
Air Brake Nylon Tubing Male Branch Tee
| Part# | Tube O.D* Male NPTF1*2*3 |
PARKER | EATON | MAF | DIXON |
| 1583-33C | 3/16*3/16*1/8 | VS272NTA-3-2 | 72NAB32VS | ||
| 1583-44C | 1/4*1/4*1/8 | VS272NTA-4-2 | 1472x4 | 38136 | 72NAB42VS |
| 1583-44D | 1/4*1/4*1/4 | VS272NTA-4-4 | 38137 | 72NAB44VS | |
| 1583-66C | 3/8*3/8*1/8 | VS272NTA-6-2 | 1472x6x6x2 | 38138 | 72NAB62VS' |
| 1583-66D | 3/8*3/8*1/4 | VS272NTA-6-4 | 1472x6 | 38132 | 72NAB64VS |
| 1583-64D | 3/8*1/4*1/4 | VS272NTA-6-4-4 | 1472x6x4x4 | 38139 | |
| 1583-66E | 3/8*3/8*3/8 | VS272NTA-6-6 | 1472x6x6x6 | 38140 | 72NAB66VS |
| 1583-88D | 1/2*1/2*1/4 | VS272NTA-8-4 | 1472x8x8x4 | 38133 | 72NAB84VS |
| 1583-88E | 1/2*1/2*3/8 | VS272NTA-8-6 | 1472x8 | 38141 | 72NAB86VS |
| 1583-88F | 1/2*1/2*1/2 | VS272NTA-8-8 | 38142 | 72NAB88VS | |
| 1583-1010F | 5/8*5/8*1/2 | VS272NTA-10-8 | 38143 | 72NAB108VS |
| Part# | Tube O.D* Male NPTF1*2*3 |
Tectran | Automann | Fleet Pride | Fairview | Tramec Sloan |
| 1583-33C | 3/16*3/16*1/8 | 1372-3A | N72-3-2 | |||
| 1583-44C | 1/4*1/4*1/8 | 1372-4A | 177.14724A | N72-4-2 | 1472-4A | S772AB-4-2 |
| 1583-44D | 1/4*1/4*1/4 | 1372-4B | 177.14724B | N72-4-4 | 1472-4B | |
| 1583-66C | 3/8*3/8*1/8 | 1372-6A | 177.14726A | N72-6-2 | 1472-6A | S772AB-6-2 |
| 1583-66D | 3/8*3/8*1/4 | 1372-6B | 177.14726B | N72-6-4 | 1472-6B | S772AB-6-4 |
| 1583-64D | 3/8*1/4*1/4 | 1372-6AB | ||||
| 1583-66E | 3/8*3/8*3/8 | 1372-6C | 177.14726C | N72-6-6 | 1472-6C | S772AB-6-6 |
| 1583-88D | 1/2*1/2*1/4 | 1372-8B | N72-8-4 | 1472-8B | S772AB-8-4 | |
| 1583-88E | 1/2*1/2*3/8 | 1372-8C | 177.14728C | N72-8-6 | 1472-8C | S772AB-8-6 |
| 1583-88F | 1/2*1/2*1/2 | 1372-8D | 177.14728D | N72-8-8 | 1472-8D | S772AB-8-8 |
| 1583-1010F | 5/8*5/8*1/2 | 1372-10D | 177.147210D | N72-10-8 | S772AB-10-8 |
Background, the need for external connections in rigid systems
The Male Branch Tee (male branch tee) was born out of the urgent need to synergize rigid external connections with dynamic sealing in industrial systems. in the mid-to-late 20th century, with the complexity of heavy machinery and aerospace hydraulic systems, the traditional all-flexible or all-rigid tee was unable to meet the following scenarios:
(1) Branch rigid connection: The main tube for nylon tube and other flexible piping, and the branch needs to be directly connected to the metal equipment with internal threads (such as hydraulic cylinders, high-pressure pumps), to avoid the risk of leakage caused by multiple transfers.
(2) High-frequency vibration tolerance: Engineering machinery or aircraft in a high-frequency vibration environment requires the requirements of the branch pipe threads with self-locking anti-loosening ability, beyond the reliability of the traditional gasket sealing.
(3) Extreme pressure compatibility: The Branch needs to withstand higher pressure than the main (such as a hydraulic pilot system), and the requirements of the external threaded interface of the metal-metal seal to withstand transient pressure impact.
Technological breakthroughs, from split to integrated design
(1) Transition program (1960s-1980s):
Split adapter kits: weld male fittings to standard tee stub ends, but welds are prone to cracking due to fatigue (e.g., early solutions in SAE J514 standard).
Threaded Bushing Nesting: External joints are achieved by nesting internal and external threads, but add weight and potential leak points, and do not meet compact space requirements.
(2) Integration revolution (1990s):
In 1992, the German MAN Group and hydraulic manufacturer Bosch Rexroth jointly developed the first integrated Male Branch Tee, the branch end of the metric male thread + taper seals, the main end of the retained nylon ferrule interface, to achieve the "decoupling of rigid and flexible mechanics".
2000s: ISO 1179 standard incorporates it into the threaded interface specification, requiring the male branch end to pass 100,000 vibration cycles.
Comparison of Mechanics Philosophy with Female Branch Tee:
|
Dimension |
Male Branch Tee |
Female Branch Tee |
|
Mechanical transfer path |
Rigid output from a branch, flexible cushioning from the main |
Branch rigid input, main flexible transfer |
|
Failure mode |
Fatigue fracture of branch pipe threads predominates |
Leakage of branch pipe sealing surfaces predominates |
|
Dynamic Adaptability |
Self-locking advantage in high-vibration environments |
The advantage of ease of maintenance under static sealing |
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