Airtac SCJ40 Standard Cylinder SCJ40X50-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-30
The SCJ40X50-30 brings field-adjustable stroke control to the 40 mm bore class, delivering 628 N of push force at 0.5 MPa and up to 1130 N at the maximum operating pressure of 0.9 MPa. Its rear-cap adjusting screw provides a 30 mm range to fine-tune the stroke end position, making it ideal for commissioning tweaks or format changeovers without swapping the cylinder. The 16 mm piston rod and PT1/4 ports supply ample flow for speeds up to 800 mm/s.
This double-acting, single-rod cylinder uses an adjustable air cushion (21 mm length) to decelerate the piston smoothly at end of travel. The body length A is 185 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. Standard TPU seals and PT threads are fitted, and the tie-rod construction keeps service straightforward.
Airtac SCJ40 Standard Cylinder SCJ40X50-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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.
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 SCJ40X50-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X50-30 Is Used
Commissioning & Setup
The 30 mm adjust range lets technicians fine-tune the actuator end position on a new assembly line without fabricating shims or mechanical hard stops, speeding up machine runoff.
Product Format Changeover
On a packaging machine, quickly reset the pusher stroke for a different carton size by turning the rear screw, avoiding downtime for cylinder swaps or reprogramming servo axes.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can take up slack as tooling or gripper pads wear over time, maintaining consistent contact force without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-30 the Right Cylinder?
Choose the SCJ40X50-30 when you need to dial in a precise end stop on the machine. If 628 N of push force is marginal, stepping up to the 50 mm bore (SCJ50) provides 982 N at the same 0.5 MPa. For applications that do not require stroke adjustability, the fixed-stroke SC40 is a simpler, slightly shorter alternative. When replacing an existing unit, match the 40 mm bore, 50 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting style. For strokes of 300 mm or more in this bore, consider an external guide rail to protect the 16 mm rod from side loads and prevent bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X50-30 FAQ
At 0.5 MPa, it delivers 628 N pushing and 528 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The pull force is lower because the single rod reduces the effective piston area on the return stroke.
Yes, provided the 30 mm rear protrusion for the adjusting screw fits your mounting envelope. The SCJ shares the same mounting accessories (FA, LB, TC) and porting as the SC40. Ensure the nominal stroke and adjust range match your required travel envelope.
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