Airtac SCJ40 Standard Cylinder SCJ40X400-30STC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-30STC 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 SCJ40X400-30STC
The SCJ40X400-30STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the piston's stop position within a 30 mm range without removing the cylinder from the machine. Built on a 40 mm bore with a 16 mm diameter piston rod and PT1/4 ports, it delivers 628 N of push force at 0.5 MPa, making it a strong choice for medium-duty positioning and clamping tasks where commissioning or format changes demand precise end-point calibration.
This model comes configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion mount (TC) including the TCM1 bracket (F-SC40TC) for pivoting applications. The tie-rod construction is robust and serviceable, with an adjustable air cushion to decelerate the 400 mm stroke smoothly. Its body length A(SCJ) is 185 mm plus stroke, slightly longer than a fixed-stroke SC to house the rear adjusting screw.
Airtac SCJ40 Standard Cylinder SCJ40X400-30STC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-30STC |
|---|---|
| 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 SCJ40X400-30STC
| 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 SCJ40X400-30STC Is Used
Multi-Format Packaging
Adjust the push stroke end by up to 30 mm to accommodate different box or carton sizes on a packaging line without changing the cylinder or adding mechanical stops.
Clamp Stroke Wear Compensation
Fine-tune the clamping position as gripper pads or tooling wear down over time, maintaining consistent clamping force without reprogramming the machine controller.
Pivoting Diverter Gate
The centre trunnion mount allows the cylinder to pivot, and the 30 mm stroke adjustment precisely sets the gate angle for diverting products on a conveyor.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-30STC the Right Cylinder?
Choose the SCJ40X400-30STC when your application requires a 400 mm nominal stroke with the ability to shorten the end position by up to 30 mm on the fly—ideal for wear take-up or multi-format tooling. If 628 N of push force is insufficient, stepping up to a 50 mm bore provides 982 N; if it is excessive, a 32 mm bore delivers 402 N. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler, more cost-effective alternative.
At 400 mm of stroke, be mindful of side-loading on the 16 mm rod; an external guide rail or a switch to a guided cylinder is recommended if the load is not perfectly axial. This SCJ directly replaces another AirTAC SCJ40 cylinder with a 400 mm stroke, 30 mm adjust range, TC mount, magnet, and PT ports. Ensure the replacement matches the exact adjust range and mounting to maintain machine geometry.
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 SCJ40X400-30STC FAQ
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. The force increases to 1130 N push at 0.9 MPa. The pull force is lower due to the area of the 16 mm piston rod.
No. The SCJ is a double-acting cylinder that requires constant air pressure to maintain its position. If air pressure is lost or the valve is centered, the piston will drift. The rear adjusting screw only sets the physical stroke end point and is not a locking device. For mid-stroke holding, you need an external rod lock or a pilot-operated check valve.
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