Airtac SCJ50 Standard Cylinder SCJ50X450-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-40S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke450 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-40S
The SCJ50X450-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. A rear-cap adjusting screw lets you shorten the effective stroke by up to 40 mm without dismounting the cylinder or adding external hard stops, which is invaluable during commissioning, format changeovers, or when compensating for tooling wear. The 50 mm bore delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), while the 20 mm piston rod provides solid rigidity across the 450 mm nominal stroke.
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 non-contact position sensing. The cylinder uses a PT1/4 port, an M16x1.5 rod thread, and a 21 mm air cushion to decelerate the piston quietly at end of travel. The SCJ body length A is 194 mm plus stroke, making it slightly longer than a fixed-stroke SC of the same bore. Operating pressure spans 0.15–1.0 MPa with a speed range of 30–800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X450-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 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 SCJ50X450-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 SCJ50X450-40S Is Used
Commissioning & Setup Trials
The 40 mm rear adjust screw lets technicians dial in the exact retract stop position during machine bring-up without swapping cylinders or machining custom spacers, speeding up factory acceptance testing.
Product Format Changeover
On packaging or assembly lines running multiple product sizes, the adjustable stroke allows a single cylinder to be quickly reset for different box heights or component thicknesses, reducing changeover downtime.
Wear Compensation
In clamping or pressing fixtures, the stroke end can be incrementally advanced over the cylinder's service life to compensate for pad wear or material compression, maintaining consistent clamping force without mechanical shims.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-40S the Right Cylinder?
Choose the SCJ50X450-40S when you need a mid-range force actuator with field-adjustable stroke end. If 982 N push at 0.5 MPa is marginal, stepping up to a 63 mm bore (SCJ63) raises push force to 1559 N at the same pressure; if space or air consumption is a concern, the 40 mm bore (SCJ40) provides 628 N push. The 40 mm adjust range is ideal for applications where the exact stop position must be dialed in after installation. For a fixed, non-adjustable stroke, the standard SC series is a simpler, lower-cost alternative.
At 450 mm nominal stroke, side-load and rod buckling must be managed. Do not use the piston rod as a guide rail; fit an external linear guide or switch to a guided cylinder if the load applies lateral force. This SCJ is a direct dimensional replacement only for another AirTAC SCJ50 with the same nominal stroke, 40 mm adjust range, PT1/4 ports, basic mounting, and built-in magnet.
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 SCJ50X450-40S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the single 20 mm rod reducing the piston area on the retract side). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1963 N. Always apply a safety factor for real-world dynamic loads.
Only if you need the adjustable stroke feature and can accommodate the slightly longer body length. The SCJ50X450-40S has the same bore, nominal stroke, port size (PT1/4), and rod thread (M16x1.5) as an SC50X450, but the rear adjusting screw adds length. Mounting accessories from the SCJ subset (Basic, FA, LB, TC) are required; SC fixed-stroke mounts are not all interchangeable.
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