**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
This **Brass Union Tee** is specifically designed for use with **SAE J844 A and Type B nylon tubing** in air brake systems and cab air control applications. It is machined from **CA360 brass**, ensuring durability and reliability under various conditions.
One of the key advantages of this fitting is its **easy assembly**—no tube preparation or flaring is required. It features a built-in tube support, making it ideal for quick and secure installations. For copper tubing, simply replace the nut, sleeve, and insert with a long nut and spherical sleeve, and remove the insert for proper function.
**Specifications:**
- Meets **D.O.T. FMVSS 571.106** air brake standards
- Complies with **SAE J246** and **SAE J1131** automotive tube fitting requirements
- **Working Pressure:** 150 P.S.I.
- **Working Temperature Range:** -40°F to 200°F
**Assembly Instructions:**
1. Cut the tube to your desired length.
2. Slide the nut and then the sleeve onto the tube, ensuring the threaded end of the nut faces the fitting body.
3. Insert the tube into the pre-assembled fitting, making sure it is fully seated.
4. Tighten the nut to the specified torque as shown in the table below.
**Torque Requirements (Additional Turns from Hand-Tight):**
| Tube Size | Additional Turns |
|---------------|------------------|
| 3/16 | 2-1/2 |
| 1/4 | 3 |
| 3/8 & 1/2 | 4 |
| 5/8 & 3/4 | 3-1/2 |
**Tube O.D. to Thread Size Matching Chart:**
| Tube O.D. | Thread Size |
|-----------|-----------------|
| 1/4 | 7/16-24 |
| 3/8 | 17/32-24 |
| 1/2 | 11/16-20 |
| 5/8 | 13/16-18 |
| 3/4 | 1-1/8 |
**Part Number & Dimensions 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 |
**Note:** The above sizes are for reference only. Custom sizes are available upon request.
For more details, please refer to the product images below:
Whether you're working on heavy-duty air brake systems or need reliable fittings for cabin controls, this brass union tee is an excellent choice for performance, safety, and ease of use.
This category includes aprons for kitchen use, coffee shop use, outdoor barbecue use, or painting use.
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