What is threaded union?

Threaded union is primarily used for maintenance and installation purposes. It is a screwed joint design and it consists of three interconnected pieces. Two internally threads and a centerpiece that draws the ends together when rotated.

SizeClassDimensionSpecification1/4″ to 4″2000, 3000, 6000, 9000ANSI B 16.11

ASTM A 182

ASME SA182

Stainless Steel Threaded Union

ASTM / ASME SA A182 F304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L

Carbon Steel Threaded Union

ASTM/ ASME A 105, ASTM/ ASME A 350 LF 2

Alloy Steel Threaded Union

ASTM / ASME A182 F1/ F5/ F9/ F11/ F22/ F91

Nickel Alloy Threaded Union

ASTM / ASME SB 336 UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276)

Copper Alloy Steel Threaded Union

ASTM / ASME SB 111 UNS NO. C 10100 , C 10200 , C 10300 , C 10800 , C 12000, C 12200, C 70600 , C 71500 ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10) , C 71500 ( CU -NI- 70/30)

Duplex Steel Threaded Union

ASTM A 182 – F 51, F53, F55 S 31803, S 32205, S 32550, S 32750, S 32760

Product name : threaded union

1/8″ to 3 ” class 3000 and 1/2″ to 2″ class 6000Class 3000 1/81/43/81/23/411 1/41 1/222 1/23A1 11/161 11/161 27/3222 5/162 7/162 7/833 1/24 1/24 7/16B1 31/641 31/641 11/161 15/162 3/82 25/323 23/643 23/324 27/645 15/646 5/32C53/6453/6411 3/161 15/321 25/322 7/322 35/643 1/163 9/164 9/32D25/3225/3231/321 3/321 5/321 3/81 45/641 7/82 1/162 3/82 7/16E7/167/167/167/169/169/169/169/1611/167/81F0.4200.5550.6900.8551.0651.3301.6751.9152.4062.9063.535 0.4300.5650.7000.8651.0751.3401.6851.9252.4162.9213.550 Class 6000 1/81/43/81/23/411 1/41 1/22 A1 11/151 27/3222 5/162 7/162 7/833 1/24 1/8B1 31/641 11/161 15/162 3/82 25/323 23/643 23/324 27/645 15/64C53/6411 3/161 15/321 25/322 7/322 35/643 1/163 9/16D25/3231/321 3/321 5/321 3/81 45/641 7/82 1/162 3/8E7/167/167/169/169/169/169/1611/167/8F0.4200.5550.6900.8551.0651.3301.6751.9152.406 0.4300.5650.7000.8651.0751.3401.6851.9252.416Note: “C” dimension is across octagon corners or a diameter as applicable.The 2.1/2″ and 3″ 3000LB and 2″ 6000LB sizes have octagonal male and female ends; the other sizes are round.