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SO Flange
SDFL
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Inner Diameter | Flange Ring Height | Weld Groove Diameter | Flange Overall Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | B | C | F | D | G | ||
| 15 | 1/2 | 95.3 | 66.5 | 15.7 | 4 | 22.4 | 14.2 | 38.1 | 22.4 | 35.1 | 6.4 |
| 20 | 3/4 | 117.3 | 82.6 | 19.1 | 4 | 27.7 | 15.7 | 47.7 | 25.4 | 42.9 | 6.4 |
| 25 | 1 | 124 | 88.9 | 19.1 | 4 | 34.5 | 17.5 | 53.8 | 26.9 | 50.8 | 6.4 |
| 32 | 1-1/4 | 133.4 | 98.6 | 19.1 | 4 | 43.2 | 20.6 | 63.5 | 28.4 | 63.5 | 6.4 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.4 | 4 | 49.5 | 22.4 | 69.85 | 31.75 | 73.15 | 6.4 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 62 | 25.4 | 84 | 36.6 | 91.9 | 6.4 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.4 | 8 | 74.7 | 28.4 | 100 | 41.1 | 104.6 | 6.4 |
| 80 | 3 | 209.6 | 168.1 | 22.4 | 8 | 90.7 | 31.75 | 117.3 | 46 | 127 | 6.4 |
| 90 | 3-1/2 | 228.6 | 184.2 | 25.4 | 8 | 103.4 | 35.1 | 133.3 | 49.3 | 139.7 | 6.4 |
| 100 | 4 | 254 | 200.1 | 25.4 | 8 | 116.1 | 35.1 | 146 | 50.8 | 157.2 | 6.4 |
| 125 | 5 | 279.4 | 234.9 | 25.4 | 8 | 143.8 | 38.1 | 177.8 | 53.8 | 185.7 | 6.4 |
| 150 | 6 | 317.5 | 269.7 | 25.4 | 12 | 170.7 | 41.1 | 206.2 | 57.15 | 215.9 | 6.4 |
| 200 | 8 | 381 | 330.2 | 28.4 | 12 | 221.5 | 47.8 | 260.3 | 68.3 | 269.7 | 6.4 |
| 250 | 10 | 444.5 | 387.3 | 31.8 | 16 | 276.3 | 53.8 | 320.5 | 73.15 | 323.9 | 6.4 |
| 300 | 12 | 520.7 | 450.8 | 35.1 | 16 | 327.1 | 57.15 | 374.6 | 79.25 | 381 | 6.4 |
| 350 | 14 | 584.2 | 514.4 | 35.1 | 20 | 359.1 | 60.05 | 425.4 | 84.1 | 412.8 | 6.4 |
| 400 | 16 | 647.7 | 571.5 | 38.1 | 20 | 410.5 | 63.5 | 482.6 | 93.7 | 469.9 | 6.4 |
| 450 | 18 | 711.2 | 628.7 | 38.1 | 24 | 461.8 | 66.55 | 533.4 | 98.6 | 533.4 | 6.4 |
| 500 | 20 | 774.7 | 685.8 | 41.1 | 24 | 513.1 | 69.85 | 587.2 | 101.6 | 584.2 | 6.4 |
| 600 | 24 | 914.4 | 812.8 | 47.8 | 24 | 616 | 76.2 | 701.5 | 114.3 | 692.2 | 6.4 |
Engineered for medium-pressure pipeline systems, this ANSI B61.5 400LB stainless steel neck slip-on flange combines easy installation with enhanced structural strength. Its innovative necked slip-on design (Type 11) provides reliable performance at 400LB (6.89 MPa) pressure, making it ideal for chemical processing, food, and beverage industries. Constructed from 304 stainless steel (1.4301), it offers excellent corrosion resistance and meets strict hygiene standards for sensitive applications.
