Airtac SCJ50 Standard Cylinder SCJ50X40-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X40-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke40 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X40-30S
The SCJ50X40-30S is a 50 mm bore double-acting single-rod cylinder that puts field-adjustable stroke control directly on the machine. Its rear-cap screw lets you shorten the stroke end by up to 30 mm without swapping the cylinder, making it ideal for commissioning tweaks or format changeovers. With a 20 mm rod and PT1/4 ports, it delivers 982 N of push force at a standard 0.5 MPa supply.
A built-in magnet (the -S suffix) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly over the final 21 mm of travel, and the TPU seal keeps it running from -20 to +70 °C. This genuine AirTAC unit is a drop-in solution when you need to fine-tune a stop position without adding external hard stops.
Airtac SCJ50 Standard Cylinder SCJ50X40-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X40-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 30 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 SCJ50X40-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×40 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X40-30S Is Used
Commissioning & Setup
Fine-tune the stroke end by up to 30 mm during machine commissioning without removing the cylinder or adding mechanical stops, speeding up the debug phase.
Format Changeovers
Adjust the stop position for different product sizes on packaging or assembly lines. The magnetic piston allows sensors to confirm the new position every cycle.
Wear Take-Up
Compensate for tooling or gripper wear over time by slightly extending the effective stroke with the rear screw, maintaining consistent part contact.
Is the Airtac SCJ50 Standard Cylinder SCJ50X40-30S the Right Cylinder?
Choose the SCJ50X40-30S when 982 N of push at 0.5 MPa covers your load and you need to dial in the stroke end during setup. If your force requirement is lower, stepping down to a 40 mm bore (628 N push) saves space and air; for heavier work, the 63 mm bore provides 1559 N. The 30 mm adjustment range is factory-set to the nominal 40 mm stroke, so you can reduce the working stroke down to 10 mm if needed.
This model is a direct replacement for another AirTAC SCJ50X40-30S with a PT port, basic mount, and magnet. If your application needs a fixed, repeatable stroke with no field adjustment, the standard SC series is a simpler choice. For pivoting loads, the TC centre trunnion mount (F-SC50TC) can be added.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X40-30S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. Because it is a single-rod cylinder, the push force is higher than the pull force due to the rod area on the return side.
A screw in the rear cap limits how far the piston retracts, shortening the stroke end by up to 30 mm from the nominal 40 mm. It only adjusts the end position, not the speed or force. The cylinder must be depressurized before adjustment.
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