JRA Hydro-Pneumatic Boosting Cylinder
Standard Hydro-Pneumatic Booster Cylinder JRA
Technical Specifications
Performance
| Output Force Range | 1–40 Tons (custom to 150T) |
| Boost Ratio | Up to 50:1 (model dependent) |
| Total Stroke | 10–300 mm |
| Boost (Power) Stroke | 5–50 mm |
| Repeatability | ±0.02 mm |
| Pre-press Speed | 50–500 mm/s |
| Boost Speed | 5–50 mm/s |
| Cycle Frequency | 25–45 cycles/min |
Pneumatic & Fluid
| Operating Pressure | 4–7 kgf/cm² (0.4–0.7 MPa) |
| Actuation Type | Double-acting |
| Hydraulic Fluid | VG68# anti-wear hydraulic oil |
| Air Cylinder Pressure Rating | 30 kgf/cm² |
| Oil Cylinder Pressure Rating | 120 kgf/cm² |
| Air Port Size | G3/8" – G1/2" (bore dependent) |
| Working Temperature | 0–60 °C |
| Lubrication | Oil-internal (sealed system) |
Mechanical
| Bore Sizes | ∅63, 80, 100, 125, 160 mm |
| Body Material | Aluminum alloy / steel |
| Mounting Orientation | Vertical (standard), horizontal (JRAA variant) |
| Rod End Thread | M22×1.5 – M30×1.5 (bore dependent) |
| Air Stroke Tolerance | +1.00 / 0.00 mm |
| Boost Stroke Tolerance | +0.20 / 0.00 mm |
| Seal Type | Multi-stage composite seals |
| Custom Options | Up to 150T, special strokes, mounting |
Force vs. Displacement Profile
The JRA delivers two distinct force regimes in one cycle. Fast approach uses low air force for speed; the boost phase triggers high-force oil intensification over the final millimeters.
Pneumatic Circuit Diagram
The JRA uses two solenoid valves (DT1/DT2) to independently control the pre-press air cylinder and the boost intensifier. This 4-port design enables the two-stage force profile.
Mounting Configurations
The JRA platform supports multiple mounting orientations. The standard JRA is vertical-down; the JRAA variant is built for horizontal installation.
Vertical Mount (JRA Standard)
Rod-down installation on press frames, C-frames, and benchtop fixtures. The most common configuration for staking, riveting, and press-fit operations.
Horizontal Mount (JRAA Variant)
Rod-forward horizontal installation for inline pressing, slide mechanisms, and fixture integration where vertical space is limited. Reservoir orientation optimized for horizontal use.
Inverted / Custom Mount
Rod-up or angled installation for special press designs. Available as custom order with modified reservoir and port orientation. Contact engineering for application review.
Installation Dimensions
Standard JRA mounting dimensions by bore size. Total length N varies with total stroke and boost stroke. Full CAD drawings (DWG/STEP) available on request.
| Model | Force | Overall Length (retracted) | Flange Width (across flats) | Center Locating Diameter | Flange Outer Diameter | Piston Rod Diameter | Mounting Hole (n×∅) | Rod End Thread | Air Port Thread |
|---|---|---|---|---|---|---|---|---|---|
| JRA-63-50-5L-1T | 1T | 310 | 240 | 50 | 80 | 25 | 4-∅9 | M22×1.5 | G3/8" |
| JRA-63-100-10L-1T | 1T | 360 | 240 | 50 | 80 | 25 | 4-∅9 | M22×1.5 | G3/8" |
| JRA-63-150-10L-1T | 1T | 410 | 240 | 50 | 80 | 25 | 4-∅9 | M22×1.5 | G3/8" |
| Model | Force | Overall Length (retracted) | Flange Width (across flats) | Center Locating Diameter | Flange Outer Diameter | Piston Rod Diameter | Mounting Hole (n×∅) | Rod End Thread | Air Port Thread |
|---|---|---|---|---|---|---|---|---|---|
| JRA-80-100-10L-3T | 3T | 350 | 240 | 60 | 100 | 30 | 4-∅11 | M26×1.5 | G3/8" |
| JRA-80-100-10L-5T | 5T | 350 | 240 | 60 | 100 | 30 | 4-∅11 | M26×1.5 | G3/8" |
| JRA-80-150-15L-5T | 5T | 400 | 240 | 60 | 100 | 30 | 4-∅11 | M26×1.5 | G3/8" |
| JRA-80-200-20L-5T | 5T | 450 | 240 | 60 | 100 | 30 | 4-∅11 | M26×1.5 | G3/8" |
| Model | Force | Overall Length (retracted) | Flange Width (across flats) | Center Locating Diameter | Flange Outer Diameter | Piston Rod Diameter | Mounting Hole (n×∅) | Rod End Thread | Air Port Thread |
