Lap Joint Flanges
Certified steel products, dependable supply and application-focused support for industrial buyers.
Lap joint flanges are paired with stub ends and are preferred where frequent dismantling and easy bolt alignment are required. Their rotating design helps installers align bolt holes quickly, especially in lined piping, stainless systems and equipment connections. Kwality Steel (India) offers these flanges in multiple grades with matching stub ends when required.
Size Range1/2 inch to 24 inch
Wall / Pressure ClassClass 150 to
600
TypesFlat Face, Raised Face, Stub End
Assembly
StandardsASME B16.5, MSS SP-43
FinishMachined, Polished,
Coated
LengthAs per stub end
Materials Grades
Available in corrosion-resistant, high-temperature and pressure-grade materials for industrial service. Grade selection can be aligned with pressure, temperature, corrosion allowance and client specification.
Stainless Steel 304/304LStainless Steel 316/316LCarbon SteelAlloy
SteelDuplex 2205Super Duplex 2507InconelMonelHastelloyTitanium
Dimensions Chart
Common ASME B16.5 Class 150 lap joint flange dimensions. Used with short or long pattern stub ends.
Lap Joint Flanges Dimensions Chart
Includes key flange drilling dimensions and stub-end usage note.
| NPS | DN | OD A (mm) | PCD (mm) | Bolt Holes | Thickness T (mm) | Bore / Note |
|---|---|---|---|---|---|---|
| 1/2 | 15 | 89 | 60.3 | 4 x 15.9 | 11.2 | Use with stub end |
| 3/4 | 20 | 98 | 69.9 | 4 x 15.9 | 12.7 | Use with stub end |
| 1 | 25 | 108 | 79.4 | 4 x 15.9 | 14.2 | Use with stub end |
| 1-1/2 | 40 | 127 | 98.4 | 4 x 15.9 | 17.5 | Use with stub end |
| 2 | 50 | 152 | 120.7 | 4 x 19.1 | 19.1 | Use with stub end |
| 3 | 80 | 190 | 152.4 | 4 x 19.1 | 23.9 | Use with stub end |
| 4 | 100 | 229 | 190.5 | 8 x 19.1 | 23.9 | Use with stub end |
| 6 | 150 | 279 | 241.3 | 8 x 22.2 | 25.4 | Use with stub end |
| 8 | 200 | 343 | 298.5 | 8 x 22.2 | 28.4 | Use with stub end |
| 10 | 250 | 406 | 362.0 | 12 x 25.4 | 30.2 | Use with stub end |
| 12 | 300 | 483 | 431.8 | 12 x 25.4 | 31.8 | Use with stub end |
Applications
Oil & Gas
Reliable performance for demanding fabrication, maintenance and process piping needs.
Petrochemical
Reliable performance for demanding fabrication, maintenance and process piping needs.
Power & Energy
Reliable performance for demanding fabrication, maintenance and process piping needs.
Marine
Reliable performance for demanding fabrication, maintenance and process piping needs.
Chemical
Reliable performance for demanding fabrication, maintenance and process piping needs.
Construction
Reliable performance for demanding fabrication, maintenance and process piping needs.
