Dimensions of Spades and Ring Spacers ASME B16.48 suitable for ASME B16.5 RF flanges

Pressure Class 150

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	45	16	126	3	32
3/4	54	21	131	3	32
1	64	27	136	3	32
1.1/4	73	42	145	6.4	32
1.1/2	83	48	145	6.4	32
2	102	61	155	6.4	32
2.1/2	107	73	170	6.4	32
3	133	89	170	6.4	32
3.1/2	159	102	202	9.7	38
4	172	114	202	9.7	38
5	194	141	225	9.7	38
6	219	168	225	12.7	38
8	276	219	267	12.7	38
10	337	273	322	15.7	44
12	406	324	357	19.1	44
14	448	356	378	19.1	44
16	511	406	410	22.4	44
18	546	457	427	25.4	51
20	603	508	455	28.4	51
24	714	610	512	31.8	51

Pressure Class 300

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	51	16	129	6.4	32
3/4	64	21	136	6.4	32
1	70	27	139	6.4	32
1.1/4	79	42	150	6.4	32
1.1/2	92	48	150	6.4	32
2	108	61	158	9.7	32
2.1/2	127	73	177	9.7	32
3	146	89	177	9.7	32
3.1/2	162	102	205	12.7	38
4	178	114	205	12.7	38
5	213	141	240	15.7	38
6	248	168	240	15.7	38
8	305	219	281	22.4	38
10	359	273	333	25.4	44
12	419	324	363	28.4	44
14	483	356	395	31.8	44
16	536	406	422	38.1	44
18	594	457	450	41.1	51
20	651	508	480	44.5	51
24	772	610	540	50.8	51

Details Spectacle blinds Spades and Ring spacers

Pressure Class 600

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	51	16	129	6.4	32
3/4	64	21	136	6.4	32
1	70	27	139	6.4	32
1.1/4	79	37	150	9.7	32
1.1/2	92	43	150	9.7	32
2	108	55	158	9.7	32
2.1/2	127	67	177	12.7	32
3	146	83	177	12.7	32
3.1/2	159	96	211	15.7	38
4	191	108	211	15.7	38
5	238	135	248	19.1	38
6	264	162	248	22.4	38
8	318	212	288	28.4	38
10	397	265	352	35.1	44
12	454	315	381	41.1	44
14	489	346	398	44.5	44
16	562	397	435	50.8	44
18	610	448	459	53.8	51
20	679	497	493	63.5	51
24	787	597	547	73.2	51

Pressure Class 900

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	60	16	134	6.4	32
3/4	67	21	137	6.4	32
1	76	27	142	6.4	32
1.1/4	86	37	151	9.7	32
1.1/2	95	43	151	9.7	32
2	140	55	174	12.7	32
2.1/2	162	67	186	12.7	32
3	165	83	186	15.7	32
4	203	108	217	19.1	38
5	244	135	259	22.4	38
6	286	162	259	25.4	38
8	356	212	307	35.1	38
10	432	265	370	41.1	44
12	495	315	401	47.8	44
14	518	346	412	53.8	44
16	572	397	440	60.5	44
18	635	448	471	66.5	51
20	696	497	501	73.2	51
24	835	597	571	88.9	51

Pressure Class 1500

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	61	16	135	6.4	32
3/4	67	21	137	9.7	32
1	76	27	142	9.7	32
1.1/4	86	35	151	9.7	32
1.1/2	95	41	151	12.7	32
2	140	53	174	12.7	32
2.1/2	162	63	190	15.7	32
3	172	78	190	19.1	32
4	206	102	219	22.4	38
5	251	128	256	28.4	38
6	279	154	256	35.1	38
8	349	203	303	41.1	38
10	432	255	370	50.8	44
12	518	303	412	60.5	44
14	575	333	442	66.5	44
16	638	381	472	76.2	44
18	702	429	504	85.9	51
20	752	478	530	95.3	51
24	899	575	603	111.3	51

Pressure Class 2500

NPS	Outside Dia A	Inside Dia B	Center End C	Thick ness t	Handle Width W
1/2	67	16	137	9.7	32
3/4	73	21	140	9.7	32
1	83	27	145	9.7	32
1.1/4	102	35	161	12.7	32
1.1/2	114	41	161	15.7	32
2	143	53	175	15.7	32
2.1/2	165	63	201	19.1	32
3	194	78	201	22.4	32
4	232	102	232	28.4	38
5	276	128	273	35.1	38
6	314	154	273	41.1	38
8	384	198	321	53.8	38
10	473	248	390	66.5	44
12	546	289	427	79.2	44

General notes..

Dimensions are in millimeters unless otherwise indicated.
Spade Handles shall be solid with NO openings.

Further notes..

Ring Spacer Handles shall have a single through indicator hole located near the end of the handle. The hole diameter shall not be less than 12 mm.
Wt = Thickness of the handle should be 6 mm minimum, or equal to Thickness (t) if less than 6 mm.
Spades and Ring Spacers should be made from a plate or forging specification, approved for use by ASME B31.3, of essentially the same chemical composition as the mating flanges and piping involved.
Spades and Ring Spacers ASME B16.48 may be used for installation between ASME B16.5 flanges
Depending on a customer specification, some dimensions can be different from what on this page is defined.

Additional note..

Spectacle blinds with a diameter greater than 24 inches are not covered by ASME B16.48. Currently (January 2026), there are no reliable values known for these dimensions.
However, ASME B31.3 section 304.5.3 describes a formula that can be used to calculate these values.
The minimum required thickness of a permanent blank can be calculated using the following equation.

Where

c = sum of allowances defined in section 304.1.1
dg = inside diameter of gasket for raised or flat face flanges, or the gasket pitch diameter for ring joint and fully retained gasketed flanges
E = same as defined in section 304.1.1
P = design gage pressure
S = same as defined in section 304.1.1
W = same as defined in section 304.1.1

In order to perform the calculations, it is important (necessary) to have the ASME B31.3 standard (Process Piping) available.

Remark(s) of the Author...

ASME B16.48 says.. spade handles may have no openings.

For spades that can be lifted by people, this is not a problem, but for a spade weighing hundreds of kilograms, a lifting device is required. Therefore, from a certain weight and size, a hole is usually made at the top of the handle to facilitate lifting. Many companies have their own rules for the construction of a spade handle, resulting in many different types and designs.

Raised Face Joint Blanks

ASME B16.48 says..The gasket seating surface finish and dimensions for raised face line blanks shall be in accordance with ASME B16.5. A raised face may be specified at the option of the purchaser.
A Raised Face would add machining time and complexity so the price would be higher. Call this the Bugatti or Rolls Royce of the line blind world.
Personally, I have seen that version once or twice somewhere. The version without Raised Face is the default and is used everywhere.