Stainless Steel JIS Hydraulic Adapters Manufacturer & Wholesale Supplier
Hydraxio manufactures precision stainless steel JIS hydraulic adapters engineered to JIS B 8363 and JIS B 0202 standards. Designed for Japanese and Asian hydraulic systems, our adapters ensure reliable metal-to-metal or 30° flare sealing performance.
Manufactured in AISI 304, 316, and 316L stainless steel, JIS adapters provide excellent corrosion resistance and dimensional accuracy for high-pressure industrial applications.
We supply global distributors, OEM manufacturers, and hydraulic equipment brands with stable quality and consistent lead times.
Quick Details
Size Range: 1/8″ – 2″
Thread Type: JIS BSPP / JIS 30° Flare / Metric (depending on type)
Material Grades: AISI 304 / 316 / 316L
Sealing Type: 30° Cone / Metal-to-Metal
Pressure Rating: Up to 420–630 Bar (depending on size)
Standard: JIS B 8363 / JIS B 0202
OEM Service: Custom configurations & private labeling available
Types of Stainless Steel JIS Hydraulic Adapeters
Stainless steel JIS hydraulic adapters are designed in accordance with JIS B 8363 standards, featuring a 30° flare sealing surface commonly used in Japanese hydraulic systems.
Manufactured in AISI 304, 316, and 316L stainless steel, these adapters provide excellent corrosion resistance and reliable metal-to-metal sealing performance in high-pressure industrial applications.
Available in JIS 30° flare and JIS BSPP thread configurations to ensure compatibility with Japanese and Asian hydraulic equipment.
JIS Male 30° Flare to BSPT Male Adapter
Available in sizes 1/8″–2″.
Used to connect two BSP threaded hydraulic components.
JIS Male 30° Flare to BSPT 45° Elbow
Available in sizes 1/8″–2″.
Designed to convert male BSP threads to female BSP ports.
JIS Male 30° Flare to BSPT Male 90° Elbow
Available in sizes 1/8″–2″.
Connects BSP male threads to NPT female hydraulic ports.
Thread Size Chart of JIS Fittings(BSPP-JIS B 0202)
JIS hydraulic fittings commonly utilize BSPP (parallel) threads in combination with a 30° flare sealing surface in accordance with JIS B 8363 standards. Unlike standard BSP pipe fittings, JIS fittings rely on a 30° metal-to-metal flare seat for secure sealing performance.
The table below provides standard JIS BSPP thread sizes and dimensional references for accurate identification and compatibility with Japanese hydraulic systems.
All stainless steel JIS adapters are manufactured in compliance with JIS B 0202 thread specifications to ensure proper fit and interchangeability.
| Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread O.D (in) |
|---|---|---|---|---|
| 1/8 | -2 | 1/8 – 28 | 3/8 | 11/32 |
| 1/4 | -4 | 1/4 – 19 | 33/64 | 15/32 |
| 3/8 | -6 | 3/8 – 19 | 21/32 | 19/32 |
| 1/2 | -8 | 1/2 – 14 | 13/16 | 3/4 |
| 5/8 | -10 | 5/8 – 14 | 7/8 | 13/16 |
| 3/4 | -12 | 3/4 – 14 | 1 1/32 | 31/32 |
| 1 | -16 | 1 – 11 | 1 5/16 | 1 7/32 |
| 1 1/4 | -20 | 1 1/4 – 11 | 1 21/32 | 1 9/16 |
| 1 1/2 | -24 | 1 1/2 – 11 | 1 7/8 | 1 25/32 |
| 2 | -32 | 2 – 11 | 2 11/32 | 2 1/4 |
Pressure Rating of JIS Hydraulic Adapters
Stainless steel JIS hydraulic adapters are designed for high-pressure hydraulic systems utilizing a 30° flare metal-to-metal sealing surface in accordance with JIS B 8363 standards.
Working pressure depends on dash size, material grade, and connection type. Proper installation and torque control are essential to ensure secure sealing performance.
The table below provides standard working pressure reference values for JIS hydraulic fittings manufactured to JIS B 0202 thread specifications.
| Thread Size (G) | Tube OD (mm) | Pressure Rating – Carbon Steel (MPa) | Pressure Rating – Stainless Steel (MPa) |
|---|---|---|---|
| G 1/8 | 6 | 31.5 | 25 |
| G 1/4 | 8 | 31.5 | 25 |
| G 3/8 | 10 | 25 | 20 |
| G 1/2 | 12 | 25 | 20 |
| G 5/8 | 14 | 21 | 17.5 |
| G 3/4 | 16 | 21 | 17.5 |
| G 1 | 22 | 16 | 13 |
| G 1-1/4 | 28 | 13 | 10 |
| G 1-1/2 | 35 | 10 | 8.0 |
| G 2 | 42 | 6.3 | 5.0 |
Notes
JIS hydraulic fittings commonly use BSPP (G) threads with a 60° cone seat for sealing.
These are parallel threads, and sealing is typically achieved via a metal-to-metal cone or an O-ring, not by thread interference.
Thread dimensions and tolerances follow JIS B 0202, which aligns with ISO 228-1.
Applications of Stainless Steel JIS Hydraulic Fittings
Stainless steel JIS hydraulic fittings are widely used in high-pressure hydraulic systems requiring 30° flare metal-to-metal sealing and reliable performance under vibration and dynamic loads.
Manufactured according to JIS B 8363 standards, these fittings are commonly applied in Japanese and Asian hydraulic equipment where dimensional accuracy and corrosion resistance are essential.
Japanese Construction Machinery
Excavators, loaders, and mobile hydraulic equipment designed to JIS standards.
Oil & Gas Equipment
High-pressure hydraulic lines exposed to aggressive environments.
Marine & Shipbuilding
Saltwater-resistant hydraulic systems requiring corrosion protection.
Agricultural Equipment
Tractors and harvesting systems operating in outdoor and high-moisture environments.
Industrial Hydraulic Systems
Long-term durability in factory hydraulic operations.
Chemical Processing Industry
Stainless steel performance in corrosive fluid systems.
Frequently Asked Questions
JIS hydraulic adapters are fittings designed according to JIS B 8363 standards, featuring a 30° flare metal-to-metal sealing structure. They are commonly used in Japanese and Asian hydraulic systems.
JIS fittings use a 30° flare sealing angle, while JIC fittings use a 37° flare design under SAE J514 standards. Although both may use BSPP threads, the sealing angle is different and they are not interchangeable.
JIS hydraulic adapters typically use BSPP parallel threads manufactured in accordance with JIS B 0202 specifications. Sealing is achieved through the 30° flare seat rather than thread interference.
No. While JIS fittings may use BSPP threads, their sealing method is based on a 30° flare seat. Standard BSP fittings rely on O-ring, bonded seal, or tapered thread sealing, making them incompatible in most cases.
Our JIS adapters are manufactured in AISI 304, 316, and 316L stainless steel, offering excellent corrosion resistance for industrial, marine, and high-pressure applications.
JIS hydraulic fittings are widely used in Japanese construction machinery, marine equipment, agricultural machinery, and industrial hydraulic systems across Asia and global OEM markets.
Why Partner with Hydraxio for Stainless Steel Hydraulic Fittings?
✔ 20+ Years Stainless Steel Specialization
✔ 50+ CNC Precision Machines
✔ ISO-Certified Production & Inspection
✔ Global Bulk Supply to 50+ Countries
✔ OEM & Brand-Compatible Solutions
