The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X500-50 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X500-50 is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides up to 50 mm of stroke-length reduction, letting you dial in the exact end position without changing the cylinder or adding external hard stops. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a capable mid-bore actuator for tasks that need precise mechanical setup.
Body length A for the SCJ40 is 185 mm, and the 16 mm diameter rod runs in an adjustable air cushion that decelerates the piston smoothly over the final 21 mm of travel. The standard PT1/4 port and M12x1.25 rod thread keep plumbing and tooling straightforward. This model is built to the standard TPU seal specification, rated for -20 to +70 °C with filtered air.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X500-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 500 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. |
| ×500 | 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.
The 50 mm adjustment range lets commissioning engineers fine-tune the stroke end position on a new machine in seconds, without cutting brackets or re-machining stops.
On packaging or assembly lines, the screw adjuster enables operators to quickly set a new product stop position when switching between different box or pallet sizes.
In clamping or pressing fixtures, the adjustable stroke can take up mechanical wear on tooling or workpieces over time, maintaining consistent clamp force without replacing the actuator.
This 40 mm bore cylinder suits applications where the force of a smaller 32 mm unit (402 N push) is marginal but a 50 mm (982 N push) is oversized and slower. For a fixed-stroke version without the rear screw, choose the SC40X500. If the rod needs to extend from both ends, the SCD40 twin-rod type is the alternative. The SCJ40X500-50 is a direct replacement for another AirTAC SCJ40 with a 500 mm nominal stroke, 50 mm adjust range, PT ports, and basic mounting.
At a 500 mm stroke, the slender 16 mm rod is susceptible to side-load buckling. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to protect the rod and bearing from bending moments.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder produces 628 N of push force and 528 N of pull force. At the maximum 0.9 MPa pressure, the push force increases to 1130 N.
A rear-cap screw mechanically limits how far the piston retracts, shortening the effective stroke by up to the specified adjust range (50 mm in this model). Choose SCJ when you need to fine-tune the stroke end position on the machine for setup, format changes, or wear take-up. Choose a fixed-stroke SC when the stroke is permanently fixed and you want a simpler, slightly shorter cylinder.
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