The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-30S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, providing a 30 mm rear-end adjustment range on its 80 mm nominal stroke. This 40 mm bore model delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks requiring fine positional tuning without swapping the cylinder.
A built-in magnet (S) allows direct mounting of CMSG/DMSG/EMSG sensors for electronic end-of-stroke detection, and the 16 mm diameter piston rod with M12x1.25 thread provides robust connection. With a body length of 185 mm and a 21 mm air cushion, it offers smooth deceleration in a compact tie-rod design.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 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. |
| ×80 | 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.
Fine-tune the end-stop position on packaging machinery during initial setup without needing to shim or change hard stops, dramatically reducing commissioning time.
Quickly adjust a pusher or diverter stroke for different box sizes on a conveyor line, enabling a single machine to handle multiple product formats with minimal downtime.
In clamping or pressing fixtures, the adjusting screw can be used to take up mechanical wear on contact surfaces over time, maintaining consistent clamping force without reprogramming.
Choose the SCJ40X80-30S when you need to precisely dial in the stroke end position during commissioning or for format changes. If more force is required, step up to the 50 mm bore SCJ50 series, which provides 982 N of push force at the same pressure. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler, more cost-effective alternative.
As a direct replacement, match this model with another AirTAC SCJ adjustable-stroke cylinder of 40 mm bore, 80 mm nominal stroke, and a 30 mm adjustment range, ensuring the PT port thread and -S magnet option are also matched. The basic mounting style requires no additional brackets.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. The maximum theoretical force at 1.0 MPa is 128 kgf.
A rear-cap adjusting screw limits the piston's stroke end by up to 30 mm from its 80 mm maximum. You pick an SCJ when the application requires field-tunable stroke length for setup, changeover, or wear take-up. Choose a fixed-stroke SC if the stroke length is permanently fixed, as it is a simpler and more economical solution.
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