Round Thread Rubber Expansion Joint

The round thread rubber expansion joint is a flexible rubber expansion joint adopting a cylindrical pipe thread connection structure. The thread end is machined according to cylindrical pipe thread standards, capable of being directly screwed into pipeline systems with internal or external threads. Installation requires no flange pairing or bolt tightening, and sealing connection is achieved once screwed into position, particularly suitable for small plumbing pipelines, HVAC equipment supporting, temporary pipeline connection, and other scenarios requiring quick installation. The round thread rubber expansion joint adopts a high-elasticity rubber main body combined with an internal cord framework molded and vulcanized in one piece. The cylindrical thread end has high dimensional precision and sufficient meshing length. After screwing in, it cooperates with the rubber end face seal, providing reliable sealing that is not easy to loosen. It can efficiently absorb axial expansion and contraction, lateral offset, and angular deflection of small pipelines, buffer vibration generated by small water pumps and valves operation, reduce pipeline operating noise, and avoid the probability of loose leakage at thread connections caused by repeated stress pulling from the source.

Our factory has over 20 years of R&D and manufacturing experience in threaded rubber joints. We have conducted multiple rounds of optimization on the cylindrical pipe thread molding process and rubber end face sealing fit of round thread rubber expansion joints. The thread end dimensions are strictly machined according to relevant cylindrical pipe thread standards, ensuring interchangeability and sealing reliability with customers' existing threaded pipelines. The product nominal diameter covers DN15-DN100, with working pressure PN6-PN16, meeting the operational needs of the vast majority of small threaded pipelines. The rubber material can be selected from EPDM, NR, NBR, and other solutions, corresponding to different conveying media such as clean water and oil products. Thread standards can be customized according to customer needs, including G thread, R thread, NPT thread, and other cylindrical pipe thread specifications. For overseas plumbing equipment manufacturers, HVAC accessory wholesalers, and distributors, we support customization of special thread specifications, nominal diameters, and lengths according to drawings, and can provide thread precision test reports with the goods. Currently, round thread rubber expansion joints have been exported in batches to small plumbing and HVAC equipment projects in over 80 countries worldwide, and with the convenience of cylindrical thread quick installation and stable sealing performance, they have become regular supporting flexible joints for numerous overseas equipment manufacturers and accessory wholesalers.

The product is widely used in small plumbing pipeline thread connections, HVAC equipment thread supporting, small boiler water supply pipelines, solar hot water system pipelines, laboratory small fluid pipelines, temporary pipeline quick connections, and other scenarios, particularly suitable for small pipeline systems requiring cylindrical pipe thread quick installation without flange bolt tightening.

We offer full-chain personalized customization services. We can adjust thread standard, profile, nominal diameter, and overall product length according to thread specification drawings provided by customers. For special media, we can individually formulate rubber compounds to create special oil-resistant and acid-alkali resistant solutions. We support printing customers' own brand LOGOs and customizing exclusive outer packaging labels. Special structures such as special thread specifications, reducer threads, and extended spheres can all be independently molded for production. The customized sample development cycle is controlled at 15-20 days, and small-batch mixed orders in the industry can also be flexibly accepted, with a minimum order quantity of only 10 pieces, lowering the trial order threshold for overseas distributors. For long-term cooperating major customers, we can provide free product drawings, technical manuals, and thread selection solutions, assisting distributors in building their own threaded differentiated product matrix.

An exclusive protective packaging solution is designed for ocean shipping of small threaded products. Small-diameter products of DN50 and below are individually packed in thickened waterproof and moisture-proof cartons, with high-density foam pads filled inside to isolate products and prevent thread bump damage and mutual scratches during transportation. Full-box products are externally wrapped with waterproof plastic film, and for large-batch full-container shipments, pallet packing and reinforcement can be adopted according to customer requirements, facilitating mechanized loading and unloading at overseas warehouses. Outer packaging cartons are printed with bilingual (Chinese-English) product parameters and thread specification labels, facilitating overseas warehouse inventory and customer inspection. Long-term cooperating customers can customize their own brand outer carton printing. We have long-term cooperation with leading ocean freight forwarders, with real-time trackable logistics information throughout the process. After shipment, we synchronize bills of lading and packing lists, minimizing customer cargo transportation losses and customs clearance troubles.

For regular standard in-stock products, a 30% advance payment is required, with the remaining 70% balance settled before shipment. For customized products requiring mold opening or special thread specifications, a 50% advance deposit is required, with the balance fully settled before shipment. For single full-container large-batch purchases, tiered purchase discounts can be applied, with greater unit price discounts for larger purchase quantities. We support multi-currency cross-border settlement in US dollars, euros, British pounds, and RMB. Trade terms can be selected from EXW (Ex Works), FOB (Free On Board), and C&F (Cost and Freight), flexibly adapting to the trade operation habits of different overseas plumbing equipment manufacturers and accessory wholesalers.

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