The Stainless Steel Internal And External Thread Conversion Sleeve is the "universal connector" among Straight Thread Sleeves. Just glance at the Nut And Sleeve Size Comparison Table to find the right size, Screw it on easily, and your needs will be met.

Wuxi Feisheng Hardware Products Co., Ltd. is located in the beautiful city of Wuxi, on the shores of Lake Taihu, within the Meicun Industrial Park of Wuxi Xinwu District.  It's just a 5-minute drive from the Wuxi East Expressway exit, situated in the heart of the Yangtze River Delta economic zone, a region blessed with exceptional natural and cultural resources. The company specializes in the research, development, production, sales, and service of Wire thread inserts, Self-tapping thread inserts, and related tools, and is currently one of the few manufacturers with three thread insert production lines.

Since its establishment, the company has been committed to meeting customers' actual needs and providing them with the highest quality thread inserts.  We adhere to a quality policy of continuous improvement, strictly following national, military, and aerospace standards, and have developed our own product testing standards and procedures.

To further improve product quality and ensure stability, the company continuously introduces advanced domestic and international technologies and equipment, achieving fully automated production processes. Throughout the entire production process, at predetermined intervals, multi-level testing is conducted using advanced high-precision measuring instruments. We firmly believe that a good product requires meticulous attention to detail at every stage, ensuring the performance and quality of each batch of thread inserts with a craftsman's spirit, providing customers with first-class products and continuously exceeding their expectations.

Through the continuous efforts of the Feisheng team, Feisheng thread inserts have been widely used in aerospace, high-speed rail, automobile manufacturing, power generation, machinery, 5G, and general machinery die casting. In particular, our company stands out in the new energy vehicle industry; our thread inserts are used in many electric vehicles on the road today. Our goal in the thread insert field is to become the leader in the Asian thread insert industry, a professional thread insert manufacturer, and an industry leader. We welcome new and old customers and friends to visit our factory for guidance and cooperation!

In 2003, it passed ISO9001:2000 international quality system certification

In 2018, it passed the ISO/TS16949 quality management system certification

Aviation system certification in 2021

Add:FengEr Road 38# Meichun Street XinWu District WuXi city  JiangSu Province

Fax: +86-510-83796863

Brand domestic sales: Ms. Yang  +86-13815109735

International Trade: Mr. Liu  +86-15961756595

Fastening system solution: Mr. Li  +86-13771186996

Website: www.wxfslt.com

Email: wxlikenai@163.com

Wechate：15961756595

In the vast system of industry, threads are undoubtedly the most basic yet also the most stubborn language. When a precision instrument from Europe needs to work with local standard parts, when the thread specifications of spare parts at the repair site don't match the damaged base hole, when designers try to achieve precise connection control on heavy structural components, the helplessness when facing different thread systems is as frustrating as holding an imperial wrench only to find a metric nut in front of you. It is in these awkward moments of “talking past each other" that the stainless steel internal/external thread converter sleeve, with its unique form, appears. Like a translator fluent in various dialects, it allows thread specifications that were originally unable to communicate to communicate smoothly, weaving new connection possibilities without damaging the existing structure.

This sleeve has a geometrically beautiful appearance; it is a hollow metal cylinder, usually precision-machined or cold-forged from stainless steel bars, exuding a cool and enduring metallic luster. Its ingenuity lies in the dual-thread design of its inner and outer walls—the outer wall is engraved with a thread matching the pre-set base hole, which can be a coarse standard thread profile to obtain sufficient pull-out resistance in thick substrates; the inner wall is machined with a different specification of precision thread, waiting to accept screws with smaller diameters and different pitches. It's like a microscopic threaded bridge, one end rooted in the existing hole, the other providing a place for the new connector, turning seemingly impossible combinations like "large hole with small screw" or "coarse thread with fine thread" into a stable and reliable mechanical reality.

In actual operation, the flexibility exhibited by this conversion sleeve is often surprisingly good. Imagine an expensive aluminum alloy housing whose original threaded hole has stripped and failed due to Long-term use. Conventionally, this might require replacing the entire component or performing complex and expensive welding repairs. However, with a stainless steel internal/external thread conversion sleeve, technicians only need to clean and enlarge the damaged hole, firmly screw in the larger-diameter sleeve, and instantly rebuild a small but equally strong internal thread at that location. What were originally only compatible with large Bolts can now be secured to more precise instrument components via the fine threads inside the sleeve, both saving the base material and meeting new assembly requirements. This ability to turn the impossible into possible makes it a lifesaver in equipment maintenance.

Besides repair and adaptation, this sleeve also plays a crucial role in optimizing the structure during the original design phase. In composite material components that require a balance between strength and precision, designers often face a dilemma: the external threads need to be robust to ensure tensile strength in soft materials, while the assembled parts come with fine standard screws. In this case, pre-embedding the adapter sleeve into the injection-molded or die-cast base allows the external, aggressive threads to deeply engage the molding material for anchoring, while the internal, fine threads accommodate the precision screws, thus resolving the conflict between structural strength and connection accuracy in one fell swoop. In piPing systems, it serves as a crucial hub connecting pipes of different standards, allowing imperial thread valves to gracefully connect to metric thread pipes. The corrosion resistance of stainless steel ensures that this cross-standard connection remains sealed and stable even under long-term fluid erosion.

The choice of material gives this adapter sleeve a durability exceeding that of ordinary adapters. Stainless steel not only provides its enduring resistance to rust but also offers sufficient mechanical strength to withstand the complex stresses applied by both internal and external threads. In marine equipment, chemical plants, or food processing machinery, this sleeve does not leach harmful substances, nor does it rust or jam in humid environments. Its stable physical properties ensure that the accuracy of thread conversion does not deteriorate over time. It transforms temporary emergency solutions into permanent, reliable connections, freeing up designs that had to compromise due to standard differences.

From rescuing valuable equipment on the verge of obsolescence to weaving interfaces between different standard systems in the global supply chain, the stainless steel internal/external thread adapter sleeve embodies the wisdom of industrial connectivity with its inclusive approach. It tells us that the true art of engineering lies not in forcing uniformity, but in creating possibilities—finding that solid and elegant fulcrum among seemingly irreconcilable differences, so that different specifications, different standards, and different demands can ultimately reach a reconciliation at the same connection point and be tightly interlocked.