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Special unions and adaptors for Bottles, GAS, NPT and Solder (U1, U3, UP3-G, US3)

Adaptors and special union fittings

Turned brass from hexagonal drawn bars. SAE Flare 45°

Primary material: Drawn brass EN 12164

Standard and regulation reference: PED 97/23/CE, RoHS 2002/95/CE, REACH Reg. 1907/2006, EN378-2:2008, SAE-FIT, SAE 45° J513-92, NPT ANSI B.1.20.1, BSPP ISO 228-1:2003, BSW ISO 529:1993

Application: Suitable for air-conditioners and refrigerating systems that work with refrigerant proper to the group II Article 9, 2.2 of the PED Directive 97/23/CE, referring to the Directive 67/548/CEE. ( tested with the following: R12, R22, R134a, R404A, R407C, R410A, R502, R507, CO2 R744, R32 ). Not suitable for Ammonia R717

Working condition:
Max working pressure 45 bar (650 psi)
Temperature range -40°C to +150°C (-40°F to 300°F)

Recommended fitting condition:
Brazing temperature < 700°C (1300°F) for brass connections

Risk category according to Pressure Equipment Directive PED 97/23/CE: Article 3 Paragraph 3

U1 straight unions SAE NPT m

Drawing Part number Connections A
(mm)
Hex
(mm)
    external thread
(male)
external thread
(male)
   
U1 U1-4A SAE 1/4"
7/16"-20 UNF
NPT 1/8″ 33 12
U1-4B SAE 1/4"
7/16"-20 UNF
NPT 1/4″ 38 14
U1-6B SAE 3/8"
5/8"-18 UNF
NPT 1/4″ 41 17
U1-6C SAE 3/8"
5/8"-18 UNF
NPT 3/8″ 41 17
U1-8C SAE 1/2"
3/4"-16 UNF
NPT 3/8″ 45 20
U1-8D SAE 1/2"
3/4"-16 UNF
NPT 1/2″ 50 22
U1-10D SAE 5/8"
7/8"-14 UNF
NPT 1/2″ 54 23
U1-12F SAE 3/4"
1.1/16"-14 UNS
NPT 3/4″ 58 27
U1-16H SAE 1"
1.1/4"-12 UNF
NPT 1″ 68 36

 

U3 straight unions SAE NPT f

Drawing Part number Connections A
(mm)
Hex
(mm)
    external thread
(male)
internal thread
(female)
   
U3 U3-4A SAE 1/4"
7/16"-20 UNF
NPT 1/8″ 29 14

 

UP3 straight unions SAE GAS BSP

Drawing Part number Connections A
(mm)
Hex
(mm)
    SAE Flare
7/16″-20 UNF
BSPP ISO 228
(Gas)
   
UP3 UP3-4G4F SAE 1/4"
external thread
(male)
G-1/4"
internal thread
(female)
33 20
UP3-4G4M SAE 1/4"
internal thread
(female)
G-1/4"
external thread
(male)
32 17

 

Tube brazing connection I.D. internal diameter,  O.D. external diameter
US3 straight unions SAE ODF

    Connections    
Drawing Part number external thread
(male)
O.D.
mm
O.D.
inch
A
(mm)
Hex
(mm)
US3 US3-44 SAE 1/4"
7/16"-20 UNF
  1/4" 27 12
US3-4M8 8mm   27 12
US3-66 SAE 3/8"
5/8"-18 UNF
  3/8" 33 17
US3-6M10 10mm   33 17
US3-8M12 SAE 1/2"
3/4"-16 UNF
12mm   35 20
US3-88   1/2" 35 20
US3-1010 SAE 5/8"
7/8"-14 UNF
16mm 5/8" 42 23
US3-12M18 SAE 3/4"
1.1/16"-14 UNS
18mm   46 27

 

U3X straight unions SAE BSW

Drawing Part number Connections A
(mm)
Hex
(mm)
    SAE Flare
7/16″-20 UNF
BSW ISO 529
(Withworth)
   
U3X U3-4DX SAE 1/4″
external thread
(male)
W21,8-14 dx
(thread right)
29 27