2026/ 09/ 22
All three share the same bore sizes and the same JIS-compliant piston design — the difference that matters is working pressure. Here is how 15B, 5H and HJ2 compare.
I. One Family, Three Pressure Classes
15B, 5H and HJ2 are all JIS-standard hydraulic cylinders sharing the same bore range, ø32 to ø100, and the same basic construction: a hard-chrome-plated S45C piston rod, buffered and non-buffered types, and a range of mounting styles. What sets them apart is the pressure they are built for.
II. 15B — 14 MPa
The high-pressure member of the family, rated to 14 MPa. Choose 15B when the application genuinely needs high force from a compact bore — heavy clamping, pressing or high-load actuation.
III. 5H — 5 MPa
The general-purpose JIS hydraulic cylinder, rated to 5 MPa, with the widest range of mounting styles (side base, foot bracket, clevis, flange, trunnion). This is the default choice for standard industrial hydraulic actuation that does not need 15B's high pressure.
IV. HJ2 — Compact
HJ2 shares the 5H's basic construction in a more compact envelope, with the magnetic sensor embedded directly in the cylinder body rather than mounted externally. Choose HJ2 when space around the cylinder is tight.
V. Quick Decision Guide
Tell us your required force, bore size and mounting constraints via Contact Us, and we will confirm the right cylinder.
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