Airtac SCJ50 Standard Cylinder SCJ50X30-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X30-20S 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, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke30 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X30-20S
The SCJ50X30-20S is a 50 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw, giving you up to 20 mm of field-adjustable stroke-end reduction without changing the cylinder. Its 20 mm rod and PT1/4 ports deliver 982 N of push force at 0.5 MPa, making it a compact workhorse for tasks that need fine mechanical tuning after installation.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The standard TPU seal and PT threads keep it compatible with common filtered-air systems, and the 21 mm air cushion at each end protects the piston from hard stops.
Airtac SCJ50 Standard Cylinder SCJ50X30-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X30-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 30 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 SCJ50X30-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SCJ50X30-20S Is Used
Commissioning Fine-Tuning
Dial in the exact stroke end position on a new assembly line without swapping shims or hard stops, using the 20 mm adjustment range to compensate for build tolerances.
Format Changeover
Quickly adjust a stop position on a packaging machine when switching between product sizes, reducing downtime with a simple screw adjustment instead of a mechanical change.
Sensor-Ready Positioning
The integrated magnet allows direct mounting of CMSG/DMSG sensors for clean, non-contact end-of-stroke feedback in automated pick-and-place systems.
Is the Airtac SCJ50 Standard Cylinder SCJ50X30-20S the Right Cylinder?
Choose the SCJ50X30-20S when you need a 50 mm bore with a short 30 mm nominal stroke that can be trimmed back by up to 20 mm during commissioning. If you need more push force, stepping up to the 63 mm bore provides 1559 N at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC series offers a simpler, more cost-effective solution. The sensor-ready magnet makes this model a direct replacement for any AirTAC SCJ50 with a -S option, matching bore, stroke, adjust range, and PT ports.
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 SCJ50X30-20S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The single-rod design means the push force is greater due to the full piston area, while the pull side is reduced by the 20 mm rod cross-section.
The rear adjusting screw sets the stroke end position within a 20 mm range, shortening the 30 mm nominal stroke. It does not adjust force or speed. The air cushion decelerates the piston, but the cylinder will not hold its position if air pressure is lost; an external lock or pilot-operated check valve is required for load holding.
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