The lap joint flange derived it name lap joint as it is to be joint with a joint stub end. The flange has curved radius at its bore to accommodate a lap joint stub. A lap joint flange is similar in some ways as slip-on flange as a stub end is slipped on the flange having slightly larger radius then the stub end joint. lap joint stub and flange are joint together to make a assembly. Thus lap joint flange allows easy dismantling of system assembly. We manufacture lap joint flange in different sizes and standards.
| DIMENSIONS TOLERANCES OF FLANGES (in mm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Welding neck | Threaded, Slip on lap joint, Socket welding and blind |
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| * | outside diameter | O.D. 600 if smaller | + 1.6
_ |
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| O.D. over 600 | + 3.1
_ |
* | outside diameter | O.D. 600 or smaller | + 1.6
_ |
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| O.D. over 600 | + 3.1
_ |
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| 250 and smaller | + 0.7
_ |
inside diameter | threaded : to stand gauge limit | ||||||
| inside diameter | 12 though 450 | + 1.6
_ |
(bore) | slop on .lap joint : socket-welding | |||||
| (bore) | 500 and larger | + 3.1 |
- 1.6 |
250 and smaller | + 0.7 |
- 0.0 |
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| 300 and larger | + 1.6 |
- 0.0 |
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| 1.6 raised face | + 0.4
_ |
threaded | |||||||
| diameter of | 6.3 raised face tounge & | diameter of | 250 and smaller | + 0.7 |
- 0.0 |
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| contact face | groove male and female | + 0.4
_ |
counter bore | 300 and larger | + 1.6 |
- 0.0 |
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| * | outside diameter | 300 and smaller | + 2.3 |
- 1.6 |
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| * | diameter of hub | 125 and smaller | + 2.2 |
- 0.7 |
of hub | 350 and larger | + 3.1
_ |
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| at point of weding | 150 and larger | + 4.0 |
- 0.7 |
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| diameter of | 1.6 raised face | + 0.7
_ |
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| contact face | 6.3 raised fact tongue & grooved | ||||||||
| Thickness | 450 and smaller | + 3.1 |
- 0.0 |
male & female | + 0.4
_ |
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| 500 and larger | + 4.7 |
- 0.0 |
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| Thickness | 450 and smaller | + 3.1 |
- 0.0 |
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| length through | 250 and smaller | + 1.6
_ |
hub | 500 and larger | + 4.7 |
- 0.0 |
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| hub | 300 and larger | + 3.1
_ |
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| * | length through | 450 and smaller | + 3.0 |
- 1.6 |
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| hub | 500 and larger | + 4.8 |
- 1.6 |
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| bolt circle | 600 and smaller | + 0.7
_ |
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| 600 and larger | + 1.6
_ |
bolt circle | + 1.6
_ |
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| drilling | bolt hole spacing | + 0.7
_ |
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| drilling | bolt hole spacing | + 0.7
_ |
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| eccenticity with respect | eccenticity with respect | ||||||||
| to bore | 0.70 max | to bore | 0.70 max | ||||||
