The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-40S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X275-40S is a double-acting, single-rod pneumatic cylinder with a 40mm bore and a nominal stroke of 275mm, featuring a rear-cap adjusting screw that provides a 40mm field-adjustable stroke range. This allows precise end-position tuning without cylinder replacement. With a push force of 628 N at 0.5 MPa and a pull force of 528 N, it uses a 16mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for reliable, non-contact position sensing. The standard TPU seal ensures smooth operation within a -20 to +70°C temperature range, making it a versatile choice for commissioning and format changeovers.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 by up to 40mm during initial machine setup and trial runs, eliminating the need for physical shims or hard stops.
Quickly adjust the stroke end for different product sizes on packaging or sorting lines, reducing downtime between batch runs with a simple screw adjustment.
Compensate for mechanical wear in tooling or grippers over time by incrementally adjusting the cylinder's stroke end, maintaining consistent machine performance.
Select the SCJ40X275-40S when you need to fine-tune the stroke end position by up to 40mm on a machine. For higher force requirements, step up to the SCJ50 bore, which delivers 982 N of push force at 0.5 MPa. If your application requires a fixed, non-adjustable stroke, the standard SC series is a more cost-effective alternative. For direct replacement, match the 40mm bore, 275mm nominal stroke, 40mm adjust range, PT port thread, and built-in magnet. As this is a 275mm stroke, ensure the rod is adequately supported if significant side loads are present, or consider an external guide rail to prevent rod bending.
Adjustable-stroke checklist
At an operating pressure of 0.5 MPa, this 40mm bore cylinder provides a push force of 628 N and a pull force of 528 N. The maximum push force at 0.9 MPa is 1130 N.
A screw mechanism in the rear cap allows you to shorten the stroke end position by up to 40mm from the nominal 275mm maximum. It is a mechanical end-stop adjustment and does not change the cylinder's force or speed.
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