The Japanese standard lap joint stub end is the exclusive core pipe fitting for Japanese-style loose flange detachable piping systems. It is specially designed for pipe networks under Japanese Industrial Standards and is widely used in Japa
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The Japanese standard lap joint stub ends we produce are manufactured according to JIS B2321 Japanese Industrial Standard, and are integrally formed from a straight pipe section and an outward-flared sealing ring at the end. During installation, the pipe body is butt-welded to the pipeline, and paired with a Japanese standard loose flange that slides freely, rotates, and locks, without the need to rotate the pipe body itself, which can reduce the torsional stress and high-altitude alignment deviation caused by traditional welded flanges. The product nominal diameter adopts the Japanese A series specifications, covering 15A–1500A, wall thicknesses include STD, XS, SCH series, and pressure ratings cover 5K, 10K, 16K, 20K. The materials are Japanese standard dedicated grades, including SS400 carbon steel, SUS304/SUS316L stainless steel, STPA23/STPA24 alloy steel, and SUS329 duplex steel. The forming processes are divided into three categories: seamless hot pressing, rolled welding, and forged machining. The flared edge has a uniform rounded transition, the end face is flat, and dimensional tolerances and bevel angles are controlled according to Japanese standard requirements, and can be interchanged with Japanese standard flanges of the same specifications worldwide.
| Product Name | JIS Stub End |
| Product Categories | Flanges & Stub Ends |
| The parameters of this series of Japanese standard lap joint stub ends fully comply with the authoritative JIS B2321 Japanese Industrial Standard, and are suitable for Japanese pipeline engineering design and acceptance specifications worldwide. Specification range | Japanese standard nominal diameter 15A–1500A (DN15–DN1500), divided into long-type and short-type two Japanese-standard structural dimensions, adopting the Japanese-specific pipe outer diameter system. Pressure ratings cover the full range of Japanese core 5K, 10K, 16K, 20K levels; wall thicknesses include STD standard wall thickness, XS extra-heavy wall thickness, and SCH series high-pressure wall thickness. Mainstream Japanese-standard-specific materials: SS400 carbon steel, SUS304/SUS316L stainless steel, STPA23/STPA24 chrome-molybdenum alloy steel, SUS329 duplex steel. Forming processes: seamless hot-press integrated forming, steel plate rolled and welded forming, forged precision machined forming. Pipe end bevel, flanged outer diameter, sealing surface flatness, and fillet radius strictly implement Japanese |
| Customization | Our factory possesses full-dimension Japanese-standard precision upgrade and non-standard customization capabilities for Japanese-standard lap joint stub ends, and can undertake various Japanese-style modifications, precision non-standard dimensions, special working conditions, and high-end process customization orders from around the world, adapting to the special Japanese-engineering needs of Japan proper and Southeast Asia. Supports precision modification of Japanese-standard conventional dimensions, and can customize Japanese-style non-standard straight pipe lengths, thickened precision flanged sealing surfaces, dedicated fillet radii, and non-standard precision bevel angles, adapting to Japanese-style narrow installation spaces and high-end precision high-pressure sealing working conditions. Can upgrade Japanese-style high-end processes on demand, including STPA alloy steel high-temperature heat treatment, duplex steel solution anti-corrosion treatment, stainless steel mirror precision polishing, and carbon steel hot-dip galvanizing weather-resistance upgrade, matching Japanese-style high-temperature, strong-corrosion, and clean-precision harsh working conditions. Supports extra-large-diameter special-shaped flanges, |
| MOQ | Our factory's Japanese-standard lap joint stub ends adopt a Japanese-style foreign-trade flexible ultra-low minimum order quantity model, adapting to diverse needs such as replenishment in Japan proper, spare parts for Southeast Asian Japanese-style EPC projects, foreign-trade precision sample orders, full-container bulk distribution, and sporadic procurement for Japanese-style engineering. Domestic and overseas Japanese-style general conventional specifications, including 15A–600A mainstream nominal diameters, STD standard wall thickness, SS400 carbon steel/SUS |
| Lead Time | The factory has established a dedicated precision foreign-trade production line for Japanese-standard pipe fittings and a constant-temperature dust-free export warehouse, regularly stocking massive quantities of Japanese-standard lap joint stub ends that are hot-selling in Japan and Southeast Asia, and rapidly responding to urgent delivery needs of Japanese-style overseas engineering projects worldwide. Market hot-selling 15A–600A, STD conventional wall thickness, SS400 carbon steel, SUS304 stainless steel long and short type Japanese-standard lap joint stub ends are all in stock warehousing |
| Packaging | Japanese-standard lap joint stub ends adopt Japanese-style export high-end precision protective packaging, customized for the cross-border sea transportation and precision pipe fitting transport needs of Japan and Southeast Asia, eliminating problems such as transport deformation, end-face scratches, precision dimensional deviation, and moisture-induced rust. Small 15A–100A small-diameter stub ends are individually affixed with high-end dust-proof protective film and fully wrapped with thickened double-layer bubble wrap, with high-strength hard sealing protective caps installed at pipe ends, focusing on protecting precision welding bevels and flanged sealing end faces, eliminating precision loss caused by dust and moisture. Medium 125A–600A specification products are wholly covered with waterproof and rust-proof thickened woven fabric, with all corners comprehensively reinforced and protected, avoiding surface wear and minor deformation caused by cross-border bumps. Large 800A and above large-diameter lap joint stub ends adopt fumigated solid wood pallets for flexible securing |
