Airtac SCJ40 Standard Cylinder SCJ40X400-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-30 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-30
The SCJ40X400-30 delivers a field-adjustable stroke end within a 30 mm window, letting you fine-tune the 400 mm nominal stroke without replacing the cylinder. Its 16 mm diameter piston rod and PT1/4 port supply 628 N of push force at 0.5 MPa, making it a capable mid-bore actuator for applications that need commissioning flexibility or format-change tweaks.
This double-acting, single-rod cylinder uses a rear-cap adjusting screw to shorten the stroke end position. With a body length A(SCJ) of 185 mm and a 21 mm air cushion, it handles speeds from 30 to 800 mm/s. The tie-rod construction keeps it serviceable, and the standard TPU seals operate reliably from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X400-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 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 SCJ40X400-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SCJ40X400-30 Is Used
Commissioning & Setup
Dial in the exact stroke end position on a new assembly line using the 30 mm rear screw adjustment, eliminating the need to swap cylinders during trial runs.
Product Format Changeover
Quickly adjust the push-off stroke for different box sizes on a packaging conveyor. The 628 N push force at 0.5 MPa handles a wide range of carton weights.
Wear Take-Up
Compensate for mechanical wear in a clamping fixture over time by advancing the stroke end slightly, maintaining consistent clamp force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-30 the Right Cylinder?
Choose this 40 mm bore when the 32 mm bore’s 402 N push at 0.5 MPa is too light, but the 50 mm bore’s 982 N is overkill for your load. If your application never needs stroke adjustment, the fixed-stroke SC40X400 is a simpler alternative. For a direct replacement, match the 40 mm bore, 400 mm nominal stroke, 30 mm adjust range, PT thread, and basic mounting.
At 400 mm of stroke, the rod is extended significantly. If the load creates any side force, add an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
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 SCJ40X400-30 FAQ
At 0.5 MPa, it delivers 628 N pushing and 528 N pulling. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, if you need the 30 mm stroke-end adjustment. The SCJ40X400-30 shares the same bore, rod size, and port thread as the SC40, but the body is slightly longer to house the adjusting screw. Ensure your mounting space can accommodate the 185 mm body length.
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