The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-40 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-40 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides a 40 mm adjustable range, letting you shorten the 75 mm nominal stroke without swapping the cylinder or adding external hard stops. The 16 mm diameter piston rod and PT1/4 port deliver a push force of 628 N at 0.5 MPa, scaling to 1130 N at the maximum operating pressure of 0.9 MPa.
Built on the proven AirTAC SC tie-rod platform, this SCJ variant adds field-adjustable commissioning flexibility for format changes and wear take-up. The cylinder body length A(SCJ) is 185 mm, and it includes an adjustable air cushion to decelerate the piston smoothly. Standard TPU seals and PT threads are fitted, with an operating temperature range of -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
Quickly dial in a new end position when a packaging machine switches between different box sizes, eliminating manual stop adjustments.
Fine-tune the actuator stroke on a new assembly fixture during runoff, then lock the 40 mm setting for consistent production.
Take up mechanical play in a clamping or pressing operation over time by advancing the stroke end with the rear screw.
Choose the SCJ40X75-40 when your application needs a 40 mm bore with up to 40 mm of on-machine stroke adjustment. If you require more force, step up to the SCJ50 series, which provides 982 N of push force at 0.5 MPa from its 50 mm bore. For applications that do not need stroke adjustability, the fixed-stroke SC40 series offers the same bore and mounting pattern in a simpler, more compact package. As a direct replacement, match this unit with another AirTAC SCJ adjustable-stroke cylinder of 40 mm bore, 75 mm nominal stroke, 40 mm adjust range, and PT port thread. Mounting accessories from the SCJ subset—such as FA front flange or LB foot mounts—attach directly.
Adjustable-stroke checklist
At 0.5 MPa, it generates 628 N of push force and 528 N of pull force due to the single-rod design. The maximum push force at 0.9 MPa operating pressure is 1130 N.
Yes, the SCJ40 shares the same bore, port size, and mounting footprint as the SC40. The body is slightly longer to house the adjusting screw, but it drops into the same basic, FA, LB, or TC mounting brackets.
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