|---|---|---|---|---|---|---|---|---|---|
| JRA-100-100-10L-10T | 10T | 400 | 280 | 75 | 120 | 35 | 4-∅13 | M30×1.5 | G1/2" |
| JRA-100-150-15L-10T | 10T | 450 | 280 | 75 | 120 | 35 | 4-∅13 | M30×1.5 | G1/2" |
| JRA-100-200-20L-10T | 10T | 500 | 280 | 75 | 120 | 35 | 4-∅13 | M30×1.5 | G1/2" |
| JRA-100-250-20L-10T | 10T | 550 | 280 | 75 | 120 | 35 | 4-∅13 | M30×1.5 | G1/2" |
| Model | Force | Overall Length (retracted) | Flange Width (across flats) | Center Locating Diameter | Flange Outer Diameter | Piston Rod Diameter | Mounting Hole (n×∅) | Rod End Thread | Air Port Thread |
|---|---|---|---|---|---|---|---|---|---|
| JRA-125-100-10L-15T | 15T | 440 | 320 | 90 | 150 | 40 | 4-∅13 | M33×1.5 | G1/2" |
| JRA-125-150-15L-20T | 20T | 490 | 320 | 90 | 150 | 40 | 4-∅13 | M33×1.5 | G1/2" |
| JRA-125-200-20L-20T | 20T | 540 | 320 | 90 | 150 | 40 | 4-∅13 | M33×1.5 | G1/2" |
| JRA-125-300-30L-20T | 20T | 640 | 320 | 90 | 150 | 40 | 4-∅13 | M33×1.5 | G1/2" |
| Model | Force | Overall Length (retracted) | Flange Width (across flats) | Center Locating Diameter | Flange Outer Diameter | Piston Rod Diameter | Mounting Hole (n×∅) | Rod End Thread | Air Port Thread |
|---|---|---|---|---|---|---|---|---|---|
| JRA-160-100-10L-30T | 30T | 500 | 380 | 110 | 180 | 50 | 4-∅17 | M42×2 | G3/4" |
| JRA-160-150-15L-30T | 30T | 550 | 380 | 110 | 180 | 50 | 4-∅17 | M42×2 | G3/4" |
| JRA-160-200-20L-40T | 40T | 600 | 380 | 110 | 180 | 50 | 4-∅17 | M42×2 | G3/4" |
| JRA-160-300-30L-40T | 40T | 700 | 380 | 110 | 180 | 50 | 4-∅17 | M42×2 | G3/4" |
All dimensions in mm. N = A + total stroke. L = N + boost stroke additional length. For custom configurations above 40T (up to 150T), contact engineering for detailed dimension sheets.
JRA vs JRAA: Which Mounting Orientation?
Both share the same pre-press boosting mechanism — identical force range, bore sizes, and two-stage cycle. The only difference is mounting direction. Choose based on how force must be applied in your machine.
JRA
Vertical StandardRod pushes downward. Mounts on top of a fixture or press plate. The classic configuration for top-down work.
| Mounting | Vertical (rod-down) |
| Force Range | 1–40 T (custom to 150T) |
| Bore Sizes | ∅63 / 80 / 100 / 125 / 160 |
| Stroke | 10–300 mm |
- Vertical staking & riveting
- Top-down press-fit assembly
- Marking & embossing from above
- Presses with vertical tooling
JRAA
Horizontal StandardRod pushes horizontally. Mounts on a base plate (foot) or vertical wall (flange). For side-load applications where vertical mounting is impractical.
| Mounting | Horizontal — Type A foot / Type B flange |
| Force Range | 1–40 T (custom to 150T) |
| Bore Sizes | ∅63 / 80 / 100 / 125 / 160 |
| Stroke | 10–300 mm |
- Horizontal extrusion & bending
- Inline assembly line stations
- Side-press & horizontal forming
- Fixtures where rod must push sideways
Internal mechanism, force output, and pneumatic circuit are identical — only the mounting orientation and body configuration differ. Need a custom orientation? Contact our engineering team.
Build Your Model Number
Configure your JRA and see the model code update in real time. The force output calculates automatically from your bore and air supply pressure.
Values are theoretical. Actual output may vary with seal friction, line losses, and hydraulic oil condition. For critical applications, apply a 1.5× safety factor.
Typical Applications
The JRA is the versatile choice for high-force pressing tasks that need fast approach and controlled final forming — across automotive, electronics, hardware, and appliance manufacturing.
Ready to Configure Your JRA?
Send us your required tonnage, stroke, and mounting orientation. Our engineering team will reply with a quotation and dimension sheet within 24 hours.