Airtac SCJ40 Standard Cylinder SCJ40X30-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X30-30S 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, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke30 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X30-30S
The SCJ40X30-30S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 30 mm. This 40 mm bore unit delivers 628 N of push force at 0.5 MPa, making it a strong choice for compact machines where the end-stop needs to be dialled in precisely during commissioning or changeover.
Built with a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion, it operates smoothly across a 30-800 mm/s speed range. The integrated magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection, eliminating the need for external switch brackets.
Airtac SCJ40 Standard Cylinder SCJ40X30-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X30-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 30 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 SCJ40X30-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SCJ40X30-30S Is Used
Commissioning & Setup
Field-adjust the 30 mm stroke end to fine-tune actuator travel during machine commissioning, eliminating the need to machine custom end-stops or swap cylinders.
Wear Compensation
In high-cycle clamping or pressing fixtures, the rear screw takes up pad or tooling wear over time, maintaining consistent contact without reprogramming the controller.
Format Changeover
Quickly adjust the stop position for different product sizes on a packaging line. The built-in magnet provides sensor feedback to confirm the new position is reached.
Is the Airtac SCJ40 Standard Cylinder SCJ40X30-30S the Right Cylinder?
Step up to a 50 mm bore SCJ if your application needs more push force (982 N at 0.5 MPa), or down to a 32 mm bore (402 N) if space is tighter. Choose this SCJ adjustable-stroke model when you need to vary the stroke end on the machine without swapping cylinders; if your stroke is fixed and you never need to adjust it, the standard SC series offers a simpler, lower-cost alternative.
For a direct replacement, match the 40 mm bore, 30 mm nominal stroke, 30 mm adjustment range, PT port thread, and the -S magnet option. This cylinder uses basic mounting; add an FA front flange or LB foot bracket if panel or surface mounting is required.
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 SCJ40X30-30S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. Because it is a single-rod cylinder, the push force (full bore area) is greater than the pull force (rod-side area). At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
A rear-cap screw sets the stroke end position within a 30 mm range, allowing you to shorten the 30 mm nominal stroke without changing the cylinder. Use the SCJ when you need to fine-tune the end-stop on the machine (e.g., for different tooling or wear take-up). Choose a fixed-stroke SC cylinder if the travel distance is permanent and never needs adjustment.
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