Airtac SCJ50 Standard Cylinder SCJ50X70-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke70 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-40S
The SCJ50X70-40S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 70 mm stroke, delivering 982 N of push force at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides up to 40 mm of field-adjustable stroke-end reduction, allowing machine builders to fine-tune the piston stopping position without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The 20 mm diameter piston rod and PT1/4 ports handle standard pneumatic flows, while the integrated air cushion, with a 21 mm cushion length, decelerates the piston quietly at the end of its travel.
Airtac SCJ50 Standard Cylinder SCJ50X70-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 40 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 SCJ50X70-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X70-40S Is Used
Commissioning & Setup
Engineers can fine-tune the end-stop position during initial machine setup without machining custom spacers, significantly reducing commissioning time for packaging or assembly stations.
Format Changeovers
Quickly adjust the stroke end to accommodate different product sizes on a conveyor line, such as changing the push distance for boxes of varying widths in a case-packing machine.
Wear Compensation
The 40 mm adjustment range can be used to take up mechanical wear in tooling or grippers over time, maintaining precise placement without immediate component replacement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-40S the Right Cylinder?
Choose the SCJ50X70-40S when you need a mid-range force cylinder whose stroke end can be dialed in precisely on the machine. With 982 N of push force at 0.5 MPa, it sits between the smaller 40 mm bore (628 N) and the larger 63 mm bore (1559 N). If your application requires a fixed, non-adjustable stroke, the standard SC series is a more economical alternative. This cylinder is a direct replacement for another AirTAC SCJ50 cylinder with a 70 mm nominal stroke, a 40 mm adjustment range, PT ports, and a magnetic piston.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X70-40S FAQ
A rear-cap adjusting screw allows you to shorten the stroke end by up to 40 mm from the nominal 70 mm maximum. This sets the piston's final stopping position, but it does not change the cylinder's push force, which remains 982 N at 0.5 MPa.
Yes, the -S suffix indicates a built-in magnet in the piston. This allows AirTAC CMSG, DMSG, or EMSG sensors to be mounted directly on the cylinder's tie-rods to detect piston position without any additional brackets.
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