| Reference Price | Inquiry |
We adopt a Japanese-style foreign trade flexible minimum order model, and can undertake replenishment orders in Japan proper, supplementary parts for Japanese EPC projects in Southeast Asia, foreign trade sample orders, full-container bulk distribution, and small-lot procurement for Japanese-style engineering projects. Regular specifications 15A–600A, STD standard wall thickness, SS400 carbon steel and SUS304 stainless steel long and short type products are in stock; please contact us to confirm specific inventory status and delivery time. The factory has a dedicated production line for Japanese-standard pipe fittings and a constant-temperature dust-free export warehouse, and can respond to urgent delivery needs. Packaging is graded by caliber: 15A–100A uses dust-proof protective film and double-layer bubble wrap for full wrapping, with hard sealing protective caps added to pipe ends; 125A–600A is fully covered with waterproof and rust-proof woven fabric and reinforced at corners; 800A and above uses fumigated solid wood pallets with flexible fixing, multi-point steel strap reinforcement, and double-layer waterproof sealed wrapping, and the pallets comply with Japanese and international quarantine standards. All products are stacked by model, material, and pressure rating, affixed with Japanese-English bilingual traceability labels, and each batch is accompanied by Chinese-Japanese bilingual certificates of conformity, MTC material reports, and precision flaw detection inspection documents.
Before sales, we provide Japanese-standard specification selection, long and short type model matching, 5K/10K/16K/20K pressure rating adaptation, and material working condition consultation, assisting in confirming the matching relationship between Japanese-style models and working conditions. During sales, we synchronize production, Japanese-standard compliance re-inspection, export packaging, and cross-border logistics customs clearance progress, and provide documents required for Chinese-Japanese bilingual engineering acceptance and customs clearance. After sales, we provide an 18-month international warranty period. During the warranty period, for precision dimensional deviations, end face deformation, process defects, or sealing leakage problems not caused by human installation errors, we provide free replacement and reissue and bear cross-border logistics losses. We are equipped with a 24-hour Japanese-style pipe fitting technical team, which can provide Japanese-standard pipeline installation guidance, loose flange pairing and debugging, Japanese-style pipe network working condition optimization, and remote troubleshooting services.
The mainstream pressure ratings for Japanese-style engineering are 5K, 10K, 16K, and 20K. 10K is the general conventional rating, 20K is suitable for Japanese-style high-pressure process pipelines, and 5K is suitable for low-pressure fluids and conventional water supply and drainage pipe networks. Please contact us to confirm the rating selection for specific projects.
The long type is suitable for Japanese-style high-temperature, large thermal displacement, and significant alternating temperature difference precision pipelines in the electric power and chemical industries, with better buffering performance; the short type has a compact structure and is suitable for Japanese-style equipment matching and room-temperature precision piping projects with limited space. If you are unsure about the selection, you are welcome to provide the pipeline working conditions, and we will assist in confirming.
We strictly implement the latest Japanese standard specification JIS B2321, and the dimensional tolerances, flanging thickness, fillet radius, and groove accuracy are controlled according to Japanese engineering requirements, and can be interchanged with Japanese flanges of the same specifications worldwide.
Yes. We support precision modification of conventional Japanese standard sizes, including non-standard straight pipe lengths, thickened flanged sealing surfaces, dedicated fillet radii, and non-standard groove angles; we can also upgrade as needed with STPA alloy steel heat treatment, duplex steel solution anti-corrosion treatment, stainless steel mirror precision polishing, carbon steel hot-dip galvanizing, and other processes. Please provide the specific dimensions, materials, and quantity, and we will assist in confirming the plan.
We adopt a Japanese-style foreign trade flexible minimum order model, and can accept sample orders, replacement part orders, and full-container bulk orders. Conventional specifications 15A–600A, STD standard wall thickness, SS400 carbon steel, and SUS304 stainless steel long and short type products are in stock. Please contact us to confirm the specific minimum order quantity and delivery time.
Protection by amperage tier: 15A–100A use dust-proof protective film and double-layer bubble wrap for full coverage, with hard sealed protective caps added to the pipe openings; 125A–600A are fully wrapped in waterproof and rust-proof woven fabric with reinforced corners; 800A and above use fumigated solid wood pallets with flexible securing, multi-point steel strap reinforcement, and double-layer waterproof sealed wrapping. Each batch is accompanied by a Chinese-Japanese bilingual certificate of conformity, MTC material report, and precision flaw detection inspection documents.
We provide an 18-month international warranty period. During the warranty period, for precision dimensional deviations, end-face deformation, process defects, or sealing leakage problems not caused by human installation error, we provide free replacement and reshipment and bear cross-border logistics losses. At the same time, we are equipped with a 24-hour technical team that can provide installation guidance and remote troubleshooting.
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