The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-40 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X40-40 is a double-acting, single-rod cylinder that puts field-adjustable stroke control into a 40 mm bore package. The rear-cap screw lets you shorten the stroke end by up to 40 mm, so you can dial in the exact stop position during commissioning or format changes without swapping the cylinder. Its 16 mm piston rod and PT1/4 ports deliver 628 N of push force at 0.5 MPa, rising to 1130 N at the 0.9 MPa maximum operating pressure.
This model uses the standard TPU seal for -20 to +70 °C operation and an adjustable air cushion to decelerate the piston smoothly. The body length A is 185 mm, making it a compact choice for machinery where space is tight but stroke fine-tuning is essential. It accepts the SCJ mounting subset: basic, FA front flange, LB foot, or TC centre trunnion with the TCM1 bracket.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Set the exact end-of-stroke position during machine setup. The 40 mm adjustment range lets technicians compensate for assembly tolerances without machining custom spacers.
Quickly adapt the cylinder stroke for different product sizes on a packaging line. The rear screw adjustment is faster than swapping out a fixed-stroke cylinder for each format.
Compensate for gradual wear in gripper jaws or tooling over time. The adjustable stroke end can be tweaked to restore precise positioning without replacing the actuator.
Choose the SCJ40X40-40 when you need to fine-tune a short stroke on the machine without adding external hard stops. If your force requirement grows, the 50 mm bore SCJ50 series provides 982 N push at 0.5 MPa. For applications that do not need stroke adjustment, a fixed-stroke SC40 cylinder is a simpler, lower-cost alternative. When replacing this unit, match the 40 mm bore, 40 mm nominal stroke, 40 mm adjust range, PT port thread, and the same SCJ mounting accessory to ensure identical fit and performance.
Adjustable-stroke checklist
At 0.5 MPa air pressure, the cylinder produces 628 N of push force and 528 N of pull force. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The pull force is lower because the 16 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the adjustable stroke feature. The SCJ shares the same bore, rod, port, and mounting accessories as the SC series. However, the SCJ body is slightly longer to house the adjusting screw, so check your available space. The adjustable range is 40 mm, meaning you can shorten the nominal 40 mm stroke down to zero.
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