Inconel 601 Blind Flange Size And Weight

This article details the complete dimensional specifications and weight calculations for Inconel 601 blind flanges manufactured to the ASME B16.5 standard across all pressure classes, from 150 to 2500.

Tables below provide complete data per ASME B16.5-2020. Dimensions in inches; weights in pounds.

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	3.50	0.44	1.38	2.38	4	0.63	2
¾	3.88	0.50	1.69	2.75	4	0.63	2
1	4.25	0.56	2.00	3.13	4	0.63	2
1¼	4.63	0.63	2.50	3.50	4	0.63	3
1½	5.00	0.69	2.88	3.88	4	0.63	4
2	6.00	0.75	3.63	4.75	4	0.75	5
2½	7.00	0.88	4.13	5.50	4	0.75	8
3	7.50	0.94	5.00	6.00	4	0.75	9
3½	8.50	0.94	5.50	7.00	8	0.75	12
4	9.00	0.94	6.19	7.50	8	0.75	15
5	10.00	0.94	7.31	8.50	8	0.88	19
6	11.00	1.00	8.50	9.50	8	0.88	24
8	13.50	1.13	10.63	11.75	8	0.88	42
10	16.00	1.19	12.75	14.25	12	1.00	67
12	19.00	1.25	15.00	17.00	12	1.00	102
14	21.00	1.38	16.25	18.75	12	1.13	125
16	23.50	1.44	18.50	21.25	16	1.13	160
18	25.00	1.56	21.00	22.75	16	1.25	200
20	27.50	1.69	23.00	25.00	20	1.25	265
22	29.50	1.81	25.25	27.25	20	1.38	315
24	32.00	1.88	27.25	29.50	20	1.38	430

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	3.75	0.56	1.38	2.63	4	0.63	3
¾	4.63	0.63	1.69	3.25	4	0.75	4
1	4.88	0.69	2.00	3.50	4	0.75	4
1¼	5.25	0.75	2.50	3.88	4	0.75	5
1½	6.13	0.81	2.88	4.50	4	0.88	7
2	6.50	0.88	3.63	5.00	8	0.75	9
2½	7.50	1.00	4.13	5.88	8	0.88	13
3	8.25	1.13	5.00	6.63	8	0.88	16
3½	9.00	1.19	5.50	7.25	8	0.88	20
4	10.00	1.25	6.19	7.88	8	0.88	27
5	11.00	1.38	7.31	9.25	8	0.88	33
6	12.50	1.44	8.50	10.63	12	0.88	43
8	15.00	1.63	10.63	13.00	12	1.00	71
10	17.50	1.88	12.75	15.25	16	1.13	111
12	20.50	2.00	15.00	17.75	16	1.25	157
14	23.00	2.13	16.25	20.25	20	1.25	210
16	25.50	2.25	18.50	22.50	20	1.38	270
18	28.00	2.38	21.00	24.75	24	1.38	330
20	30.50	2.50	23.00	27.00	24	1.38	410
22	33.00	2.63	25.25	29.25	24	1.63	485
24	36.00	2.75	27.25	32.00	24	1.63	600

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	3.75	0.63	1.38	2.63	4	0.63	3
¾	4.63	0.69	1.69	3.25	4	0.75	4
1	4.88	0.75	2.00	3.50	4	0.75	5
1¼	5.25	0.81	2.50	3.88	4	0.75	6
1½	6.13	0.88	2.88	4.50	4	0.88	8
2	6.50	1.00	3.63	5.00	8	0.75	11
2½	7.50	1.13	4.13	5.88	8	0.88	15
3	8.25	1.25	5.00	6.63	8	0.88	19
3½	9.00	1.31	5.50	7.25	8	1.00	25
4	10.00	1.38	6.19	7.88	8	1.00	32
5	11.00	1.50	7.31	9.25	8	1.00	40
6	12.50	1.63	8.50	10.63	12	1.00	52
8	15.00	1.88	10.63	13.00	12	1.13	87
10	17.50	2.13	12.75	15.25	16	1.25	136
12	20.50	2.38	15.00	17.75	16	1.38	200
14	23.00	2.63	16.25	20.25	20	1.38	265
16	25.50	2.75	18.50	22.50	20	1.50	340
18	28.00	3.00	21.00	24.75	24	1.50	420
20	30.50	3.25	23.00	27.00	24	1.63	520
22	33.00	3.50	25.25	29.25	24	1.75	625
24	36.00	3.75	27.25	32.00	24	1.88	750

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	3.75	0.56	1.38	2.63	4	0.63	3
¾	4.63	0.63	1.69	3.25	4	0.75	4
1	4.88	0.69	2.00	3.50	4	0.75	5
1¼	5.25	0.81	2.50	3.88	4	0.75	6
1½	6.13	0.88	2.88	4.50	4	0.88	8
2	6.50	1.00	3.63	5.00	8	0.75	11
2½	7.50	1.13	4.13	5.88	8	0.88	15
3	8.25	1.25	5.00	6.63	8	0.88	19
3½	9.00	1.38	5.50	7.25	8	1.00	25
4	10.75	1.50	6.19	8.50	8	1.00	38
5	13.00	1.75	7.31	10.50	8	1.13	59
6	14.00	1.88	8.50	11.50	12	1.13	70
8	16.50	2.19	10.63	13.75	12	1.25	110
10	20.00	2.50	12.75	17.00	16	1.38	180
12	22.00	2.63	15.00	19.25	20	1.38	225
14	23.75	2.75	16.25	20.75	20	1.50	275
16	27.00	3.00	18.50	23.75	20	1.63	380
18	29.25	3.25	21.00	25.75	20	1.75	460
20	32.00	3.50	23.00	28.50	24	1.75	570
22	34.25	3.75	25.25	30.63	24	1.88	670
24	37.00	4.00	27.25	33.00	24	2.00	810

