Airtac SCJ50 Standard Cylinder SCJ50X65-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X65-40S 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, 65mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke65 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X65-40S
The SCJ50X65-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 65 mm nominal stroke by up to 40 mm without swapping the unit. At 0.5 MPa it delivers 982 N push and 825 N pull, driven by a 20 mm piston rod and fed through PT1/4 ports.
A built-in magnet (denoted by the -S suffix) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for contactless position feedback. The 21 mm air cushion at each end decelerates the piston quietly, and the 194 mm body length (A dimension) keeps the assembly compact for a 50 mm bore adjustable-stroke cylinder.
Airtac SCJ50 Standard Cylinder SCJ50X65-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X65-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 65 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 SCJ50X65-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×65 | 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 SCJ50X65-40S Is Used
Commissioning & Setup
Dial in the exact 65 mm stroke end position with the 40 mm adjustment screw during machine bring-up, eliminating the need to shim or reposition the cylinder bracket.
Format Changeover
Quickly adjust the cylinder stroke for different product sizes on a packaging or labeling line, reducing downtime between batches without mechanical modifications.
Wear Compensation
Take up mechanical play or seal wear in a clamping or pressing station by advancing the stroke-end screw, maintaining consistent contact force over the cylinder's service life.
Is the Airtac SCJ50 Standard Cylinder SCJ50X65-40S the Right Cylinder?
Choose the SCJ50 when your application needs around 982 N of push force at standard plant air. If you need more power, stepping up to the 63 mm bore provides 1559 N push at the same pressure; for a lighter, more compact solution, the 40 mm bore delivers 628 N. This adjustable-stroke model is ideal when the exact stop position must be dialed in during commissioning or changed between product runs.
For a drop-in replacement, match the 50 mm bore, 65 mm nominal stroke, 40 mm adjust range, PT port thread, and the -S magnet option. If your motion is purely fixed and never needs end-point tuning, the standard SC fixed-stroke cylinder is a simpler, cost-effective alternative. This SCJ uses basic mounting; add FA, LB, or TC brackets if panel or trunnion mounting is required.
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 SCJ50X65-40S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N.
Only if you no longer need the adjustable stroke feature. The SCJ50X65-40S has a rear adjusting screw that shortens the stroke end by up to 40 mm. A direct replacement must be another SCJ cylinder with a 50 mm bore, 65 mm nominal stroke, 40 mm adjustment range, PT ports, and a built-in magnet.
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