The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-40S 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. Ø50mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ50X300-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. Its rear-cap adjusting screw provides a 40 mm adjustable range, letting you dial in the exact 300 mm nominal stroke end position without dismounting the cylinder. With a 20 mm diameter rod and a push force of 982 N at 0.5 MPa, it handles robust mid-range positioning tasks.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG solid-state or reed sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly. At its maximum operating pressure of 0.9 MPa, the push force reaches 1767 N, giving you a substantial power reserve for clamping or pressing applications.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 end position of a material stop or pusher during machine commissioning. The 40 mm screw adjustment allows operators to quickly dial in the perfect stroke without swapping out hard stops.
Adjust the stroke of a diverter gate on a conveyor line for different package sizes. The field-adjustable screw makes format changeovers fast and tool-free, minimizing downtime.
Compensate for mechanical wear in a clamping fixture over time. The adjustable stroke lets you incrementally advance the end position to maintain consistent clamping force as contact surfaces wear.
Choose the SCJ50X300-40S when you need a 50 mm bore cylinder with a field-adjustable stroke end to accommodate commissioning trials or format changes. If you require more force, stepping up to the 63 mm bore provides 1559 N of push force at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This SCJ cylinder is a direct replacement for another AirTAC SCJ50X300-40S with a PT port and basic mounting. For strokes of 300 mm or more, be mindful of side loads on the 20 mm rod; an external guide rail or a guided cylinder assembly is recommended to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single 20 mm rod, providing 825 N at 0.5 MPa. These values are identical to the fixed-stroke SC50 cylinder.
A rear-cap screw mechanically limits the piston's stroke end within a 40 mm range, shortening the nominal 300 mm stroke. This is a position adjustment, not a locking device. The cylinder will not hold its position if air pressure is lost; an external mechanical lock or pilot-operated check valve is required for load holding.
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.