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	4.75	0.94	1.38	3.25	4	0.88	6
¾	5.13	1.00	1.69	3.50	4	0.88	7
1	5.88	1.13	2.00	4.00	4	1.00	10
1¼	6.25	1.13	2.50	4.38	4	1.00	11
1½	7.00	1.25	2.88	4.88	4	1.13	14
2	8.50	1.50	3.63	6.50	8	1.00	24
2½	9.63	1.63	4.13	7.50	8	1.13	32
3	9.50	1.50	5.00	7.50	8	1.00	27
4	11.50	1.75	6.19	9.25	8	1.25	45
5	13.75	2.00	7.31	11.00	8	1.38	67
6	15.00	2.19	8.50	12.50	12	1.25	82
8	18.50	2.50	10.63	15.50	12	1.50	140
10	21.50	2.75	12.75	18.50	16	1.50	200
12	24.00	3.13	15.00	21.00	20	1.50	275
14	25.25	3.38	16.25	22.00	20	1.63	315
16	27.75	3.50	18.50	24.25	20	1.75	385
18	31.00	4.00	21.00	27.00	20	2.00	525
20	33.75	4.25	23.00	29.50	20	2.13	640
22	36.00	4.50	25.25	31.50	20	2.25	740
24	41.00	4.50	27.25	35.50	20	2.50	940

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	4.75	0.94	1.38	3.25	4	0.88	6
¾	5.13	1.00	1.69	3.50	4	0.88	7
1	5.88	1.13	2.00	4.00	4	1.00	10
1¼	6.25	1.13	2.50	4.38	4	1.00	11
1½	7.00	1.25	2.88	4.88	4	1.13	14
2	8.50	1.50	3.63	6.50	8	1.00	24
2½	9.63	1.63	4.13	7.50	8	1.13	32
3	10.50	1.88	5.00	8.00	8	1.25	43
4	12.25	2.13	6.19	9.50	8	1.38	62
5	14.75	2.38	7.31	11.50	8	1.63	96
6	15.50	2.75	8.50	12.50	12	1.50	115
8	19.00	3.25	10.63	15.50	12	1.75	200
10	23.00	3.75	12.75	19.00	12	2.00	320
12	26.50	4.25	15.00	22.50	16	2.00	450
14	29.50	4.63	16.25	25.00	16	2.25	575
16	32.50	5.00	18.50	27.75	16	2.50	715
18	36.00	5.50	21.00	30.50	16	2.75	920
20	38.75	6.00	23.00	33.00	16	3.00	1110
22	41.75	6.50	25.25	35.50	16	3.25	1320
24	46.00	6.75	27.25	40.00	16	3.50	1610

NPS	OD	Thickness	RF Dia	Bolt Circle	No. Holes	Hole Dia	Approx. Weight (lb)
½	5.25	1.19	1.38	3.50	4	0.88	9
¾	5.50	1.25	1.69	3.75	4	0.88	10
1	6.25	1.38	2.00	4.25	4	1.00	13
1¼	7.25	1.50	2.50	5.13	4	1.13	19
1½	8.00	1.75	2.88	5.75	4	1.25	26
2	9.25	2.00	3.63	6.75	8	1.13	37
2½	10.50	2.25	4.13	7.75	8	1.25	51
3	12.00	2.63	5.00	9.00	8	1.38	73
4	14.00	3.00	6.19	10.75	8	1.63	110
5	16.50	3.63	7.31	12.75	8	2.00	175
6	19.00	4.25	8.50	14.50	8	2.25	255
8	21.75	5.00	10.63	17.25	12	2.25	370
10	26.50	6.00	12.75	21.25	12	2.75	630
12	30.00	6.75	15.00	24.38	12	3.13	870
14	32.00	7.25	16.25	26.13	12	3.38	1010
16	34.75	7.75	18.50	28.63	16	3.38	1190
18	38.00	8.50	21.00	31.50	16	3.75	1490
20	40.25	9.00	23.00	33.75	16	4.00	1700
22	43.50	9.50	25.25	36.50	16	4.25	1980
24	47.00	10.50	27.25	40.00	16	4.50	2410

The physical dimensions of a flange are standardized by ASME B16.5 and are identical regardless of material. The difference lies in the material's density.

Calculating the Weight of Inconel 601 Blind Flange

Step-by-Step Calculation Method:

Determine the Reference Weight: Obtain the approximate weight for a carbon steel blind flange of your specific NPS and Pressure Class from a standard chart (e.g., 100 lbs for a 10" Class 300 flange).

Apply the density ratio:

Density of Carbon Steel: ~7.85 g/cm³

Density of Inconel 601: 8.10 g/cm³

Weight Ratio = 8.10 / 7.85 ≈ 1.032

Calculate Inconel 601 Weight: Multiply the carbon steel weight by the density ratio.

Inconel 601 Weight = Carbon Steel Weight × 1.032

Example: 100 lbs (carbon steel) × 1.032 = 103. 2 lbs (Inconel 601)

This calculation confirms that an Inconel 601 blind flange weighs approximately 3.2% more than its carbon steel counterpart of identical size and class. This is a critical factor for logistics, structural support design, and cost estimation.

Authentic Production: Fully traceable from raw ingot to finished product.

Expertise: Decades in nickel alloys ensure optimal heat treatment for creep resistance.

Quality Assurance: ISO 9001 certified; full MTC and NDT reports included.

Performance Edge: Superior to Inconel 600 in oxidizing environments.

Rapid Delivery: Stock for common sizes; custom forging in 4–6 weeks.

For quotes, drawings, or application advice, reach out. Our Inconel 601 blind flanges provide the reliability your critical systems demand.