Airtac SCJ40 Standard Cylinder SCJ40X250-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-30 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. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-30
The SCJ40X250-30 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the retract position by up to 30 mm via the rear-cap adjusting screw. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, placing it in a practical force class for moderate clamping, pressing, and positioning tasks. The PT1/4 port and M12x1.25 rod thread keep integration straightforward in compact machine layouts.
Because the stroke is adjustable, you can dial in the exact stopping point during commissioning or changeover without machining external hard stops. The cylinder uses a 21 mm air cushion to decelerate the piston quietly, and its body length A is 185 mm—slightly longer than the fixed-stroke SC version to house the adjusting mechanism. This genuine AirTAC unit is built for filtered-air service from 0.15 to 1.0 MPa and runs reliably from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X250-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X250-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SCJ40 Standard Cylinder SCJ40X250-30 Is Used
Commissioning & Setup
The 30 mm rear adjuster lets technicians fine-tune the retract end position on a new assembly line without fabricating custom stops, speeding up the debug phase for a 250 mm stroke actuator.
Product Changeover
When a packaging line switches between box sizes, the SCJ40X250-30 can be quickly dialled to a new stroke end, eliminating mechanical stop swaps and reducing downtime between batches.
Wear Compensation
In repetitive pressing or clamping fixtures, the adjustable screw can be advanced over time to take up pad wear, maintaining consistent contact force without replacing the cylinder or shimming the mount.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-30 the Right Cylinder?
Choose the SCJ40X250-30 when you need to tweak the stroke end on the fly—ideal for format changes or wear take-up on a 250 mm nominal stroke. If your load demands more push force, step up to the 50 mm bore SCJ50 series, which provides 982 N at the same 0.5 MPa; for a lighter, more compact solution the 32 mm bore offers 402 N. The adjustable-stroke SCJ is the right pick over a fixed-stroke SC only when you genuinely need the rear screw; otherwise the simpler SC saves cost and length. For a drop-in replacement, match a 40 mm bore SCJ with a 250 mm nominal stroke and 30 mm adjust range, PT thread, and the same basic mounting—no flange or clevis options exist on this series. At 250 mm stroke, rod bending is not a primary concern for most guided loads, but if the rod sees significant side force, add an external linear guide.
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 SCJ40 Standard Cylinder SCJ40X250-30 FAQ
At 0.5 MPa, the 40 mm bore generates 628 N of push force and 528 N of pull force (the difference is due to the 16 mm rod area on the retract side). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N.
Yes, if you need the adjustable stroke feature. The SCJ shares the same bore, rod, port, and mounting footprint as the SC series but adds the rear adjusting screw, making the body slightly longer. Ensure the 30 mm adjust range suits your stroke-end variation requirement.
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