ASME B16.48 Spectacle Flange/Spectacle Blind/Paddle Flange/Spades Spacers Dimensions

ASME B16.48 Spectacle Flanges Dimensions

A spectacle blind is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service. It is different than a valve in that the blind is a permanent or long term isolation device. A spectacle blind is machined from a single piece of metal that is cut to match the pipe size, fit between two pipe flanges and requires an additional gasket when it is installed. Also, the bolts will need to be lengthened depending on what piping class and size blind is used. The thickness of the spectacle blind is specified based on the line pressure and pipe size.

ASME B16.48 Spectacle Flange Class 150 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	45	16	60	3	35.1	1.6	38	2	15.7	0.12
3/4″	54	21	70	3	42.9	1.6	38	2	15.7	0.17
1″	64	27	80	3	50.8	1.6	38	2	15.7	0.23
1-1/4″	73	42	90	6.4	63.5	1.6	38	4	15.7	0.49
1-1/2″	83	48	100	6.4	73.2	1.6	38	4	15.7	0.63
2″	102	61	120	6.4	91.9	1.6	51	4	19.1	0.96
2-1/2″	107	73	140	6.4	104.6	1.6	51	4	19.1	1.07
3″	133	89	150	6.4	127	1.6	64	4	19.1	1.59
3-1/2″	159	102	175	9.7	139.7	1.6	64	6	19.1	3
4″	172	114	190	9.7	157.2	1.6	64	6	19.1	3.52
5″	194	141	215	9.7	185.7	1.6	76	6	22.4	4.34
6″	219	168	240	12.7	215.9	1.6	76	8	22.4	6.66
8″	276	219	300	12.7	269.7	1.6	76	8	22.4	10.19
10″	337	273	360	15.7	323.9	1.6	102	10	25.4	17.59
12″	406	324	430	19.1	381	1.6	102	13	25.4	30.31
14″	448	356	475	19.1	412.8	1.6	108	13	28.4	36.8
16″	511	406	540	22.4	469.9	1.6	108	15	28.4	55.11
18″	546	457	580	25.4	533.4	1.6	114	17	31.8	68.18
20″	603	508	635	28.4	584.2	1.6	121	19	31.8	90.98
24″	714	610	750	31.8	692.2	1.6	140	21	35.1	139.19

ASME B16.48 Spectacle Flange Class 300 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	51	16	65	6.4	35.1	1.6	38	4	15.7	0.25
3/4″	64	21	80	6.4	42.9	1.6	38	4	19.1	0.38
1″	70	27	90	6.4	50.8	1.6	38	4	19.1	0.46
1-1/4″	79	42	100	6.4	63.5	1.6	38	4	19.1	0.56
1-1/2″	92	48	115	6.4	73.2	1.6	38	4	22.4	0.76
2″	108	61	125	9.7	91.9	1.6	51	6	19.1	1.46
2-1/2″	127	73	150	9.7	104.6	1.6	51	6	22.4	1.98
3″	146	89	170	9.7	127	1.6	64	6	22.4	2.61
3-1/2″	162	102	185	12.7	139.7	1.6	64	8	22.4	3.93
4″	178	114	200	12.7	157.2	1.6	64	8	22.4	4.73
5″	213	141	235	15.7	185.7	1.6	76	10	22.4	7.93
6″	248	168	270	15.7	215.9	1.6	76	10	22.4	10.56
8″	305	219	330	22.4	269.7	1.6	76	15	25.4	21.16
10″	359	273	385	25.4	323.9	1.6	102	17	28.4	31.63
12″	419	324	450	28.4	381	1.6	102	19	31.8	47.11
14″	483	356	515	31.8	412.8	1.6	108	21	31.8	71.3
16″	536	406	570	38.1	469.9	1.6	108	25	35.1	102.25
18″	594	457	630	41.1	533.4	1.6	114	27	35.1	133.67
20″	651	508	685	44.5	584.2	1.6	121	30	35.1	170.85
24″	772	610	810	50.8	692.2	1.6	140	34	41.1	269.41

ASME B16.48 Spectacle Flange Class 600 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	51	16	65	6.4	35.1	6.35	38	4	15.7	0.38
3/4″	64	21	80	6.4	42.9	6.35	38	4	19.1	0.57
1″	70	27	90	6.4	50.8	6.35	57	4	19.1	0.73
1-1/4″	79	37	100	9.7	63.5	6.35	57	6	19.1	1.24
1-1/2″	92	43	115	9.7	73.2	6.35	67	6	22.4	1.65
2″	108	55	125	9.7	91.9	6.35	57	6	19.1	2.33
2-1/2″	127	67	150	12.7	104.6	6.35	67	8	22.4	3.61
3″	146	83	170	12.7	127	6.35	67	8	22.4	4.87
3-1/2″	159	96	185	15.7	139.7	6.35	76	10	25.4	6.46
4″	191	108	215	15.7	157.2	6.35	76	10	25.4	9
5″	238	135	265	19.1	185.7	6.35	86	13	28.4	15.34
6″	264	162	290	22.4	215.9	6.35	86	15	28.4	21.06
8″	318	212	350	28.4	269.7	6.35	95	19	31.8	35.75
10″	397	265	430	35.1	323.9	6.35	105	23	35.1	64.41
12″	454	315	490	41.1	381	6.35	105	27	35.1	94.88
14″	489	346	525	44.5	412.8	6.35	114	30	38.1	116.37
16″	562	397	605	50.8	469.9	6.35	124	34	41.1	171.78
18″	610	448	655	53.8	533.4	6.35	133	36	44.5	210.36
20″	679	497	725	63.5	584.2	6.35	133	42	44.5	299.91
24″	787	597	840	73.2	692.2	6.35	152	49	50.8	447.64

