Airtac SCJ50 Standard Cylinder SCJ50X150-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X150-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke150 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X150-20
The SCJ50X150-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a capable mid-range actuator. The PT1/4 port and M16x1.5 rod thread integrate easily into standard pneumatic circuits.
This tie-rod cylinder features an adjustable air cushion (21 mm) for smooth deceleration and a body length A of 194 mm. The stroke-end screw allows operators to dial in the exact end position during commissioning or changeovers, without adding external hard stops. The standard TPU seals and PT threads suit general industrial environments operating between -20 and +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X150-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X150-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X150-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×150 | Nominal (maximum) stroke length in mm. |
| -20 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X150-20 Is Used
Commissioning & Setup
Technicians can precisely dial in the cylinder's end stop during initial machine setup, accommodating minor assembly variations without fabricating custom shims or brackets.
Product Changeover
On packaging lines, the 20 mm adjustment range allows operators to quickly reset a pusher or gate stroke for a new box size, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced over time to compensate for pad wear or material compression, maintaining consistent clamp force without reprogramming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X150-20 the Right Cylinder?
Choose the SCJ50X150-20 when you need to fine-tune the stroke end position on a machine without replacing the cylinder. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore provides 1559 N. For applications where the stroke length is fixed and never needs field adjustment, the standard SC series offers a more cost-effective solution. A direct replacement must match the 50 mm bore, 150 mm nominal stroke, 20 mm adjustment range, PT ports, and basic mounting. For strokes of 150 mm, side-loading is generally manageable, but an external guide rail is recommended if the rod experiences significant radial force.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X150-20 FAQ
At 0.5 MPa, the cylinder provides 982 N of push force and 825 N of pull force. The push force is greater because the rod reduces the effective piston area on the return stroke. The maximum operating push force at 0.9 MPa is 1767 N.
The rear adjusting screw limits the piston's forward travel by up to 20 mm, setting a new mechanical end stop. It does not lock or hold the piston mid-stroke. If the load must be held without air pressure, you need an external rod lock or a pilot-operated check valve.
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