The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-30 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-30 is a double-acting, single-rod pneumatic cylinder from AirTAC, featuring a rear-cap adjusting screw that allows the effective stroke end to be fine-tuned within a 30 mm range without replacing the unit. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a robust actuator for mid-range automation tasks where commissioning adjustments or format changes are frequent.
This tie-rod cylinder has a body length (A dimension) of 185 mm and uses PT1/4 ports with an M12x1.25 rod thread. The adjustable air cushion decelerates the piston smoothly, and the design is rated for a maximum operating pressure of 1.0 MPa, where push force reaches 1130 N. The nominal stroke is 300 mm, well within the 1200 mm maximum standard stroke for this bore size.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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.
The 30 mm adjustment screw allows engineers to precisely dial in the stroke end position during initial machine setup without swapping cylinders or machining external hard stops, saving hours of commissioning time.
On packaging or sorting lines, the stroke can be quickly re-adjusted to handle different product sizes or box dimensions, enabling a fast format changeover between production runs.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for mechanical wear on tooling or contact surfaces, maintaining consistent process force and position.
For applications needing slightly less force, stepping down to a 32 mm bore (SCJ32) reduces push force to 402 N at 0.5 MPa. If higher force is required, the 50 mm bore (SCJ50) provides 982 N. When a fixed, non-adjustable stroke is sufficient, the standard SC series offers a simpler, more cost-effective solution. For applications with significant side loads on this 300 mm stroke, an external guide rod or a guided cylinder is recommended to prevent rod bending and ensure long seal life.
This model is a direct replacement for another AirTAC SCJ40X300-30 with PT ports and basic mounting. To upgrade, ensure any replacement matches the bore, 300 mm nominal stroke, and the 30 mm adjustment range. If your application requires position sensing, the -S magnet option allows for easy integration of CMSG or DMSG sensors.
Adjustable-stroke checklist
A screw mechanism in the rear cap limits how far the piston can retract. Turning the screw shortens the stroke end by up to 30 mm from the 300 mm nominal maximum, giving you a field-adjustable stroke range of 270-300 mm. It does not alter the cylinder's output force.
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The pull force is lower due to the area of the 16 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1130 N.
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