JIS B2220 Flange STEP Library

SOW — Slip-On Welding

Class	Size	Pipe OD	D	BCD (C)	Hole ∅	Bolts	Thread	t (mm)	RF ∅ (g)	RF h	STEP
10K	25A	34	125	90	19	4	M16	14	67	1.5	↓ STEP
10K	32A	42.7	135	100	19	4	M16	16	76	1.5	↓ STEP
10K	40A	48.6	140	105	19	4	M16	16	81	1.5	↓ STEP
10K	50A	60.5	155	120	19	4	M16	16	96	1.5	↓ STEP
10K	65A	76.3	175	140	19	4	M16	18	116	1.5	↓ STEP
10K	80A	89.1	185	150	19	8	M16	18	126	1.5	↓ STEP
10K	100A	114.3	210	175	19	8	M16	18	151	1.5	↓ STEP
10K	125A	139.8	250	210	23	8	M20	20	182	1.5	↓ STEP
10K	150A	165.2	280	240	23	8	M20	22	212	1.5	↓ STEP
16K	25A	34	125	90	19	4	M16	14	67	2	↓ STEP
16K	32A	42.7	135	100	19	4	M16	16	76	2	↓ STEP
16K	40A	48.6	140	105	19	4	M16	16	81	2	↓ STEP
16K	50A	60.5	155	120	19	8	M16	16	96	2	↓ STEP
16K	65A	76.3	175	140	19	8	M16	18	116	2	↓ STEP
16K	80A	89.1	200	160	23	8	M20	20	132	2	↓ STEP
16K	100A	114.3	225	185	23	8	M20	22	160	2	↓ STEP
16K	125A	139.8	270	225	25	8	M22	22	195	2	↓ STEP
16K	150A	165.2	305	260	25	12	M22	24	230	2	↓ STEP
16K	200A	216.3	350	305	25	12	M22	26	275	2	↓ STEP
20K	25A	34	125	90	19	4	M16	16	67	2	↓ STEP
20K	32A	42.7	135	100	19	4	M16	18	76	2	↓ STEP
20K	40A	48.6	140	105	19	4	M16	18	81	2	↓ STEP
20K	50A	60.5	155	120	19	8	M16	18	96	2	↓ STEP
20K	65A	76.3	175	140	19	8	M16	20	116	2	↓ STEP
20K	80A	89.1	200	160	23	8	M20	22	132	2	↓ STEP
20K	100A	114.3	225	185	23	8	M20	24	160	2	↓ STEP
20K	125A	139.8	270	225	25	8	M22	26	195	2	↓ STEP
20K	150A	165.2	305	260	25	12	M22	28	230	2	↓ STEP
20K	200A	216.3	350	305	25	12	M22	30	275	2	↓ STEP

BL — Blind

Class	Size	Pipe OD	D	BCD (C)	Hole ∅	Bolts	Thread	t (mm)	RF ∅ (g)	RF h	STEP
10K	25A	34	125	90	19	4	M16	18	67	1.5	↓ STEP
10K	32A	42.7	135	100	19	4	M16	19	76	1.5	↓ STEP
10K	40A	48.6	140	105	19	4	M16	21	81	1.5	↓ STEP
10K	50A	60.5	155	120	19	4	M16	21	96	1.5	↓ STEP
10K	65A	76.3	175	140	19	4	M16	23	116	1.5	↓ STEP
10K	80A	89.1	185	150	19	8	M16	24	126	1.5	↓ STEP
10K	100A	114.3	210	175	19	8	M16	29	151	1.5	↓ STEP
10K	125A	139.8	250	210	23	8	M20	29	182	1.5	↓ STEP
10K	150A	165.2	280	240	23	8	M20	33	212	1.5	↓ STEP
10K	200A	216.3	330	290	23	12	M20	34	262	1.5	↓ STEP
16K	25A	34	125	90	19	4	M16	20	67	2	↓ STEP
16K	32A	42.7	135	100	19	4	M16	22	76	2	↓ STEP
16K	40A	48.6	140	105	19	4	M16	24	81	2	↓ STEP
16K	50A	60.5	155	120	19	8	M16	24	96	2	↓ STEP
16K	65A	76.3	175	140	19	8	M16	26	116	2	↓ STEP
16K	80A	89.1	200	160	23	8	M20	28	132	2	↓ STEP
16K	100A	114.3	225	185	23	8	M20	34	160	2	↓ STEP
16K	125A	139.8	270	225	25	8	M22	34	195	2	↓ STEP
16K	150A	165.2	305	260	25	12	M22	38	230	2	↓ STEP
16K	200A	216.3	350	305	25	12	M22	40	275	2	↓ STEP
20K	25A	34	125	90	19	4	M16	24	67	2	↓ STEP
20K	32A	42.7	135	100	19	4	M16	26	76	2	↓ STEP
20K	40A	48.6	140	105	19	4	M16	26	81	2	↓ STEP
20K	50A	60.5	155	120	19	8	M16	26	96	2	↓ STEP
20K	65A	76.3	175	140	19	8	M16	30	116	2	↓ STEP
20K	80A	89.1	200	160	23	8	M20	34	132	2	↓ STEP
20K	100A	114.3	225	185	23	8	M20	36	160	2	↓ STEP
20K	125A	139.8	270	225	25	8	M22	40	195	2	↓ STEP
20K	150A	165.2	305	260	25	12	M22	42	230	2	↓ STEP
20K	200A	216.3	350	305	25	12	M22	46	275	2	↓ STEP

Notes

D, C, g, n, bd: Sourced from Diamond Flanges JIS B2220 standard tables and Axces engineering catalogue, cross-validated against Sunhyings reference data. Should match JIS B2220:2012 precisely.
JIS pipe OD: JIS G3454/G3456 pipe ODs differ from EN/ISO in several sizes (e.g. 150A = 165.2 mm, 200A = 216.3 mm). Bore clearance = +1.5 mm over JIS pipe OD.
Raised face: RF height: 1.5 mm for 10K (per JIS B2202), 2.0 mm for 16K and 20K. RF outer diameter g from JIS B2220 standard table column 'g'.
SOW thickness t: From JIS B2220 standard tables — high confidence for all classes and sizes.
SOW hub geometry (a, b, L): Hub base OD and total length from Haihao Piping (10K SOH) and Weldflange (16K, 20K SOH). See scripts/JIS_B2220_DATA_SOURCES.md for full source list. Hub modelled as straight cylinder at base OD (b); the true tapered hub (b→a over L−t) differs by 3–7 mm radial — negligible for fit-check models.
10K 200A SOW: not generated. Per JIS B2220, 10K 200A is offered as SOP (plate, no hub), not SOH. No authoritative hub data exists; we skip rather than fabricate.
BL thickness T (10K): T not tabulated in JIS B2220 for 10K below 250A. Values estimated from pattern at ~85% of 16K T. Suitable for fit checks only.
10K bolt pattern at 50A and 65A: 10K uses only 4 bolt holes at 50A and 65A; 16K and 20K use 8. This is per the JIS standard — 10K 50A/65A bolt patterns are lighter duty.
Weld neck (WN) not included: SOW and BL only. WN flanges require hub height data (h1) not reliably available from current sources; can be added in a future revision.
Not for pressure calculations: All models are dimensionally representative for fit and assembly. Not certified drawings — verify independently before use in pressure-retaining applications.

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SOW — Slip-On Welding

BL — Blind

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