**Product Specifications for 966 Brass Union Tee for Air Brake**
**Model No.:** 979-4-2: 7/16-24
**Certificate:** SAE J246 & SAE J1131
**Straight Thread:** 7/16-24
**Working Temperature:** -40°F to 200°F (-40°C to 93°C)
**Trademark:** WANLI
**Specification:** JASS
**Origin:** Taizhou
**HS Code:** 7412201000
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### **Application**
This brass union tee is designed for use with SAE J844 A and Type B nylon tubing in air brake systems and cab air controls. It is ideal for applications requiring reliable, leak-proof connections in high-pressure environments.
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### **Advantages**
- Machined from CA360 brass for durability and corrosion resistance.
- Easy to assemble—no tube preparation or flaring required.
- Built-in tube support ensures a secure connection.
- Can be adapted for copper tubing by replacing the nut, sleeve, and insert with a long nut and spherical sleeve. The insert should be removed when using copper tubing.
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### **Specifications**
- Meets D.O.T. FMVSS 571.106 air brake specifications.
- Complies with functional requirements of SAE automotive tube fitting standards: SAE J246 and SAE J1131.
- Working Pressure: 150 P.S.I.
- Working Temperature: -40°F to 200°F (-40°C to 93°C)
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### **Assembly Instructions**
1. Cut the tube to the desired length.
2. Slide the nut and then the sleeve onto the tube, ensuring the threaded end of the nut faces toward the fitting body.
3. Insert the tube into the pre-assembled fitting until it is fully seated.
4. Tighten the nut to the recommended torque as shown in the table below.
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### **Tube Size to Thread Matching Chart**
| Tube O.D. | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 |
|-----------|-----|-----|-----|-----|-----|
| Thread Size | 7/16-24 | 17/32-24 | 11/16-20 | 13/16-18 | 1-1/8 |
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### **Torque Tightening Guide**
| Tube Size | Additional Number Of Turns From Hand-tight |
|-----------|---------------------------------------------|
| 3/16 | 2-1/2 |
| 1/4 | 3 |
| 3/8 & 1/2 | 4 |
| 5/8 & 3/4 | 3-1/2 |
---
### **Part Number Table**
| Part No. | Tube Size | Pipe Thread | Straight Thread |
|------------|-----------|-------------|------------------|
| 979-4-2 | 1/4 | 1/8 | 7/16-24 |
| 979-4-4 | 1/4 | 1/4 | 7/16-24 |
| 979-6-2 | 3/8 | 1/8 | 17/32-24 |
| 979-6-6 | 3/8 | 3/8 | 17/32-24 |
| 979-6-8 | 3/8 | 1/2 | 17/32-24 |
| 979-8-4 | 1/2 | 1/4 | 11/16-20 |
| 979-8-6 | 1/2 | 3/8 | 11/16-20 |
| 979-8-8 | 1/2 | 1/2 | 11/16-20 |
| 979-10-6 | 5/8 | 3/8 | 13/16-18 |
| 979-10-8 | 5/8 | 1/2 | 13/16-18 |
| 979-12-8 | 3/4 | 1/2 | 1-18 |
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### **Note**
The above dimensions are for reference only. Custom sizes can be made upon request.
**Images Available:**
[Image 1](http://i.bosscdn.com/uploads/38/6e/fe/e5dd8b5fb852ae8132123525dc.jpg)
[Image 2](http://i.bosscdn.com/uploads/32/f1/b2/a7fc0adea9bdca03dab91a8433.jpg)
[Image 3](http://i.bosscdn.com/uploads/70/ee/4b/2fffb136858121a71cfb1dfdde.jpg)
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This product is suitable for a wide range of industrial and commercial air brake systems where reliability, performance, and ease of installation are essential.
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