The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-30S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X350-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 628 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction, making it ideal for commissioning fine-tuning and format changeovers without swapping the cylinder.
This model features a 16 mm piston rod and a built-in magnet (suffix -S), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors for precise end-of-stroke detection. The body length A(SCJ) is 185 mm, and the cylinder operates with filtered air from 0.15 to 1.0 MPa across a temperature range of -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 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. |
| ×350 | 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 adjustable stroke allows technicians to precisely dial in the actuator's end position during initial machine setup, eliminating the need for trial-and-error with fixed hard stops.
Ideal for packaging lines where the push distance for different box sizes must be changed quickly. Operators adjust the rear screw to match the new format without disassembling the machine.
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force and precision.
Select the SCJ40 bore when your application requires around 628 N of push force at standard plant pressure. If you need more force, stepping up to the SCJ50 bore provides 982 N of push force at the same 0.5 MPa. For applications that do not require stroke-end adjustment, the fixed-stroke SC40 series offers a more compact and cost-effective alternative.
For this 350 mm stroke, be mindful of side loading which can cause rod bending or premature seal wear. If the load is not guided externally, consider pairing the cylinder with an external guide rail or switching to a guided cylinder series. The exact replacement match is an AirTAC SCJ40X350-30S: a 40 mm bore, 350 mm nominal stroke, 30 mm adjustable range, PT port thread, basic mounting, and a built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The push force is higher because pressure acts on the full bore area, while pull force is reduced by the 16 mm piston rod area.
A screw on the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw shortens the stroke by up to 30 mm from the nominal 350 mm maximum. It adjusts only the stroke end position, not the cylinder's force or speed.
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