Lap joint flange dimensions are defined by ANSI/ASME B16.5 for sizes NPS ½″ to 24″ and pressure classes from 150 to 2500. For larger pipe sizes, NPS 26″ to 60″, dimensions follow ASME B16.47 standards. They are commonly manufactured from materials such as A105 forged carbon steel, A182, 304/316 forged stainless steel, and alloy steel to suit a wide range of service conditions. Click here to get more standard dimensions. Lap Joint Flanges Process: Order Information for Stockists & Distributors How does it compare with other flange types? We’ll compare the most commonly used flanges used in the industry with lap joint flanges. It will guide you in selecting the best flange for different conditions and scenarios. Weld neck flanges are welded to the pipe with the long tapered hub. They are good for applications under high-pressure conditions, but they are expensive. Also, since they are welded, their maintenance is costly and time-consuming. On the other hand, lap joint flanges can be installed and maintained easily due to their rotating design. It makes them perfect for systems requiring regular maintenance and adjustments. Slip-on flanges, as the name suggests, slide over the pipe. Then, they are welded on both sides to provide strength. They are not costly, but their strength under fatigue conditions is low. Lap joints flange provide easy alignment compared to slip on flanges. Its because the flange itself doesn’t require to be aligned properly before welding. Socket weld flanges are usually used in pipes with small diameters. The pipe is inserted into the flange, and then it is welded. While lap joint flanges don’t require any welding. It eliminates the risk of weld fatigue and makes assembly and disassembly faster. Threaded flanges do not require any welding. They are screwed directly into the threaded pipes. This makes them suitable to be used in explosive environments. However, they are not suitable for high-pressure environments. Lap joint flanges can be installed in piping systems with varying pressure and temperature. You can simply change the stub end and gasket based on the conditions. It gives you more flexibility and ensures easier alignment. While all these flange types have their own pros and cons, it is suggested to use multiple flange types aligned with lap joint flanges. It gives you more flexibility and ensures safety under different conditions. As a leading manufacturer of carbon steel pipe fittings and flanges across China, JS FITTINGS has more than 40 years of experience serving industries of all sizes. Our expert sales analysts are available today to help you choose the ideal lap joint flanges or rolled angle rings for your needs. Contact us today to learn more about our selection of high-quality steel flanges. WhatsApp: +8618003119682What is a Lap Joint flange?
Technical Specifications
Feature Specification Details Standards ASME B16.5, ASME B16.47 Series A & B, DIN, JIS B2220, EN1092-1 Size Range 1/2″ (DN15) – 48″ (DN1200) Pressure Ratings Class 150, 300, 600, 900, 1500, 2500; PN6 to PN100 Face Types Flat Face (FF), Raised Face (RF) Materials Stainless Steel: ASTM A182 F304/304L, F316/316L, F321, F347 Lap Joint Flange Types
Quality Assurance & Certification
Applications
Nominal Pipe Size Range Outside Diameter (A) Flange Thickness (C) Bolt Hole Diameter (H) 1/2″ – 1 1/2″ 3.5″ – 5″ 0.44″ – 0.69″ 0.62″ – 0.88″ 2″ – 4″ 6″ – 9″ 0.75″ – 1″ 0.75″ 5″ – 6″ 10″ – 11″ 1.06″ – 1.12″ 0.88″ 8″ – 10″ 13.5″ – 16″ 1.31″ – 1.56″ 0.88″ – 1″ 12″ – 16″ 19″ – 23.5″ 1.75″ – 2″ 1″ – 1.12″ 18″ – 24″ 25″ – 32″ 2.06″ – 2.38″ 1.25″ – 1.38″ 
Weld neck flange VS. Lap joint flanges
Slip-on flanges VS. Lap joint flanges
Socket weld flanges VS. Lap joint flanges
Threaded flanges VS. Lap joint flanges
Email: admin@jsfittings.com
SOME OF OUR
Testimonials
“This product is exactly in line with our requirement technically and competitive commercially.”
Anton
Russia
“The flanges are exactly in line with our requirement technically and competitive commercially.”
Boran
Turkey
“We tested the elbows and flanges, their performance is very nice. We will make the new purchase plan for the warehouse.”
Farir
Oman
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