We specialize in SAE/BSP/METRIC hydraulic adapters and fittings.

How are high-quality hydraulic adapters produced


1.Material Cutting: The first step in manufacturing hydraulic adapters is cutting the raw materials. NJ has its own raw material workshop, where we mainly cut straight hexagonal materials using our saws. Of course, we also purchase raw materials directly from the raw material factory. Compared to some European countries that use bar stock, we prefer to use forged blanks. On the one hand, forging blanks not only reduce production costs but also provide more competitive prices to our customers. On the other hand, one-piece blanks are more reliable in terms of quality.

2.Turning: Blanks with a preliminary shape are mounted on a lathe for turning operations. Turning involves placing the workpiece under a rotating tool to gradually machine it into the required external profile. This step ensures that the fittings' shape and dimensions meet design requirements.

3.Drilling: Internal holes need to be machined within the fittings. These holes are typically used for thread connect, hose pipe connect, or other hydraulic components. Drilling machines are commonly used for this purpose, and NJ has over 90 drilling machines.

4.Thread Machining: Threads are one of the criteria for assessing the quality of a hydraulic fitting. NJ typically employs thread rolling and tapping processes to ensure excellent sealing performance with other hydraulic adapters and fittings.

5.Heat Treatment: Some steel fittings may require heat treatment to enhance their strength and hardness, such as the 0319 series sleeves. This may include processes like quenching, tempering, or annealing, depending on the material and design requirements.

6.Quality Inspection: Our products undergo sampling inspections at every production step, and semi-finished products undergo more rigorous sampling. If a significant issue is detected, a full inspection is conducted. Inspection equipment includes thread gauges, go and stop gauges, calipers, micrometers, projectors, pressure testers, and more.

7.Surface Treatment: Considering the growing international emphasis on environmental protection, NJ's surface treatment not only takes into account corrosion resistance and surface smoothness but also ensures environmental friendliness. We typically use trivalent chromium environmentally friendly zinc plating, nickel plating, zinc-nickel plating, and other processes to meet the 120-hour salt spray test requirements.

8.Assembly: Machined and electroplated parts are assembled using methods like threaded connections, crimping, wire insertion, and more. Simultaneously, we inspect the smoothness of the product's surface and check for burrs and impurities inside the holes while packaging. If any issues are found, they are promptly addressed, further ensuring the quality of our products.

In addition to the above, there are many other machining processes such as boring, chamfering, and thread milling, among others. These machining processes and steps are crucial in determining the quality of hydraulic fittings and adapters, which is why NJ rigorously controls every step to provide customers with peace of mind and confidence."

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-86 15706836862
151 Hongxing Road, Chunhu Street, Fenghua District, Ningbo City, Zhejiang Province, China, 315506.
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Contact person: Fenny He
Tel: +86 15706836862
Contact person: Ting He
WhatsApp:+86 15606680672
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