LEKE PIPING / PRODUCTS
Lap joint flanges pair with matching stub ends. Specify both components and whether the stub end is included.
PRODUCT DETAILS
We can also make custom sizes, thicknesses and other dimensions to your drawing. Send your specifications with your RFQ so we can confirm the details.
| Parameter | Details to confirm |
|---|---|
| Assembly | Backing flange and matching stub end |
| Compatibility | Provide flange bore and corner radius, stub end type, lap dimensions and matching pipe wall |
| Materials | Specify the material standard, grade and certificate requirements for each component |
| Standard | Identify the flange and stub end standards, editions and assembly drawing revision |
Product dimensions, material grades and documentation are confirmed against your enquiry and applicable project requirements.
Primary dimensional reference: ASME B16.5 (NPS 1/2–24 where the type is covered); specify the matching stub end. Confirm the product type, edition and applicable size before order.
DIMENSIONAL REFERENCE
Use the section view to identify the dimensions to confirm in your enquiry.
Symbols describe this supplied drawing. Confirm their correspondence with the selected standard and dimension table; notation may differ.
Review the backing flange and stub end as an assembly. Confirm lap geometry, gasket-contact surface and mating connection against the approved drawing; do not apply a generic facing-height value to the assembly.
SELECTION & ENQUIRY
State whether you need the backing flange, the stub end or both. List the quantity of each component separately.
Provide the stub end drawing, including lap diameter, thickness, radius and length. Check compatibility with the backing flange and connected pipe before ordering.
List both material grades and required inspection records. Any difference in materials must meet the approved project specification and service requirements.
TECHNICAL REFERENCES
ASME B16.5 / B16.47
Check that the reference covers the required lap joint flange and matching stub end. A large-diameter flange reference alone does not establish assembly compatibility; use the specified standards and approved drawing.
Select size, pressure class and material to estimate backing flange weight and explore the 3D model. Stub end, gasket and bolting are excluded.
PRODUCT VIEWS
Compare the product views. Use the dimensional drawings and confirmed specifications for your order.
DIMENSIONAL REFERENCES
Reference data retained from the existing product page. Check the stated standard, edition, units and the approved project specification.
Response within 24 hours
| Nominal Pipe Size | Outside Diam.D | Diam. at Base of Hub X | O.D. of Raised Face G | Thickness t | Lap Joint B3 | Lap Joint T3 | Diam. of Hub at Bevel A | Radius of Fillet R |
|---|---|---|---|---|---|---|---|---|
| 1/2 | 89 | 30.2 | 35.1 | 11.2 | 22.9 | 15.7 | 21.3 | 3.0 |
| 3/4 | 99 | 38.1 | 42.9 | 12.7 | 28.2 | 15.7 | 26.7 | 3.0 |
| 1 | 108 | 49.3 | 50.8 | 14.2 | 35.1 | 17.5 | 33.5 | 3.0 |
| 1 1/4 | 117 | 58.7 | 63.5 | 15.7 | 43.7 | 20.6 | 42.2 | 4.8 |
| 1 1/2 | 127 | 65.0 | 73.2 | 17.5 | 50.0 | 22.4 | 48.3 | 6.4 |
| 2 | 152 | 77.7 | 91.9 | 19.1 | 62.5 | 25.4 | 60.5 | 7.9 |
| 2 1/2 | 178 | 90.4 | 104.6 | 22.4 | 75.4 | 28.4 | 73.2 | 7.9 |
| 3 | 191 | 108.0 | 127.0 | 23.9 | 91.4 | 30.2 | 88.9 | 9.7 |
| 3 1/2 | 216 | 122.2 | 139.7 | 23.9 | 104.1 | 31.8 | 101.6 | 9.7 |
| 4 | 229 | 134.9 | 157.2 | 23.9 | 116.8 | 33.3 | 114.3 | 11.2 |
| 5 | 254 | 163.6 | 185.7 | 23.9 | 144.5 | 36.6 | 141.2 | 11.2 |
| 6 | 279 | 192.0 | 215.9 | 25.4 | 171.5 | 39.6 | 168.4 | 12.7 |
| 8 | 343 | 246.1 | 269.7 | 28.4 | 222.3 | 44.5 | 219.2 | 12.7 |
| 10 | 406 | 304.8 | 323.9 | 30.2 | 277.4 | 49.3 | 273.1 | 12.7 |
| 12 | 483 | 365.3 | 381.0 | 31.8 | 328.2 | 55.6 | 323.9 | 12.7 |
| 14 | 533 | 400.1 | 412.8 | 35.1 | 360.2 | 79.2 | 355.6 | 12.7 |
| 16 | 597 | 457.2 | 469.9 | 36.6 | 411.2 | 87.4 | 406.4 | 12.7 |
| 18 | 635 | 505.0 | 533.4 | 39.6 | 462.3 | 96.8 | 457.2 | 12.7 |
| 20 | 699 | 558.8 | 584.2 | 42.9 | 514.4 | 103.1 | 508.0 | 12.7 |
| 24 | 813 | 663.4 | 692.2 | 47.8 | 616.0 | 111.3 | 609.6 | 12.7 |
| ASME B16.5 Welding Neck Flanges | ASME B16.47 Series B Welding Neck Flanges | ASME B16.47 Series A Welding Neck Flanges |
| Class 150 | Class 75 | |
| Class 300 | Class 150 | Class 150 |
| Class 600 | Class 300 | Class 300 |
| Class 900 | Class 400 | Class 400 |
| Class 1500 | Class 600 | Class 600 |
| Class 2500 | Class 900 | Class 900 |
COMMON QUESTIONS
Specify whether you need the backing flange only or the complete flange-and-stub-end assembly.
List the required number of loose flanges and stub ends separately, or explicitly define the contents of each set. Use matching item references to avoid an incomplete assembly.
Provide the stub-end drawing and check the neck, lap and contact dimensions against the loose flange. Confirm that the two components are intended to work together.
Specify the material for each part separately. Material selection must follow the project design, including which component contacts the process fluid.
Send both component drawings, quantities and the mating connection requirements. Do not select a loose flange solely from its outside diameter or photograph.
Slip-On FlangesReview the bore, facing and connection details.
View product details →
Weld Neck FlangesReview the hub, bore and welding-end requirements.
View product details →
Plate FlangesReview the plate dimensions, bore and facing requirements.
View product details →
Blind FlangesReview closure dimensions, facing and bolt pattern.
View product details →
Socket Weld FlangesReview the socket, bore and connection dimensions.
View product details →
Threaded FlangesReview the required thread and facing details.
View product details →Send flange size, class and standard, plus stub end type and dimensions. List each component’s material grade and quantity, drawing revision and required certificates.
SEND YOUR REQUIREMENT
Email your item list with quantities, destination and required delivery date. Flag any open points.
The quotation will confirm supply scope, required documents and delivery terms.
