The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-30STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-30STC is a double-acting single-rod pneumatic cylinder that lets you fine-tune the stroke end by up to 30 mm using the rear adjusting screw, without removing the cylinder from the machine. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a practical actuator for light positioning and clamping tasks where the exact stop point needs to be dialled in during commissioning.
This model includes a built-in magnet (-S) for mounting CMSG/DMSG sensors directly on the tie-rod barrel, and ships with a centre trunnion (TC) bracket set (F-SC40TC) for pivoting applications. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at the end of its 75 mm nominal stroke.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 adjust the end stop for different product sizes on a packaging line without swapping out the cylinder, reducing downtime during batch changes.
Compensate for tooling or gripper pad wear over time by advancing the stroke end with the rear screw, maintaining consistent contact pressure.
Fine-tune the actuator stroke on a new assembly fixture to find the optimal push position before locking the screw in place.
Choose the SCJ40 when you need a compact adjustable stroke in the 40 mm bore class. If you require more force, step up to the 50 mm bore SCJ50 which provides 982 N of push at 0.5 MPa. For applications that do not need field adjustability, the fixed-stroke SC40 is a simpler, lower-cost alternative. This SCJ40X75-30STC is a direct replacement for any AirTAC SCJ40 with a 75 mm nominal stroke, 30 mm adjust range, PT ports, centre trunnion mounting, and a magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Yes, if you need the ability to adjust the stroke end. The SCJ40 shares the same mounting footprint and port size (PT1/4) as the SC40. Ensure you match the nominal stroke (75 mm), and note the SCJ body is slightly longer to house the adjusting screw. This model also requires space for the TC trunnion pivot.
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