ASME B16.36 Technical Specifications
Class 300 Threaded Orifice Flanges — ASME B16.36 Dimensions & Weights
Complete technical dimensions and specifications for Class 300 Threaded Orifice Flanges manufactured in accordance with ASME B16.36. Ideal for non-welded piping systems, supplied complete with jack-screws, hex nuts, and radial taps.
ASME B16.36 Class 300 Threaded Orifice Flange Technical Drawing (ASME B16.36 Standard Assembly)
Explore ASME B16.36 Orifice Flange Classes & Types
Threaded Orifice Class 300 Flanges — Dimensions Chart (Inches)
| NPS | Flange OD (O) | Thickness (C) | RF Diam (R) | Hub Base (X) | Hub Bevel (A) | LTH (Y) | Tap Conn (TT) | Bolt Circle | Hole Dia | # Bolts | Bolt Dia |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1" | 4.88" | 1.50" | 2.00" | 2.12" | 1.32" | 2.44" | 1/4" NPT | 3.50" | 0.69" | 4 | 5/8" |
| 1-1/2" | 6.12" | 1.50" | 2.88" | 2.75" | 1.90" | 2.69" | 1/4" NPT | 4.50" | 0.81" | 4 | 3/4" |
| 2" | 6.50" | 1.50" | 3.62" | 3.31" | 2.38" | 2.75" | 1/4" NPT | 5.00" | 0.69" | 8 | 5/8" |
| 2-1/2" | 7.50" | 1.50" | 4.12" | 3.94" | 2.88" | 3.00" | 1/4" NPT | 5.88" | 0.81" | 8 | 3/4" |
| 3" | 8.25" | 1.50" | 5.00" | 4.62" | 3.50" | 3.12" | 3/8" NPT | 6.62" | 0.81" | 8 | 3/4" |
| 4" | 10.00" | 1.50" | 6.19" | 5.75" | 4.50" | 3.38" | 1/2" NPT | 7.88" | 0.81" | 8 | 3/4" |
| 6" | 12.50" | 1.50" | 8.50" | 8.12" | 6.63" | 3.88" | 1/2" NPT | 10.62" | 0.88" | 12 | 3/4" |
| 8" | 15.00" | 1.62" | 10.62" | 10.25" | 8.63" | 4.25" | 1/2" NPT | 13.00" | 1.00" | 12 | 7/8" |
| 10" | 17.50" | 1.88" | 12.75" | 12.62" | 10.75" | 4.62" | 1/2" NPT | 15.25" | 1.12" | 16 | 1" |
| 12" | 20.50" | 2.00" | 15.00" | 14.75" | 12.75" | 5.12" | 1/2" NPT | 17.75" | 1.25" | 16 | 1-1/8" |
| 14" | 23.00" | 2.12" | 16.25" | 16.75" | 14.00" | 5.62" | 1/2" NPT | 20.25" | 1.25" | 20 | 1-1/8" |
| 16" | 25.50" | 2.25" | 18.50" | 19.00" | 16.00" | 5.75" | 1/2" NPT | 22.50" | 1.38" | 20 | 1-1/4" |
| 18" | 28.00" | 2.38" | 21.00" | 21.00" | 18.00" | 6.25" | 1/2" NPT | 24.75" | 1.38" | 24 | 1-1/4" |
| 20" | 30.50" | 2.50" | 23.00" | 23.12" | 20.00" | 6.38" | 1/2" NPT | 27.00" | 1.38" | 24 | 1-1/4" |
| 22" | 33.00" | 2.62" | 25.25" | 25.25" | 22.00" | 6.50" | 1/2" NPT | 29.25" | 1.50" | 24 | 1-3/8" |
| 24" | 36.00" | 2.75" | 27.25" | 27.62" | 24.00" | 6.62" | 1/2" NPT | 32.00" | 1.62" | 24 | 1-1/2" |
📋 ASME B16.36 Orifice Flange Standard Notes
- Pressure Connections: Each orifice flange is supplied with two radial tapped pressure tap connections (standard 1/2" NPT, or 1/4" NPT / 3/8" NPT where specified) located 180 degrees apart.
- Jack-Screws: Supplied as an Orifice Union pair complete with precision jack-screws and hex nuts for spreading flanges during orifice plate installation or maintenance.
- Raised Face: Standard Class 300 and Class 400 feature a 1/16" (1.6 mm) raised face; Class 600, 900, 1500, and 2500 feature a standard 0.25" (6.4 mm) raised face or Ring Type Joint (RTJ).
- Bore Schedule: Bore diameter (B) for weld neck and slip on flanges must be specified by the purchaser to correspond with the piping schedule or wall thickness.
- Class 300 / 600 Equivalency: In accordance with ASME B16.36, Weld Neck Orifice Flanges in NPS 3" and smaller for Class 300 are identical in dimensions to Class 600 and may be dual-marked.
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