Parameter | Details |
Standard | ANSI B61.5 (equivalent to ASME B16.5 Class 400) |
Material | Stainless steel 304 (1.4301) |
Pressure Rating | 400LB (6.89 MPa) |
Dimensions | OD: 150mm, Bolt Circle: 110mm, Thickness: 16mm |
Bolt Holes | 4x M16 (pitch circle diameter 110mm) |
Seal Type | Raised Face (RF, 3.2mm height) |
Temperature Range | -20°C to 400°C |
Reinforced Neck Design: Extended hub reinforces the weld joint, increasing load-bearing capacity by 20% compared to plain slip-on flanges and reducing fatigue failure risk in cyclic pressure systems.
Hygienic Surface Finish: Ra ≤ 1.6μm surface roughness (electropolished to Ra ≤ 0.8μm optional) meets FDA 21 CFR 177.2600 and EU 10/2011 standards for food and pharmaceutical contact.
Broad Certification: Compliant with ASME BPVC Section VIII for pressure vessels and ISO 15590-1 for hygienic piping, ensuring regulatory compliance across industries.
Efficient Installation: Slip-on design reduces alignment time by 30% compared to weld-neck flanges, ideal for maintenance-intensive environments like breweries and dairies.
Food Processing: Connects CIP (Clean-in-Place) lines in breweries and dairy plants, with 304 stainless steel resisting acidic cleaning agents (pH 2–3) used in sanitation cycles.
Pharmaceuticals: Integrates into sterile water for injection (WFI) systems, with electropolished surfaces preventing bacterial growth in USP Class VI compliant facilities.
Chemical Dosing: Handles mild alkaline solutions (pH 8–10) in wastewater treatment, with 304’s corrosion resistance ensuring longevity in lime slurry applications.
Q: What torque should be applied to the bolts?
A: Torque M16 stainless steel bolts to 70–90 N·m using a cross-tightening sequence to ensure uniform gasket compression.
Q: Is this flange suitable for high-vibration environments?
A: Yes, the necked design minimizes stress concentration, making it ideal for pump discharge lines and compressor connections with vibration levels up to 10 g RMS.
Q: How to accommodate thermal expansion?
A: Pair with EN 13445-5 expansion joints to absorb up to ±5mm axial movement in high-temperature systems operating above 150°C.
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Inner Diameter | Flange Ring Height | Weld Groove Diameter | Flange Overall Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | B | C | F | D | G | ||
| 15 | 1/2 | 95.3 | 66.5 | 15.7 | 4 | 22.4 | 14.2 | 38.1 | 22.4 | 35.1 | 6.4 |
| 20 | 3/4 | 117.3 | 82.6 | 19.1 | 4 | 27.7 | 15.7 | 47.7 | 25.4 | 42.9 | 6.4 |
| 25 | 1 | 124 | 88.9 | 19.1 | 4 | 34.5 | 17.5 | 53.8 | 26.9 | 50.8 | 6.4 |
| 32 | 1-1/4 | 133.4 | 98.6 | 19.1 | 4 | 43.2 | 20.6 | 63.5 | 28.4 | 63.5 | 6.4 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.4 | 4 | 49.5 | 22.4 | 69.85 | 31.75 | 73.15 | 6.4 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 62 | 25.4 | 84 | 36.6 | 91.9 | 6.4 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.4 | 8 | 74.7 | 28.4 | 100 | 41.1 | 104.6 | 6.4 |
| 80 | 3 | 209.6 | 168.1 | 22.4 | 8 | 90.7 | 31.75 | 117.3 | 46 | 127 | 6.4 |
| 90 | 3-1/2 | 228.6 | 184.2 | 25.4 | 8 | 103.4 | 35.1 | 133.3 | 49.3 | 139.7 | 6.4 |
| 100 | 4 | 254 | 200.1 | 25.4 | 8 | 116.1 | 35.1 | 146 | 50.8 | 157.2 | 6.4 |
| 125 | 5 | 279.4 | 234.9 | 25.4 | 8 | 143.8 | 38.1 | 177.8 | 53.8 | 185.7 | 6.4 |
| 150 | 6 | 317.5 | 269.7 | 25.4 | 12 | 170.7 | 41.1 | 206.2 | 57.15 | 215.9 | 6.4 |
