The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-10 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, while the 16 mm piston rod provides 528 N of pull force. The rear-cap adjusting screw allows you to shorten the nominal 300 mm stroke by up to 10 mm without removing the cylinder, making it ideal for commissioning and fine-tuning end positions.
This tie-rod cylinder uses a PT1/4 port and an M12x1.25 rod thread, with a 21 mm air cushion at each end for smooth deceleration. The body length A(SCJ) is 185 mm, and it operates reliably between -20 and +70 °C with filtered air from 0.15 to 1.0 MPa. The standard TPU seal and PT thread suit general industrial environments.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 10 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. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -10 | 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 10 mm adjusting screw lets technicians fine-tune the retract end position during initial machine setup without swapping out hard stops or cylinder bodies.
Adjust the product stop position on a conveyor for different box sizes. The 300 mm stroke covers a long travel, while the screw dials in the final placement.
In clamping or pressing fixtures, use the screw to take up mechanical wear on tooling over time, maintaining consistent clamp force without reprogramming the machine.
Choose the SCJ40X300-10 when you need to dial in a precise stroke end on a 300 mm nominal stroke. If the 628 N push force at 0.5 MPa is marginal, stepping up to a 50 mm bore provides 982 N. For applications that do not require stroke adjustment, the fixed-stroke SC40X300 is a simpler, cost-effective alternative. This model is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 300 mm nominal stroke, 10 mm adjust range, PT1/4 ports, and basic mounting. For strokes of 300 mm or more, consider an external guide or a guided cylinder if the rod will experience significant side loads, as this prevents rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf. The push force is always greater than the pull force because it is a single-rod cylinder.
Yes, the SCJ40X300-10 can replace an SC40X300 if you need the 10 mm stroke adjustment feature. The mounting footprint and port locations are the same. Ensure the replacement matches the bore, nominal stroke, port thread (PT), and mounting style. If you do not need the adjustability, the standard SC40X300 is a more economical choice.
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