Airtac SCJ50 Standard Cylinder SCJ50X250-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-40 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-40
The SCJ50X250-40 delivers a nominal 250 mm stroke with a 40 mm rear-cap adjusting screw for fine-tuning the stroke end position without cylinder removal. This single-rod, double-acting cylinder provides 982 N of push force and 825 N of pull force at 0.5 MPa, making it a workhorse for mid-range pneumatic tasks requiring on-machine adjustability.
With a 20 mm piston rod, M16x1.5 rod thread, and PT1/4 ports, the SCJ50X250-40 fits standard AirTAC SCJ mountings. The 21 mm air cushion at each end decelerates the piston smoothly, and the body length A is 194 mm. Its adjustable stroke is ideal for commissioning trials, format changeovers, or compensating for wear without swapping the entire actuator.
Airtac SCJ50 Standard Cylinder SCJ50X250-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 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 SCJ50X250-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SCJ50X250-40 Is Used
Commissioning Fine-Tuning
During machine setup, the 40 mm adjusting screw lets technicians precisely dial in the stroke end position to align with fixtures, eliminating the need to shim or reposition the cylinder body.
Wear Compensation on Stops
On a packaging line where a pusher arm contacts a mechanical stop, the adjustable stroke can be extended slightly over time to compensate for wear on the contact surface, maintaining consistent product placement.
Format Changeover
When a machine processes different product sizes, the stroke can be quickly adjusted to match the new dimensions. The 40 mm range allows a single SCJ50X250-40 to handle multiple formats without mechanical modifications.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-40 the Right Cylinder?
Choose the SCJ50X250-40 when you need to dial in a precise end stop within a 40 mm window on a 250 mm nominal stroke. If your force requirement is lower, the 32 mm bore SCJ offers 402 N push at 0.5 MPa; for more power, the 63 mm bore steps up to 1559 N. For applications where the stroke never needs field adjustment, the fixed-stroke SC50X250 is a simpler, cost-effective alternative.
At 250 mm stroke, ensure the load is guided to prevent excessive side forces on the 20 mm rod. For a drop-in replacement, match the SCJ50X250-40's bore, 250 mm nominal stroke, 40 mm adjust range, PT1/4 ports, and basic mounting. The built-in magnet option (-S) is not present on this model, so position sensing requires external brackets if needed.
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 SCJ50X250-40 FAQ
At the standard 0.5 MPa operating pressure, this double-acting cylinder provides 982 N of push force and 825 N of pull force. The push force is higher because the full 50 mm bore area is pressurized, while the pull side has the 20 mm rod reducing the effective piston area.
A screw in the rear cap acts as an internal, adjustable end stop for the piston. Turning the screw changes the retracted stroke end position within a 40 mm range, effectively shortening the stroke from the nominal 250 mm maximum. It does not alter the cylinder's force or speed, only the stopping point.
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