The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X180-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 180mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X180-20S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw, offering a 20 mm field-adjustable stroke range on a 180 mm nominal stroke. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, making it well-suited for end-stop fine-tuning in compact machinery. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable position feedback without extra brackets.
This tie-rod cylinder uses a 16 mm rod, PT1/4 ports, and an M12x1.25 rod thread. The adjustable screw shortens the stroke end, allowing operators to dial in precise stopping positions during commissioning or format changes. With a body length A(SCJ) of 185 mm and a 21 mm air cushion, it provides smooth deceleration and consistent performance across its 30-800 mm/s speed range.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X180-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 180 mm |
| Stroke adjustment | Up to 20 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. |
| ×180 | Nominal (maximum) stroke length in mm. |
| -20 | 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 stroke end position during machine commissioning without removing the cylinder. The 20 mm adjustment range allows rapid optimization of actuator travel.
Quickly adapt stroke length for different product sizes on packaging or assembly lines. The rear screw adjustment eliminates the need for mechanical stops or cylinder swaps.
The built-in magnet pairs directly with CMSG/DMSG sensors to provide precise end-of-stroke detection, simplifying control system integration for pick-and-place or sorting tasks.
Choose the SCJ40X180-20S when you need to fine-tune the stroke end position on the machine without swapping cylinders. If your force requirement is lower, step down to the 32 mm bore (402 N push at 0.5 MPa); for higher force, the 50 mm bore provides 982 N push. This model is ideal where sensor feedback is required, thanks to the integrated magnet. For a fixed-stroke application without adjustment, consider the standard SC series. A direct replacement must match the 40 mm bore, 180 mm nominal stroke, 20 mm adjust range, PT ports, and the -S magnet option.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (due to the 16 mm 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.
Yes, if the mounting and porting match. The SCJ body is slightly longer than an SC of the same bore and stroke to accommodate the adjusting screw. Ensure your machine has clearance for the rear screw mechanism and confirm the 40 mm bore, 180 mm stroke, and PT1/4 ports align with your existing setup.
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