Airtac SCJ40 Standard Cylinder SCJ40X350-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke350 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X350-50
The SCJ40X350-50 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 350 mm stroke, featuring a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. This allows precise mechanical tuning of the piston stop position without altering the cylinder mounting or plumbing, delivering 628 N of push force and 528 N of pull force at 0.5 MPa.
With a 16 mm diameter piston rod, PT1/4 ports, and a standard M12x1.25 rod-end thread, this model includes a 21 mm air cushion for smooth deceleration. The SCJ body length A is 185 mm, making it a compact solution for applications where the final stroke length must be dialed in during commissioning or format changeovers.
Airtac SCJ40 Standard Cylinder SCJ40X350-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 50 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X350-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X350-50 Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine bring-up without swapping cylinders. The 50 mm adjustment range lets technicians fine-tune the stop point for gripper closure or part ejection.
Format Changeovers
Quickly adapt stroke length for different product sizes on packaging or assembly lines. Adjust the rear screw to match new box heights or pallet dimensions without mechanical redesign.
Wear Compensation
Take up mechanical wear in linkages or tooling over time by advancing the stroke end. The SCJ40X350-50 maintains consistent actuator positioning without replacing the cylinder or adding shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X350-50 the Right Cylinder?
Step up to a 50 mm bore (SCJ50, 982 N push at 0.5 MPa) if the 628 N output of this 40 mm model is marginal for the load. For fixed-stroke applications where adjustability is not required, the standard SC40X350 cylinder is a simpler, cost-effective alternative. This SCJ40X350-50 replaces any AirTAC SCJ40 adjustable-stroke cylinder with the same 350 mm nominal stroke, 50 mm adjust range, PT ports, and basic mounting.
At a 350 mm stroke, side loading on the 16 mm rod can cause deflection; ensure the load is guided externally or consider a guided cylinder if the rod must support a cantilevered mass. The rear adjusting screw sets the stroke end position only and does not function as a positive stop for high-cycle impact loads.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X350-50 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A screw in the rear cap limits how far the piston can retract, shortening the stroke end by up to 50 mm from the nominal 350 mm. This is a mechanical stroke-end adjustment, not a speed or force control. It allows on-machine tuning without removing the cylinder.
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