The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X135-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 135mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X135-50 is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm, so the effective stroke can be tuned anywhere from 85 mm to the full 135 mm without removing the cylinder from the machine. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a capable mid-range actuator for positioning and clamping tasks.
This tie-rod cylinder uses a 16 mm diameter piston rod and PT1/4 ports. Its adjustable air cushion decelerates the piston smoothly, and the body length A(SCJ) is 185 mm. The SCJ design is ideal for commissioning trials, format changeovers, or any application where the end-of-stroke position needs fine-tuning on the fly.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X135-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 135 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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.
Fine-tune the end-of-stroke position during machine commissioning. The 50 mm adjustment range lets technicians dial in the exact stopping point for a pusher or stop gate without fabricating new brackets.
Quickly adapt a diverter or reject station to different box or pallet sizes. The rear screw adjusts the stroke end in seconds, minimizing downtime between production runs.
In clamping or pressing fixtures, use the adjustable stroke to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force without replacing the cylinder.
Choose this 40 mm bore when the 628 N push force at 0.5 MPa fits your load. If you need more force, step up to the 50 mm bore (SCJ50 series, 982 N push at 0.5 MPa); for a lighter, more compact solution, the 32 mm bore (SCJ32, 402 N push) may suffice. The 50 mm adjustment range on this model is generous—if your application only needs a small end-stop tweak, a model with a shorter -{adj} code like SCJ40X135-20 can reduce cost and overall length.
This SCJ replaces any AirTAC SCJ40 adjustable-stroke cylinder with the same 135 mm nominal stroke, 50 mm adjustment range, PT ports, and basic mounting. If you need a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. For applications with high side loads at this 135 mm stroke, consider an external guide rail or a guided cylinder to protect the rod bearing from bending stress.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N. The push force is higher than the pull force because the single piston rod reduces the effective piston area on the return stroke.
A threaded adjusting screw in the rear end cap acts as an internal mechanical stop for the piston. By turning the screw, you can shorten the stroke end by up to 50 mm from the nominal 135 mm maximum. This adjusts only the stopping position, not the cylinder's speed or force, and allows for on-machine fine-tuning without disassembling the cylinder.
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