The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-30S 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X70-30S delivers a push force of 628 N at 0.5 MPa, making it a capable actuator for medium-duty positioning tasks where the stroke end needs field tuning. Its 30 mm rear-screw adjustment range lets you dial in the exact stopping point without swapping the cylinder, which is especially useful during commissioning or format changes.
This model includes a built-in magnet, so you can directly clamp CMSG/DMSG/EMSG sensors onto the tie-rod barrel for reliable, non-contact position feedback. The 16 mm diameter piston rod and PT1/4 porting provide a robust mechanical connection, while the 21 mm air cushion at each end ensures smooth deceleration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 70 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. |
| ×70 | 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.
Ideal for machine builders who need to fine-tune a cylinder's end stop during initial setup. The 30 mm adjustment screw allows precise positioning of tooling or stops without mechanical rework.
On packaging or assembly lines, quickly adjust the stroke end to accommodate different product sizes. The SCJ40X70-30S lets operators switch formats in minutes by turning a single screw.
In clamping or pressing applications, use the adjustable stroke to take up mechanical wear on pads or tooling over time, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ40 when you need a compact adjustable-stroke cylinder with 628 N of push force at 0.5 MPa. If your application demands more power, stepping up to the 50 mm bore provides 982 N. For fixed-stroke applications without the need for field adjustment, the standard SC series is a more economical choice. This model is a direct replacement for any AirTAC SCJ40X70-30S with PT ports and a magnet. For strokes over 300 mm in this bore size, consider an external guide to protect the 16 mm rod from side loads.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force.
A rear-cap screw lets you shorten the stroke end by up to 30 mm from the nominal 70 mm maximum. Pick the SCJ when you need to fine-tune the stopping position in the field for setup, changeover, or wear take-up. If your stroke is fixed and never needs adjustment, the standard SC cylinder is a simpler, cost-effective alternative.
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