The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-40STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-40STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, providing a nominal 50 mm maximum stroke that can be shortened by up to 40 mm via the rear-cap adjusting screw. This 40 mm bore unit delivers a push force of 628 N at 0.5 MPa, using a 16 mm diameter piston rod and PT1/4 ports, making it a precise choice for applications requiring fine end-position tuning during commissioning or changeovers.
Equipped with a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount with the TCM1 bracket (order code F-SC40TC), this model is configured for pivoting applications. The standard TPU seal and PT threads ensure reliable operation within a -20 to +70 °C temperature range, with an adjustable air cushion for smooth deceleration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm adjustment range allows technicians to precisely dial in the stroke end position during initial machine setup and fine-tuning, eliminating the need for custom-length cylinders or hard stops.
On packaging or sorting lines, the adjustable stroke enables quick reconfiguration for different product sizes by simply turning the rear screw, minimizing downtime between production runs.
In clamping or pressing operations, the stroke can be incrementally adjusted to compensate for tooling or pad wear over time, maintaining consistent clamping force and position without replacing parts.
Choose this 40 mm bore SCJ when you need a mid-range force of 628 N push at 0.5 MPa and the ability to fine-tune the stroke end on the machine. If your application requires more force, step up to the 50 mm bore (982 N push); for a lighter, more compact solution, the 32 mm bore (402 N push) may suffice. This model is ideal when the stroke needs frequent, tool-free adjustment without swapping the cylinder.
For a direct replacement, match an AirTAC SCJ with a 40 mm bore, 50 mm nominal stroke, and a 40 mm adjustment range, ensuring the PT port thread and centre trunnion (TC) mounting with magnet (-S) are specified. If your application does not require stroke adjustability, a fixed-stroke SC cylinder is a simpler, more cost-effective alternative. For high side-load moments, consider an external guide rail or a guided cylinder.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
A rear-cap adjusting screw shortens the stroke end by up to 40 mm from the 50 mm nominal maximum. It is a direct functional replacement for an SC fixed-stroke cylinder of the same bore and mounting, but adds field-adjustability. You must match the bore, nominal stroke, adjust range, port thread (PT), and mounting type (TC) for a compatible swap.
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