Screwed Flanges

This flange is referred to as either threaded or screwed. It is used to connect other threaded components in low pressure, non-critical applications.

Types of Screwed Flanges

The various types of threaded flanges are as follows:

• Plain Threaded Flanges
• Female Threaded Flanges
• Male Threaded Flanges

No welding is required.

Threaded Flanges can be used in very high pressure services and their major advantage is that they can be assembled without welding.

Uses of threaded flanges :

Threaded flanges are threaded in the bore which match an external thread on the pipe. Threaded flanges are used with pipes that have external threads. The benefit of these flanges is that it can be attached without welding.

• Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
• They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
• They are ideal for small diameter piping applications.
• They are economical and time saving devices.
• These threaded flanges are normally designed for non-cyclic applications.
• The flanges are suitable to be used in applications where welding is hazardous.
• They can be used in highly explosive areas.

Threaded flanges are often used for small diameter, high pressure requirements. thread flanges with a hub have published specifications that range from 1/2″ thru 24″.

• Size: 1/2” to 60”, DN 12mm to DN 1500mm
• Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
• Facing: RF / RTJ

ASME/ANSI B16.5 Class 150 TH

Nominal Pipe Size	Outside Diameter of Flange	Diameter of Raised Face	Thickness of Flanges Min.	Diameter of Hub	Length Through Hub	Thread Length Threaded Min.	Bore	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Approximate Weight kgs
NPS	O	R	tf	X	Y	T	B	W	I	n
1/2	90	34.9	9.6	30	14	16	22.2	60.3	15.9	4	0.41
3/4	100	42.9	11.2	38	14	16	27.7	69.9	15.9	4	0.59
1	110	50.8	12.7	49	16	17	34.5	79.4	15.9	4	0.82
1 1/4	115	63.5	14.3	59	19	21	43.2	88.9	15.9	4	0.99
1 1/2	125	73.0	15.9	65	21	22	49.5	98.4	15.9	4	1.28
2	150	92.1	17.5	78	24	25	61.9	120.7	19.1	4	2.01
2 1/2	180	104.8	20.7	90	27	29	74.6	139.7	19.1	4	3.41
3	190	127.0	22.3	108	29	30	90.7	152.4	19.1	4	3.88
3 1/2	215	139.7	22.3	122	30	32	103.4	177.8	19.1	8	4.80
4	230	157.2	22.3	135	32	33	116.1	190.5	19.1	8	5.45
5	255	185.7	22.3	164	35	36	143.8	215.9	22.2	8	6.22
6	280	215.9	23.9	192	38	40	170.7	241.3	22.2	8	7.57
8	345	269.9	27.0	246	43	44	221.5	298.5	22.2	8	12.42
10	405	323.8	28.6	305	48	49	276.2	362.0	25.4	12	16.47
12	485	381.0	30.2	365	54	56	327.0	431.8	25.4	12	26.80
14	535	412.8	33.4	400	56	57	359.2	476.3	28.6	12	35.21
16	595	469.9	35.0	457	62	64	410.5	539.8	28.6	16	44.61
18	635	533.4	38.1	505	67	68	461.8	577.9	31.8	16	49.19
20	700	584.2	41.3	559	71	73	513.1	635.0	31.8	20	62.62
24	815	692.2	46.1	663	81	83	616.0	749.3	34.9	20	88.23

Material:

• Cabon steel: A105, A350 LF2
• Stainless steel: A182 F304/F304L/F316/F316L/F321
• Alloy steel: F11, F12

Type:Threaded Flanges, TH Flanges, Plain threaded flanges, Female threaded flanges, Male threaded flanges

Packing: plywood case and plywood pallet