The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-40S 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 SCJ40X50-40S is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw provides up to 40 mm of stroke-end reduction, letting you fine-tune the piston stop position without swapping the cylinder. It delivers 628 N of push force at 0.5 MPa and uses a 16 mm diameter piston rod with an M12x1.25 male thread.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke sensing. The body length A(SCJ) is 185 mm, and the port is PT1/4. It operates on 40 µm filtered air from 0.15 to 1.0 MPa, with an adjustable air cushion to decelerate the piston smoothly.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-40S |
|---|---|
| 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.
Fine-tune the actuator end-stop on a new assembly line. The 40 mm adjustment screw lets technicians dial in the exact stroke for a pick-and-place gripper without needing to swap cylinders or machine custom stops.
On a clamping or pressing fixture, use the rear screw to take up mechanical wear over time. A small turn restores the original clamp position, maintaining consistent force application without reprogramming the machine.
Adjust the stroke end for a product stopper on a conveyor line. When switching between different box sizes, the operator can quickly shorten the stroke by up to 40 mm, eliminating the need for multiple fixed-stroke cylinders.
Choose the SCJ40X50-40S when you need to dial in a precise stroke end on a 40 mm bore platform, especially during commissioning or for format changes. If you need more force, stepping up to the SCJ50 series gives you 982 N of push at 0.5 MPa. For applications that don't require stroke adjustment, the fixed-stroke SC40 series is a simpler, cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ40 adjustable-stroke unit with a 50 mm nominal stroke, a 40 mm adjust range, PT1/4 ports, basic mounting, and a magnet. If your application involves a side load, consider adding an external guide rail or switching to a guided cylinder, as the rod bearing is not designed to support high transverse forces.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. Because it's a single-rod cylinder, the push force is higher than the pull force. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
Yes, if you need stroke-end adjustability. The SCJ40X50-40S has the same 40 mm bore, 50 mm nominal stroke, and PT1/4 ports as an SC40X50. The body is slightly longer to house the adjusting screw. Ensure the 40 mm adjustment range is sufficient for your stroke reduction needs.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.