The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-20 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X120-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 20 mm field-adjustable stroke range. This allows you to fine-tune the stroke end position without swapping the cylinder, ideal for commissioning and format changes. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, operating smoothly on filtered air up to 1.0 MPa.
This tie-rod cylinder features a PT1/4 port, M12x1.25 rod thread, and an adjustable air cushion of 21 mm for reliable end-of-stroke deceleration. The body length A(SCJ) is 185 mm, making it a compact yet robust solution for applications requiring precise, repeatable stroke adjustment within a 120 mm nominal maximum.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 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. |
| ×120 | 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 end-stop position during machine commissioning without needing to swap out cylinders or fabricate external hard stops, saving significant setup time.
Quickly adjust the stroke for different product sizes on packaging or sorting lines. The 20 mm adjustment range handles minor format variations without mechanical changes.
Compensate for tooling or gripper wear over time by slightly extending the stroke end, maintaining precise part contact and process consistency.
Choose the SCJ40X120-20 when your application requires a 40 mm bore with the ability to dial in the stroke end by up to 20 mm. If you need more force, stepping up to the SCJ50 bore provides 982 N of push force at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This model is a direct replacement for any AirTAC SCJ40X120-20 with PT ports and basic mounting. For strokes of 120 mm, side-loading is generally manageable, but ensure the rod is aligned with the load to prevent premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force. The pull force is 528 N due to the 16 mm rod reducing the effective piston area on the retract stroke.
Yes, the SCJ40X120-20 has the same mounting footprint and port size (PT1/4) as the SC series but adds a rear adjusting screw. It is a direct dimensional replacement when you need the added benefit of field-adjustable stroke, provided the 20 mm adjustment range is sufficient.
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