JIS B2220 · SS400 / S25C · stock and made to order
40A 16K Weld Neck (WN) Flange — JIS B2220
40A 16K weld neck flange to JIS B2220, machined from SS400 / S25C. Outside diameter 140 mm, thickness 16 mm, 4 bolt holes on a 105 mm circle. Available with raised face, flat face or the facing specified on your drawing.
Size
40A / DN40
Standard
JIS B2220 (JIS B2220:2012)
Pressure rating
16K
Outside diameter
140 mm
Thickness
16 mm
Bolt circle
105 mm
Full dimensions — 40A 16K
| Size | DN | OD | Thickness | RF Ø | Bolt circle | Bolts | Length | |
|---|---|---|---|---|---|---|---|---|
| 10A | 10 | 90 mm | 12 mm | 46 mm | 65 mm | 4 × Ø15 mm | 31 mm | Details → |
| 15A | 15 | 95 mm | 12 mm | 51 mm | 70 mm | 4 × Ø15 mm | 32 mm | Details → |
| 20A | 20 | 100 mm | 14 mm | 56 mm | 75 mm | 4 × Ø15 mm | 34 mm | Details → |
| 25A | 25 | 125 mm | 14 mm | 67 mm | 90 mm | 4 × Ø19 mm | 36 mm | Details → |
| 32A | 32 | 135 mm | 16 mm | 76 mm | 100 mm | 4 × Ø19 mm | 39 mm | Details → |
| 40A (this size) | 40 | 140 mm | 16 mm | 81 mm | 105 mm | 4 × Ø19 mm | 39 mm | Details → |
| 50A | 50 | 155 mm | 16 mm | 96 mm | 120 mm | 8 × Ø19 mm | 40 mm | Details → |
| 65A | 65 | 175 mm | 18 mm | 116 mm | 140 mm | 8 × Ø19 mm | 46 mm | Details → |
| 80A | 80 | 200 mm | 20 mm | 132 mm | 160 mm | 8 × Ø23 mm | 49 mm | Details → |
| 90A | 90 | 210 mm | 20 mm | 145 mm | 170 mm | 8 × Ø23 mm | 50 mm | Details → |
| 100A | 100 | 225 mm | 22 mm | 160 mm | 185 mm | 8 × Ø23 mm | 56 mm | Details → |
| 125A | 125 | 270 mm | 22 mm | 195 mm | 225 mm | 8 × Ø25 mm | 60 mm | Details → |
| 150A | 150 | 305 mm | 24 mm | 230 mm | 260 mm | 12 × Ø25 mm | 69 mm | Details → |
| 200A | 200 | 350 mm | 26 mm | 275 mm | 305 mm | 12 × Ø27 mm | 73 mm | Details → |
| 250A | 250 | 430 mm | 28 mm | 345 mm | 380 mm | 12 × Ø27 mm | 81 mm | Details → |
| 300A | 300 | 480 mm | 30 mm | 395 mm | 430 mm | 16 × Ø33 mm | 88 mm | Details → |
| 350A | 350 | 540 mm | 34 mm | 440 mm | 480 mm | 16 × Ø33 mm | 104 mm | Details → |
| 400A | 400 | 605 mm | 38 mm | 495 mm | 540 mm | 16 × Ø33 mm | 115 mm | Details → |
| 450A | 450 | 675 mm | 40 mm | 560 mm | 605 mm | 20 × Ø33 mm | 126 mm | Details → |
| 500A | 500 | 730 mm | 42 mm | 615 mm | 660 mm | 20 × Ø33 mm | 128 mm | Details → |
| 550A | 550 | 795 mm | 44 mm | 670 mm | 720 mm | 20 × Ø39 mm | 135 mm | Details → |
| 600A | 600 | 845 mm | 46 mm | 720 mm | 770 mm | 24 × Ø39 mm | 141 mm | Details → |
Published JIS B2220 dimensions for every 16K size in this product family.
Dimensions in millimetres. Bolt hole diameter applies to through-holes. For stud length, gasket and bolting selection, match the gasket and bolts to JIS B2220.
What 16K means in service
JIS 16K is a nominal rating of approximately 1.6 MPa (16 kgf/cm²). The JIS B2220 Table 11 maximum working pressure for material group 1.1, Division I is higher than the nominal figure at up to 120 °C, then derates with temperature; read the table for your material group and division.
JIS K ratings are kgf/cm² nominal: 5K ≈ 0.5 MPa, 10K ≈ 1.0 MPa, 16K ≈ 1.6 MPa, 20K ≈ 2.0 MPa and 30K ≈ 3.0 MPa. The published maximum working pressure is higher or lower than the nominal figure depending on material group and division — for material group 1.1, Division I, the JIS B2220 Table 11 value at up to 120 °C is 0.7 MPa for 5K, 1.4 MPa for 10K, 2.7 MPa for 16K, 3.4 MPa for 20K, 5.1 MPa for 30K, 6.8 MPa for 40K and 10.7 MPa for 63K. Allowable pressure falls with temperature, and JIS bolt patterns differ from ASME classes of similar pressure.
Facing and materials
Raised face (RF) is standard for steel JIS flanges; the raised-face height is 2 mm. Flat face is available on request.
- SS400
- S25C
- SUS304
- SUS316
- SCS13 / SCS14 (cast)
Other grades, impact-tested heats and NACE MR0175 requirements are quoted on request. Material certificates to EN 10204 3.1 are issued against the same heat number as the dimensional report.
Inspection and delivery
- Dimensional inspection against the JIS B2220 table for 40A 16K
- Heat number stamped on the rim; EN 10204 3.1 certificate issued
- PMI on stainless and alloy heats; UT/RT on request
- Anti-rust oil, plywood case or pallet, with packing list and MTC
- Typical lead time 7–15 days for carbon steel stock sizes, 20–30 days for alloys
Other sizes in 16K
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40A 16K Weld Neck (WN) Flange
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