The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X135-30S 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, 135mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X135-30S is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides a 30 mm range to fine-tune the extended position without changing the cylinder, delivering 628 N of push force at 0.5 MPa and up to 1130 N at the maximum 0.9 MPa operating pressure.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed or solid-state sensors to be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. With a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion, it is a genuine AirTAC unit built for commissioning flexibility and format changeovers.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X135-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 135 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. |
| ×135 | 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 rear adjuster lets technicians quickly dial in the exact stroke end position during machine commissioning, eliminating the need to fabricate custom external stops for a 135 mm nominal stroke.
On packaging or assembly lines, operators can adjust the stroke end to accommodate different product sizes or box formats without stopping production to replace the cylinder, saving significant changeover time.
In clamping or pressing applications, the adjustable stroke can be periodically tweaked to compensate for tooling or pad wear, maintaining consistent contact force and part quality over the cylinder's service life.
Choose the SCJ40X135-30S when you need to dial in the stroke end position on the machine without swapping cylinders. If 628 N of push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore SCJ provides 982 N; if space is tight, the 32 mm bore offers 402 N. For applications where the stroke never needs field adjustment, a fixed-stroke SC40 cylinder is a simpler, lower-cost alternative.
This adjustable-stroke cylinder is a direct replacement for another AirTAC SCJ40 of the same 135 mm nominal stroke and 30 mm adjust range, with PT ports, basic mounting, and a magnet. Since the nominal stroke is under 300 mm, side-load and rod bending risks are minimal, but always align the load with the rod axis.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder produces 628 N of push force and 528 N of pull force. The push force increases to 1130 N at the maximum operating pressure of 0.9 MPa. Because it is a single-rod cylinder, the push force is always greater than the pull force.
No. Like all standard double-acting pneumatic cylinders, the SCJ40X135-30S will not hold its position if air pressure is lost or the directional valve is centered. The piston can drift or drop. If load holding is required without live pressure, you must add an external mechanical lock, a rod brake, or a pilot-operated check valve.
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