This straight connector fitting is one of the most frequently produced items in our workshop. However, don't let its simple appearance fool you-it actually demands a rather high level of machining precision. Its primary function is to facilitate the addition or replacement of components within piping systems; it relies on threaded connections for secure fastening-a process that, while not overly complex, requires meticulous attention to fit and tolerance.
Regarding materials, we typically utilize carbon steel-specifically standard #20 steel. Should clients have specific requirements, we are also capable of manufacturing these fittings using #45 steel or Q235B. Prior to shipment, every unit undergoes a normalizing heat treatment process to relieve internal stresses; without this step, prolonged exposure within a piping system could lead to material fatigue and cracking. The practical difference this makes in real-world applications is quite significant.
In terms of dimensions, the specific model I have on hand features a large-end outer diameter of 57.7 mm, a small-end outer diameter of 51 mm, and an overall length of 71 mm. However, to be honest, these specifications are not rigid; the thread pitch, length, and wall thickness can all be customized to match your existing piping infrastructure. A particularly practical design feature is that this connector can be either directly welded onto the main pipeline or simply threaded into place, thereby eliminating the need for secondary processing-such as flaring or tapping-on the pipeline itself. Field installation personnel should find this feature results in considerable time and effort savings.
Regarding quality assurance, every unit undergoes rigorous inspection-including the use of "Go/No-Go" gauges and hydrostatic pressure testing-before leaving our facility. Our internal standard mandates a pass rate exceeding 99.5%, and we ensure excellent interchangeability among parts within the same production batch; our CNC machining precision controls consistently achieve a CPK value of ≥1.33. While these figures may not appear earth-shattering, they represent a highly stable and reliable level of quality for small-scale fittings of this nature.
A brief introduction to our factory: We are Taizhou Tongda Machinery, a company with 35 years of specialized experience in precision machining. Our facility occupies a land area of 5,000 square meters, with an actual workshop floor space of 10,000 square meters-thanks to a two-story layout where the ground floor is dedicated to machining operations, while the upper floor houses assembly and quality inspection departments. Out of our 150-person workforce, 50 employees are exclusively dedicated to quality control and process support-a ratio that stands significantly higher than the industry average among our local peers.
We do not position ourselves as a "universal factory" that accepts every conceivable type of job. In our earlier years, we primarily supplied hydraulic fittings to commercial vehicle axle manufacturers in the Zhejiang and Jiangsu regions; over time, we gradually integrated into the supply chains for passenger vehicles. We currently serve as a Tier-2 supplier for several major automotive OEMs (Original Equipment Manufacturers), specializing in the provision of various fittings for vehicle braking systems. In 2024, our sales revenue reached 61 million, with approximately one-quarter of that figure attributed to exports to the European aftermarket.
Regarding certifications, in addition to the automotive industry standard IATF 16949, we also hold ISO 14000 for environmental management and ISO 45001 for occupational health and safety. We also possess the necessary pollutant discharge permits; our surface treatment workshop (featuring an eco-friendly phosphating line) was upgraded just two years ago and has successfully passed multiple inspections by the Environmental Protection Bureau. If you require EU-compliant EN 10204 3.1 material certificates, we can readily provide them, as records for every furnace batch number are meticulously archived.
To be frank, when purchasing these straight connector fittings, you need not be overly concerned about quality issues-we utilize the exact same production line to supply major OEMs, ensuring that our quality standards remain absolutely identical.
Shipping and Discounts
Our standard shipping terms are EXW or FOB. For first-time collaborations, I recommend FOB; we ship from either the Port of Ningbo or Shanghai, handling all export documentation in-house to streamline the customs clearance process on your end.
Payment Terms
A 50% upfront deposit is required, with the remaining 50% to be settled prior to shipment. Please note that final payment is due *before* the goods are loaded into the container-not upon their arrival at your destination. Once we have received the final balance, we will provide you with video footage of the loading process and photographs of the sealed containers.
Discounts
Pricing can be somewhat complex, as the unit price is contingent upon three primary factors: quantity (the unit price decreases as the quantity of a *specific* specification increases-quantities of different sizes cannot be aggregated for volume discounts), product dimensions, and the prevailing market price of steel at the time the order is placed. Given the significant volatility of carbon steel prices, specific discount rates must be negotiated dynamically based on current market conditions.
However, for your reference: for a single order exceeding 5,000 units, the unit price can be reduced by approximately 15% compared to the sample price; for orders exceeding 20,000 units, the price reduction may exceed 25%. We welcome you to contact us directly for specific figures; we believe in full transparency and have nothing to hide.
Product Parameter Table
|
Parameter |
Value / Spec |
|
Product Name |
Straight Connector Fitting |
|
Thread Spec |
Customizable |
|
Big Diameter |
57.7 mm |
|
Small Diameter |
51 mm |
|
Length |
71 mm |
|
Width |
/ |
|
Height |
/ |
|
Thickness |
/ |
|
Connection Type |
Threaded (tightening) |
|
Material |
Carbon steel |
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