Airtac SCJ50 Standard Cylinder SCJ50X90-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X90-20S 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, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke90 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X90-20S
The SCJ50X90-20S is a 50 mm bore double-acting single-rod cylinder that delivers 982 N of push force at 0.5 MPa (pull is 825 N). Its defining feature is the rear-cap adjusting screw, which lets you shorten the stroke end by up to 20 mm without removing the cylinder—ideal for commissioning fine-tuning or format changeovers on packaging and assembly machines.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The 20 mm rod has an M16x1.5 thread, PT1/4 ports, and a 21 mm air cushion that decelerates the piston near stroke end. Body length A(SCJ) is 194 mm.
Airtac SCJ50 Standard Cylinder SCJ50X90-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X90-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 90 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 SCJ50X90-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×90 | 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 SCJ50X90-20S Is Used
Commissioning Fine-Tuning
During machine bring-up, the 20 mm adjusting screw lets technicians dial in the exact stroke end position without swapping cylinders or machining external stops, speeding up debug and validation.
Format Changeover
On cartoners and case packers that run multiple box sizes, operators can quickly reset the cylinder stroke to match a new product format, reducing changeover downtime.
Sensor-Ready Positioning
The built-in magnet works with CMSG/DMSG sensors to confirm the piston has reached the adjusted end position, giving the PLC a reliable signal for the next machine sequence.
Is the Airtac SCJ50 Standard Cylinder SCJ50X90-20S the Right Cylinder?
Step up to the 63 mm bore if you need more force—the SCJ63 delivers 1559 N push at 0.5 MPa. For applications that don't require field-adjustable stroke, the fixed-stroke SC50 offers the same bore and mounting footprint. If your machine needs a direct drop-in replacement, match the 50 mm bore, 90 mm nominal stroke, -20 adjust range, PT ports, and the -S magnet; the basic mount (no bracket) keeps the cylinder interchangeable with the same AirTAC SCJ code.
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 SCJ50X90-20S FAQ
At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the rod occupies part of the piston area on the return stroke.
Yes, provided the mounting style, port thread, and magnet option match. The SCJ body is slightly longer to house the adjusting screw, so check the 194 mm body length A(SCJ) against your available space. The adjusting screw lets you fine-tune the stroke end by up to 20 mm without changing the cylinder.
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