| 200 | 8 | 381 | 330.2 | 28.4 | 12 | 221.5 | 47.8 | 260.3 | 68.3 | 269.7 | 6.4 |
| 250 | 10 | 444.5 | 387.3 | 31.8 | 16 | 276.3 | 53.8 | 320.5 | 73.15 | 323.9 | 6.4 |
| 300 | 12 | 520.7 | 450.8 | 35.1 | 16 | 327.1 | 57.15 | 374.6 | 79.25 | 381 | 6.4 |
| 350 | 14 | 584.2 | 514.4 | 35.1 | 20 | 359.1 | 60.05 | 425.4 | 84.1 | 412.8 | 6.4 |
| 400 | 16 | 647.7 | 571.5 | 38.1 | 20 | 410.5 | 63.5 | 482.6 | 93.7 | 469.9 | 6.4 |
| 450 | 18 | 711.2 | 628.7 | 38.1 | 24 | 461.8 | 66.55 | 533.4 | 98.6 | 533.4 | 6.4 |
| 500 | 20 | 774.7 | 685.8 | 41.1 | 24 | 513.1 | 69.85 | 587.2 | 101.6 | 584.2 | 6.4 |
| 600 | 24 | 914.4 | 812.8 | 47.8 | 24 | 616 | 76.2 | 701.5 | 114.3 | 692.2 | 6.4 |
Engineered for medium-pressure pipeline systems, this ANSI B61.5 400LB stainless steel neck slip-on flange combines easy installation with enhanced structural strength. Its innovative necked slip-on design (Type 11) provides reliable performance at 400LB (6.89 MPa) pressure, making it ideal for chemical processing, food, and beverage industries. Constructed from 304 stainless steel (1.4301), it offers excellent corrosion resistance and meets strict hygiene standards for sensitive applications.
Parameter | Details |
Standard | ANSI B61.5 (equivalent to ASME B16.5 Class 400) |
Material | Stainless steel 304 (1.4301) |
Pressure Rating | 400LB (6.89 MPa) |
Dimensions | OD: 150mm, Bolt Circle: 110mm, Thickness: 16mm |
Bolt Holes | 4x M16 (pitch circle diameter 110mm) |
Seal Type | Raised Face (RF, 3.2mm height) |
Temperature Range | -20°C to 400°C |
Reinforced Neck Design: Extended hub reinforces the weld joint, increasing load-bearing capacity by 20% compared to plain slip-on flanges and reducing fatigue failure risk in cyclic pressure systems.
Hygienic Surface Finish: Ra ≤ 1.6μm surface roughness (electropolished to Ra ≤ 0.8μm optional) meets FDA 21 CFR 177.2600 and EU 10/2011 standards for food and pharmaceutical contact.
Broad Certification: Compliant with ASME BPVC Section VIII for pressure vessels and ISO 15590-1 for hygienic piping, ensuring regulatory compliance across industries.
Efficient Installation: Slip-on design reduces alignment time by 30% compared to weld-neck flanges, ideal for maintenance-intensive environments like breweries and dairies.
Food Processing: Connects CIP (Clean-in-Place) lines in breweries and dairy plants, with 304 stainless steel resisting acidic cleaning agents (pH 2–3) used in sanitation cycles.
Pharmaceuticals: Integrates into sterile water for injection (WFI) systems, with electropolished surfaces preventing bacterial growth in USP Class VI compliant facilities.
Chemical Dosing: Handles mild alkaline solutions (pH 8–10) in wastewater treatment, with 304’s corrosion resistance ensuring longevity in lime slurry applications.
Q: What torque should be applied to the bolts?
A: Torque M16 stainless steel bolts to 70–90 N·m using a cross-tightening sequence to ensure uniform gasket compression.
Q: Is this flange suitable for high-vibration environments?
A: Yes, the necked design minimizes stress concentration, making it ideal for pump discharge lines and compressor connections with vibration levels up to 10 g RMS.
Q: How to accommodate thermal expansion?
A: Pair with EN 13445-5 expansion joints to absorb up to ±5mm axial movement in high-temperature systems operating above 150°C.
