ASME B16.5 threaded flanges, Class 300

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6" Class 300 threaded

Dimensions

Standard

Rating

Type

Units

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Threaded flanges, ASME B16.5 Class 300, dimensions in mm
DNNominal size	OFlange diameter	TfFlange thickness	XHub diameter	YLength through hub	TThread length	QCounterbore	RRaised face diameter	TrRaised face height	WBolt circle (PCD)	dBolt hole diameter	nNumber of holes	kgWeight, approx.	Enquiry list
15	95	12.7	38	23	16	23.6	34.9	2	66.7	15.9	4	0.7
20	115	14.3	48	26	16	29	42.9	2	82.6	19	4	1.2
25	125	15.9	54	27	18	35.8	50.8	2	88.9	19	4	1.4
32	135	17.5	64	27	21	44.4	63.5	2	98.4	19	4	1.9
40	155	19.1	70	31	23	50.3	73	2	114.3	22.2	4	2.8
50	165	20.7	84	34	29	63.5	92.1	2	127	19	8	3.3
65	190	23.9	100	39	32	76.2	104.8	2	149.2	22.2	8	4.6
80	210	27	117	43	32	92.2	127	2	168.3	22.2	8	6.3
90	230	28.6	133	45	37	104.9	139.7	2	184.2	22.2	8	7.8
100	255	30.2	146	48	37	117.6	157.2	2	200	22.2	8	10.2
125	280	33.4	178	51	43	144.4	185.7	2	235	22.2	8	12.9
150	320	35	206	53	47	171.4	215.9	2	269.9	22.2	12	15	In the viewer
200	380	39.7	260	62	51	222.2	269.9	2	330.2	25.4	12	26
250	445	46.1	321	67	56	276.2	323.8	2	387.4	28.6	16	37.5
300	520	49.3	375	73	61	328.6	381	2	450.8	31.7	16	52
350	585	52.4	425	77	64	360.4	412.8	2	514.4	31.7	20	72
400	650	55.6	483	83	69	411.2	469.9	2	571.5	34.9	20	100
450	710	58.8	533	89	70	462	533.4	2	628.6	34.9	24	126
500	775	62	587	96	74	512.8	584.2	2	685.8	34.9	24	138
600	915	68.3	702	107	83	614.4	692.2	2	812.8	41.3	24	213

Dimensions in mm, for reference. Tolerances and full requirements as per the applicable standard. Confirm against your specification before ordering.

Source: Shiv Shakti Machine Tools Flange Catalogue, edition 2026 (draft), page 9, weights page 15. “–” means the catalogue lists no value.

[CONFIRM: table checked and signed off by the owners (unverified)][CONFIRM: whether the flange thickness includes the raised face]