Class 300 Flanges

A class 300 flange can be created from various materials like stainless steel, carbon steel, mild steel, alloy steel, etc. and is resistant to abrasion & corrosion with high durability. Flanges such as American standard flanges, British standard flanges, German standard flanges, Indian Standard Flanges & Japanese Standard Flanges created using above mentioned materials have separate pressure ratings.

Welding neck flanges

Slip on flanges

Blind flanges

Threaded flanges

Lap joint flanges

Socket weld flanges

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DIMENSIONS OF CLASS 300 FLANGES (ANSI B 16.5) (in mm)
Nominal Pipe Size		Flange Dia 'O'	Dia of Bolt Circle 'A'	Dia of Bolt Holes 'D'	No. of Holes	Thk of Flange 'C'	Diameter at Weld Bevel 'S'	Dia of Hub 'E'	Length Through Hub			Bore 'B'		Dia of R/F R	Depth of Socket F	Length of Threading
Nominal Pipe Size		Flange Dia 'O'	Dia of Bolt Circle 'A'	Dia of Bolt Holes 'D'	No. of Holes	Thk of Flange 'C'	Diameter at Weld Bevel 'S'	Dia of Hub 'E'	S/O & S/W Y	W/N Y	L/J Y	S/O & S/W B	L/J B	Dia of R/F R	Depth of Socket F	Length of Threading
1/2''	15	95.2	66.7	15.9	4	14.3	21.3	38.1	22.2	52.4	22.2	22.3	22.9	34.9	9.5	15.9
3/4''	20	117.5	82.5	19.0	4	15.9	26.7	47.6	25.4	57.1	25.4	27.7	28.2	42.9	11.1	15.9
1''	25	123.8	88.9	19.0	4	17.5	33.5	54.0	27.0	61.9	27.0	34.5	35.0	50.8	12.7	17.5
1 ¼''	32	133.3	98.4	19.0	4	19.0	42.2	63.5	27.0	65.1	27.0	43.2	43.7	63.5	14.3	20.6
1 ½''	40	155.6	114.3	22.2	4	20.6	48.3	69.8	30.2	68.3	30.2	49.5	50.0	73.0	15.9	22.2
2''	50	165.1	127.0	19.0	8	22.2	60.4	84.1	33.3	69.8	33.3	62.0	62.5	92.1	17.5	25.4
2 ½''	65	190.5	149.2	22.2	8	25.4	73.1	100.0	38.1	76.2	38.1	74.7	75.4	104.8	19.0	28.6
3''	80	209.5	168.3	22.2	8	28.6	88.9	117.5	42.9	79.4	42.9	90.7	91.4	127.0	20.6	30.2
3 ½''	90	228.5	184.2	22.2	8	30.2	101.6	133.4	44.5	81.0	44.5	103.4	104.1	140.0	20.6	31.7
4''	100	254.0	200.0	22.2	8	31.8	114.3	146.0	47.6	85.7	47.6	116.1	116.8	157.2	23.8	33.3
5''	125	279.4	234.9	22.2	8	34.9	141.2	177.8	50.8	98.4	50.8	143.8	144.5	185.7	-	36.5
6''	150	317.5	269.9	22.2	12	36.5	168.4	206.4	52.4	98.4	52.4	170.7	171.4	215.9	-	39.7
8''	200	381.0	330.2	25.4	12	41.3	219.2	260.3	61.9	111.1	61.9	221.5	222.2	269.9	-	44.4
10''	250	444.5	387.3	28.6	16	47.6	273.0	320.7	66.7	117.5	95.2	276.3	277.4	323.8	-	49.2
12''	300	520.7	450.8	31.7	16	50.8	323.8	374.6	73.0	130.2	101.6	327.1	328.2	381.0	-	55.6
14''	350	584.2	514.3	31.7	20	54.0	355.6	425.4	76.2	142.9	111.1	359.1	360.2	412.7	-	57.1
16''	400	647.7	571.5	34.9	20	57.2	406.4	482.6	82.5	146.0	120.6	410.5	411.2	469.9	-	63.5
18''	450	711.2	628.5	34.9	24	60.3	457.2	533.4	88.9	158.7	130.2	461.8	462.3	533.4	-	68.3
20''	500	774.7	685.8	34.9	24	63.5	508.0	587.4	95.2	161.9	139.7	513.1	514.3	584.2	-	73.0
24''	600	914.4	812.8	41.3	24	69.8	609.6	701.7	106.4	168.3	152.4	615.9	615.9	692.1	-	82.5

Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 300

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