The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-20S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X350-20S is a 40 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, giving you a 20 mm adjustment range on the 350 mm nominal stroke. It delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa, making it a capable mid-range actuator. The built-in magnet allows for direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback.
This model uses a 16 mm diameter piston rod and PT1/4 inch ports, with an adjustable air cushion to decelerate the piston smoothly. The SCJ body length A is 185 mm, slightly longer than a fixed-stroke SC of the same bore to house the rear adjusting screw. It operates on 40 µm filtered air within a standard pressure range of 0.15-1.0 MPa and a temperature range of -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
The 20 mm rear adjustment screw lets technicians dial in the exact stroke end position on a new machine without fabricating custom hard stops, speeding up initial setup and debugging.
On a packaging line switching between box sizes, the adjustable stroke allows operators to quickly reposition a pusher or stop gate by 20 mm to accommodate a different product format.
In a clamping or pressing fixture, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force without replacing parts.
Select the SCJ40X350-20S when you need to fine-tune the stroke end position during commissioning or product changeovers without swapping the cylinder. If the 628 N push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore SCJ provides 982 N. For applications where the stroke is fixed and never needs field adjustment, the standard SC series is a more economical choice. A direct replacement must match the 40 mm bore, 350 mm nominal stroke, 20 mm adjustable range, PT ports, and the built-in magnet.
At a 350 mm stroke, be mindful of side loads on the 16 mm rod. If the load is not guided and applies a lateral force, rod bending or premature seal wear can occur. In such cases, use an external guide rail or consider a guided cylinder to absorb the side load and protect the actuator.
Adjustable-stroke checklist
A screw mechanism in the rear cap allows you to shorten the stroke end position by up to 20 mm. The 350 mm in the model code is the maximum nominal stroke; turning the screw moves the piston's stopping point inward, effectively giving you an adjustable stroke range from 330 mm to 350 mm.
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf. The pull force is lower because the rod reduces the effective piston area on the return stroke.
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