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Dimensions of Non-Metallic Flat Gaskets for ASME/ANSI B16.5 & B16.47 Pipe Flanges

NPS 1/2 - 24

NPS 26 - 60 (Series A)

NPS 26 - 60 (Series B)

NPS 1/2 - 24

NPS	ID	OD	Hole Qty	Hole Size	BCD
0.5	0.84	3.75	4	0.63	2.62
0.75	1.06	4.62	4	0.75	3.25
1	1.31	4.88	4	0.75	3.5
1.25	1.66	5.25	4	0.75	3.88
1.5	1.91	6.12	4	0.88	4.5
2	2.38	6.5	8	0.75	5
2.5	2.88	7.5	8	0.88	5.88
3	3.5	8.25	8	0.88	6.62
3.5	4	9	8	0.88	7.25
4	4.5	10	8	0.88	7.88
5	5.56	11	8	0.88	9.25
6	6.63	12.5	12	0.88	10.62
8	8.63	15	12	1	13
10	10.75	17.5	16	1.12	15.25
12	12.75	20.5	16	1.25	17.75
14	14	23	20	1.25	20.25
16	16	25.5	20	1.38	22.5
18	18	28	24	1.38	24.75
20	20	30.5	24	1.38	27
22¹	22	33	24	1.63	29.25
24	24	36	24	1.63	32

NPS 26 - 60 (Series A)

NPS	ID	OD	Hole Qty	Hole Size	BCD
26	26	38.25	28	1.75	34.5
28	28	40.75	28	1.75	37
30	30	43	28	1.88	39.25
32	32	45.25	28	2	41.5
34	34	47.5	28	2	43.5
36	36	50	32	2.12	46
38	38	46	32	1.63	43
40	40	48.75	32	1.75	45.5
42	42	50.75	32	1.75	47.5
44	44	53.25	32	1.88	49.75
46	46	55.75	28	2	52
48	48	57.75	32	2	54
50	50	60.25	32	2.12	56.25
52	52	62.25	32	2.12	58.25
54	54	65.25	28	2.38	61
56	56	67.25	28	2.38	63
58	58	69.25	32	2.38	65
60	60	71.25	32	2.38	67

NPS 26 - 60 (Series B)

NPS	ID	OD	Hole Qty	Hole Size	BCD
26	26	34.12	32	1.38	31.62
28	28	36.25	36	1.38	33.75
30	30	39	36	1.5	36.25
32	32	41.5	32	1.63	38.5
34	34	43.63	36	1.63	40.62
36	36	46.12	32	1.75	42.88
38	38	48.12	36	1.75	44.88
40	40	50.12	40	1.75	46.88
42	42	52.5	36	1.88	49
44	44	54.5	40	1.88	51
46	46	57.5	36	2	53.75
48	48	59.5	40	2	55.75
50	50	61.5	44	2	57.75
52	52	63.5	48	2	59.75
54	54	65.88	48	2	62.12
56	56	69.5	36	2.38	65
58	58	71.94	40	2.38	67.44
60	60	73.94	40	2.38	69.44

NPS = Nominal Pipe Size
ID = Inner Diameter
OD = Outer Diameter
BCD = Bolt Circle Diameter

General Note:
All dimensions are in inches.
Larger sizes as well as customized sizes can be furnished.
Bolt diameter should be 1/8″ less than the bolt hole size.

¹ For Reference Only:
Size NPS 22 not listed in ASME B16.21

Standards:
ASME B16.21 – Non-metallic flat gaskets for pipe flanges
ASME B16.5 – Pipe flanges and flanged fittings: NPS 1/2 through 24
ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard

No liability or guarantee for the correctness and completeness of the information provided

NSP 1/2 - 24

NSP 26 - 60 (Series A)

NSP 26 - 60 (Series B)