ASME B16.48 Spectacle Flange Class 600 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	60	16	80	6.4	34.9	6.35	38	4	23	0.46
3/4″	67	21	90	6.4	42.9	6.35	41	4	23	0.61
1″	76	27	100	6.4	50.8	6.35	57	4	26	0.8
1-1/4″	86	37	110	9.7	63.5	6.35	57	6	26	1.37
1-1/2″	95	43	125	9.7	73	6.35	67	6	29	1.73
2″	140	55	165	12.7	92.1	6.35	57	8	26	3.98
2-1/2″	162	67	190	12.7	104.8	6.35	67	8	29	5.21
3″	165	83	190	15.7	127	6.35	67	10	26	6.68
4″	203	108	235	19.1	157.2	6.35	76	13	32	11.45
5″	244	135	280	22.4	185.7	6.35	86	15	35	18.15
6″	286	162	320	25.4	215.9	6.35	86	17	32	27.04
8″	356	212	395	35.1	269.9	6.35	95	23	39	53.48
10″	432	265	470	41.1	323.8	6.35	105	27	39	88.31
12″	495	315	535	47.8	381	6.35	105	32	39	130.89
14″	518	346	560	53.8	412.8	6.35	114	36	42	156.56
16″	572	397	615	60.5	469.9	6.35	124	40	45	208.72
18″	635	448	685	66.5	533.4	6.35	133	44	51	278.8
20″	696	497	750	73.2	584.2	6.35	133	49	54	361.74
24″	835	597	900	88.9	692.2	6.35	152	59	67	619.04

ASME B16.48 Spectacle Flange Class 1500 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	61	16	80	6.4	34.9	6.35	38	4	23	0.46
3/4″	67	21	90	9.7	42.9	6.35	41	6	23	0.79
1″	76	27	100	9.7	50.8	6.35	64	6	26	1.05
1-1/4″	86	35	110	9.7	63.5	6.35	64	6	26	1.4
1-1/2″	95	41	125	12.7	73	6.35	70	8	29	2.08
2″	140	53	165	12.7	92.1	6.35	70	8	26	4.04
2-1/2″	162	63	190	15.7	104.3	6.35	76	10	29	6.21
3″	172	78	205	19.1	127	6.35	76	13	32	8.47
4″	206	102	240	22.4	157.2	6.35	89	15	35	13.58
5″	251	128	290	28.4	185.7	6.35	89	19	42	23.62
6″	279	154	320	35.1	215.9	6.35	89	23	39	34.45
8″	349	203	395	41.1	269.9	6.35	102	27	45	60.13
10″	432	255	480	50.8	323.8	6.35	114	34	51	108.77
12″	518	303	570	60.5	381	6.35	114	40	54	182.62
14″	575	333	635	66.5	412.8	6.35	127	44	61	245.28
16″	638	381	705	76.2	469.9	6.35	133	51	67	339.62
18″	702	429	775	85.9	533.4	6.35	146	57	74	457.52
20″	752	478	830	95.3	584.2	6.35	152	64	80	569.25
24″	899	575	990	111.3	692.2	6.35	178	74	93	936.93

ASME B16.48 Spectacle Flange Class 2500 LBS Dimensions
NPS	O	B	A	t	G	RF	W	Wt	Dh	Weight
1/2″	67	16	90	9.7	34.9	6.35	38	6	23	0.72
3/4″	73	21	95	9.7	42.9	6.35	41	6	23	0.89
1″	83	27	110	9.7	50.8	6.35	64	6	26	1.19
1-1/4″	102	35	130	12.7	63.5	6.35	64	8	29	2.14
1-1/2″	114	41	145	15.7	73	6.35	70	10	32	3.17
2″	143	53	170	15.7	92.1	6.35	70	10	29	4.9
2-1/2″	165	63	195	19.1	104.8	6.35	76	13	32	7.5
3″	194	78	230	22.4	127	6.35	76	15	35	11.81
4″	232	102	275	28.4	157.2	6.35	89	19	42	20.45
5″	276	128	325	35.1	185.7	6.35	89	23	48	34.01
6″	314	154	370	41.1	215.9	6.35	89	27	54	49.98
8″	384	198	440	53.8	269.9	6.35	102	36	54	94.12
10″	473	248	540	66.5	323.8	6.35	114	44	67	171.27
12″	546	289	620	79.2	381	6.35	114	53	74	268.26

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