The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-30 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X40-30 provides a 40 mm nominal stroke with a 30 mm rear-end adjustment range, letting you fine-tune the stroke end position on the machine without swapping the cylinder. Its 16 mm piston rod and PT1/4 ports deliver a push force of 628 N at 0.5 MPa, making it a solid choice for compact automation tasks that need a quick, field-adjustable end stop.
Built as a double-acting, single-rod tie-rod cylinder with an adjustable rear screw, this unit uses the same mounting accessories as the SC series (FA, LB, TC) but omits flange FB and clevis CA/CB. The 21 mm air cushion at each end decelerates the piston smoothly, and the standard TPU seals handle -20 to +70 °C. For position sensing, add the -S magnet option and clamp a CMSG/DMSG sensor to the barrel.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Fine-tune the end-of-stroke position during machine commissioning without fabricating custom hard stops. The 30 mm screw adjustment lets technicians dial in the exact stopping point for a 40 mm stroke actuator.
Quickly adjust a stop gate or pusher stroke on a small packaging line when switching between product sizes. The rear screw is accessible even when the cylinder is mounted, reducing changeover time.
Compensate for tooling or gripper pad wear over time by slightly extending the effective stroke with the adjusting screw, maintaining consistent contact pressure without replacing the cylinder.
Choose the SCJ40 when you need to dial in a precise stroke end during commissioning or changeovers—the 30 mm adjustment range on this 40 mm nominal stroke is ideal for fine-tuning gripper close points or ejector stops. If you need more force, step up to the SCJ50, which delivers 982 N push at 0.5 MPa; for a lighter, more compact solution, the SCJ32 offers 402 N.
When a fixed stroke is sufficient and the adjustment screw isn't needed, the standard SC40 is a simpler, slightly shorter alternative. For replacement, match an AirTAC SCJ adjustable-stroke cylinder with 40 mm bore, 40 mm nominal stroke, a 30 mm adjust range, PT ports, and the same mounting style (basic, FA, LB, or TC).
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
The rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm from the 40 mm nominal maximum. Pick the SCJ when you need to fine-tune the stroke position on the machine—for commissioning, format changes, or wear compensation. Choose the fixed-stroke SC40 if your stroke length is fixed and you don't need field adjustability.
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